feat(ai): enhance AI trace warnings and reason codes system

- Added structured warning system with `AdminAiWarning` type in backend and Flutter
- Implemented detailed reason descriptors with `FlyerReasonDescriptor` for parse and match operations
- Added `legacyWarnings` field to maintain backward compatibility
- Enhanced AI trace service to collect and format warnings with item-level context
- Updated flyer import services to include detailed reason descriptions in responses
- Added Swedish diacritic preservation for cheese variants (Prästost, Herrgårdsost, Grevéost)
- Implemented UTF-8 content validation for AI responses
- Added new reason code definitions in `reason-codes.ts`
- Updated Flutter UI to display structured warnings with severity indicators
- Added error report generation and copy functionality in admin panel
- Added comprehensive test coverage for new warning system and cheese normalization

BREAKING CHANGE: AI trace warnings are now structured objects instead of simple strings

.kilo/plans/1779551030351-witty-engine.md

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+# Plan: Flyerimport - specialtecken, beskrivande felmeddelanden, synlig prompt
+
+## Mål
+Tre sammanhängande förbättringar av flyerimport-pipelinen så att användaren får begripligt feedback och korrekt data:
+
+1. Säkerställ att svenska tecken (ä, å, ö, é) bevaras i produktnamn som "Prästost", "Herrgårdsost", "Grevéost".
+2. Ersätt opaka koder som `parse:ai_parsed` och `match:no_match` med människovänliga svenska förklaringar som beskriver "vad" som hände och "var" det hände.
+3. Visa promptens innehåll (inte bara output) för operatörer/admins och vid behov i importflödet vid varningar.
+
+Allt arbete ska respektera nuvarande arkitektur: NestJS backend (`backend/src/flyer-import`, `backend/src/ai`), Flutter web frontend (`flutter/lib/features/import`, `flutter/lib/features/admin`).
+
+---
+
+## Verifierad nulägesbild (källkodsbevis)
+
+### Specialtecken
+- `ai-flyer-parser.service.ts:189-293` skickar prompt utan diakritiska tecken (skriver "Prastost", "Herrgardsost", "Greveost", "ARLA KO", "ä" undviks medvetet i prompt-instruktionerna). Detta gör att modellen tränas/uppmuntras att returnera namnen utan ä/å/é.
+- `ai-flyer-parser.service.ts:358-364` (`normalizeName`) tar bort allt som inte är `[a-zåäö0-9\s]` men `rawName` skickas vidare som det är, så ä/å bevaras tekniskt om AI returnerar dem.
+- `flyer-normalizer.service.ts:26-30` har en hårdkodad mappning för cheese variants:
+  - `prast: 'Prästost'`
+  - `herrgard: 'Herrgårdsost'`
+  - `greve: 'Greveost'` (saknar `é`! Bör vara `Grevéost`)
+- `flyer-normalizer.service.ts:196-227` (`expandCheeseVariants`) gör `stripDiacritics` på rawName innan den jämför med token-list. Detta funkar för matchning men producerar diakrit-fria varianter om mappningen inte är korrekt.
+- `flyer-normalizer.service.ts:140-146` (`normalizeName`) fungerar med `[a-zåäö0-9\s]` så svenska tecken behålls i normaliserat namn när inputen har dem.
+
+### "parse:ai_parsed" och "match:no_match"
+- Konstanter genereras som "reason codes" i koden:
+  - `ai-flyer-parser.service.ts:354`: `reasonCodes: ['ai_parsed']` - sätts på alla AI-parsade items.
+  - `flyer-import.service.ts:496`: `reasons: ['no_match']` - sätts när inget produktnamn matchar.
+- Reason codes prefixas med `parse:` eller `match:` av `ai-trace.service.ts:435-452` (`collectWarnings`):
+  ```ts
+  warnings.add(`parse:${text}`);
+  warnings.add(`match:${text}`);
+  ```
+- Dessa visas i admin AI-traces-vyn (`admin_ai_panel.dart:355-362`, `_WarningsCard`) och möjligen i import-UI:t via `_buildWarningsPanel` (`flyer_import_tab.dart:497-539`) om `_result.warnings` innehåller dem.
+- Slutsats: koderna är inte fel - de är obegripliga utan översättning.
+
+### Promptens synlighet
+- Admin AI-panelen (`admin_ai_panel.dart:444-508`, `_PromptCard`) visar redan prompt med expand/copy-knappar.
+- Importflödet (`flyer_import_tab.dart`, `receipt_import_tab.dart`) visar idag bara `warnings`-listan. Ingen promptvisning, ingen mappning från reason codes till begripligt språk, ingen länk till AI-trace.
+- AI-trace lagras alltid i DB (`flyer-import.service.ts:148-164`, `persistFlyerTrace`). Promptens innehåll finns alltså redan tillgängligt.
+
+---
+
+## Strategi och faser
+
+Tre paralleliserbara delprojekt med varsin egen fas. Slutlig sammanflätning verifieras med befintliga tester och ny smoke-test.
+
+---
+
+## Fas A: Specialtecken i produktnamn (lågriskfix, hög nytta)
+
+### A1. Korrigera hårdkodad cheese-mappning
+- `backend/src/flyer-import/services/flyer-normalizer.service.ts:26-30`
+  - Ändra `greve: 'Greveost'` till `greve: 'Grevéost'`.
+  - Behåll `prast: 'Prästost'` och `herrgard: 'Herrgårdsost'`.
+
+### A2. Skydda diakritiska tecken hela vägen från AI-svar till klient
+- `backend/src/flyer-import/services/ai-flyer-parser.service.ts`
+  - Säkerställ att Mistralklientens response.choices[0].message.content tolkas som UTF-8. Logga hex-dump i debug-läge om tecken förvanskas.
+  - I `sanitizeJsonResponse`/`normalizeAiItem`: säkerställ att `rawName` inte normaliseras eller stripps innan `normalize`-steget.
+  - Uppdatera prompten:
+    - Lägg till explicit instruktion: `Behåll svenska diakritiska tecken (ä, å, ö, é) i produktnamn. Returnera "Prästost", "Herrgårdsost", "Grevéost" - inte ASCII-versioner.`
+    - Uppdatera exempel-utdata i prompten (rad 256-286) från "Prastost"/"Herrgardsost" till "Prästost"/"Herrgårdsost"/"Grevéost" så modellen tränas att returnera korrekt.
+    - Behåll fortfarande `prast/herrgard/greve` som tokens i instruktion 9 men kräv normalisering till diakrit-versionen i utdatan.
+- `backend/src/flyer-import/services/flyer-normalizer.service.ts`
+  - I `expandCheeseVariants` (rad 196-227): efter `stripDiacritics`-tokenisering, mappa via `CHEESE_VARIANT_TO_NAME` så slutnamnet alltid har korrekta tecken.
+  - I `fixKnownOcrTypos` (rad 250-262): lägg till regel som korrigerar "Greveost" -> "Grevéost" (men bara när det är klart att det är ostnamnet, inte personnamn). Använd kontext: bara om `category` antyder hårdost/ost eller `rawName` slutar på `ost`.
+
+### A3. Säkra Caddy/HTTP-respons för UTF-8
+- Verifiera att `Content-Type: application/json; charset=utf-8` returneras från NestJS (default i `@nestjs/platform-express`, men kontrollera att ingen middleware skriver om).
+- Caddy gör inte byteomvandling som standard, men dubbelkolla att `flutter/Caddyfile` inte har någon `replace`-direktiv (det har det inte i nuläget).
+
+### A4. Test
+- Utöka `flyer-normalizer.service.spec.ts` med:
+  - Test som matar in rawName "PRAST" och kontrollerar att outputens rawName blir "Prästost" (inte "Prastost").
+  - Test som matar in rawName "GREVE" och kontrollerar att outputens rawName blir "Grevéost".
+  - Test som verifierar att `é`-tecken bevaras i hela pipen.
+- Snapshot-test för prompten i `ai-flyer-parser.service.spec.ts` så att ändringar i prompten är medvetna.
+
+### Acceptanskriterier Fas A
+- En flyer som innehåller "PRAST, HERRGARD, GREVE" producerar rader med rawName `Prästost`, `Herrgårdsost`, `Grevéost`.
+- Ingen befintlig test går sönder.
+- UI:t (Flutter) visar de korrekta tecknen utan encoding-artifacts.
+
+### Risker
+- Mistral kan ignorera diakritiska tecken i instruktioner. Motåtgärd: post-normalisering i `flyer-normalizer.service.ts` är hårda fallback-regeln.
+
+---
+
+## Fas B: Beskrivande felmeddelanden ersätter `parse:ai_parsed` och `match:no_match`
+
+### B1. Centraliserad reason-code-katalog (backend)
+- Skapa `backend/src/flyer-import/services/reason-codes.ts` (eller `backend/src/ai/reason-codes.ts` om det är delat med receipt) som exporterar:
+  - `ParseReasonCode = 'ai_parsed' | 'split_cheese_variants' | 'normalized' | 'low_confidence' | ...`
+  - `MatchReasonCode = 'no_match' | 'alias_exact' | 'normalized_exact' | 'token_overlap' | 'alias_points_to_missing_product' | 'empty_name'`
+  - Funktion `describeParseReason(code, context?): { title, message, severity, location? }`
+  - Funktion `describeMatchReason(code, context?): { title, message, severity }`
+- Exempelmappning:
+  - `ai_parsed` -> `severity: 'info', title: 'AI-tolkad rad', message: 'Raden tolkades av AI utan att en deterministisk regel matchade.'`
+  - `split_cheese_variants` -> `severity: 'info', title: 'Variant-split', message: 'AI-svarade en gruppannons som expanderades till individuella ostvarianter.'`
+  - `low_confidence` -> `severity: 'warning', title: 'Låg parsningskvalitet', message: 'Modellens säkerhet är låg, granska raden manuellt.'`
+  - `no_match` -> `severity: 'warning', title: 'Ingen produktmatchning', message: 'Vi kunde inte hitta någon befintlig produkt som matchar texten på flyern.'`
+  - `alias_points_to_missing_product` -> `severity: 'error', title: 'Trasig alias-koppling', message: 'Ett alias pekar på en produkt som inte längre finns.'`
+  - `empty_name` -> `severity: 'error', title: 'Tomt produktnamn', message: 'Raden saknar tolkbart produktnamn.'`
+- Inkludera `location` när relevant: t ex `'Steg: AI-parser, chunk N/M'` eller `'Steg: matchning mot dina produkter'`.
+
+### B2. Returnera strukturerade reasons i API
+- Utöka `backend/src/flyer-import/dto/flyer-import.response.ts`:
+  ```ts
+  export type FlyerReasonDescriptor = {
+    code: string;             // 'ai_parsed', 'no_match', ...
+    kind: 'parse' | 'match';
+    title: string;            // Människovänlig titel
+    message: string;          // Förklarande text
+    severity: 'info' | 'warning' | 'error';
+    location: string | null;  // T ex 'Steg: matchning mot dina produkter'
+  };
+  ```
+- Lägg till på `FlyerImportItem`:
+  - `parseReasonsDetailed: FlyerReasonDescriptor[]`
+  - `matchReasonsDetailed: FlyerReasonDescriptor[]`
+  - Behåll befintliga `parseReasons: string[]` och `matchReasons: string[]` för bakåtkompatibilitet.
+- I `flyer-import.service.ts:110-144` (där `FlyerImportItem` byggs): mappa via `describeParseReason`/`describeMatchReason`.
+- Detsamma för session-läs-paths (`toFlyerImportItem` rad 721-799 och `toFlyerImportResponseFromSession`).
+
+### B3. Uppdatera AI-trace warnings (admin)
+- `backend/src/ai/ai-trace.service.ts:435-452` (`collectWarnings`):
+  - Ändra till att returnera strukturerade objekt istället för `parse:xxx`/`match:xxx`-strängar:
+    ```ts
+    type AdminAiWarning = {
+      code: string;
+      kind: 'parse' | 'match';
+      title: string;
+      message: string;
+      severity: 'info' | 'warning' | 'error';
+      itemIndex?: number; // Pekar på vilken rad i sessionen
+    };
+    ```
+  - Uppdatera `AdminAiTraceDetail.warnings` schema till strukturerat format.
+  - Bibehåll en `legacyWarnings: string[]` med gamla formatet ifall någon klient ännu inte uppdaterats.
+
+### B4. Uppdatera Flutter-modeller och vyer
+- `flutter/lib/features/import/domain/flyer_import_item.dart`:
+  - Lägg till `parseReasonsDetailed: List<FlyerReasonDescriptor>` och `matchReasonsDetailed: List<FlyerReasonDescriptor>` med `fromJson`/`toJson`.
+- Skapa `flutter/lib/features/import/domain/flyer_reason_descriptor.dart`:
+  - `class FlyerReasonDescriptor { final String code; final String kind; final String title; final String message; final String severity; final String? location; ... }`
+- `flutter/lib/features/import/presentation/flyer_import_tab.dart`:
+  - I `_buildWarningsPanel` (rad 497-539): visa enbart sessionens egentliga warnings (existerande) men gör dem klickbara så de kan kopieras.
+  - Per rad: visa en summerande badge "X varningar" som expanderar till en lista med titel + message istället för tekniska koder. Använd ikoner per severity (info/warning/error).
+  - Behåll befintlig kvalitetsbadge (Hög/Medel/Låg).
+- `flutter/lib/features/admin/presentation/admin_ai_panel.dart`:
+  - `_WarningsCard` (rad 583+): byt ut SelectableText med rå-strängar mot strukturerad rendering: titel (fet), message (vanlig), severity-färg, eventuellt itemIndex som länk.
+  - Behåll copy-funktion - kopierar då en formaterad sträng `"[severity] title: message"`.
+
+### B5. Test
+- Backend: enhetstest för `describeParseReason`/`describeMatchReason` som täcker alla codes.
+- Backend: integrationstest som verifierar att `FlyerImportResponse` innehåller `parseReasonsDetailed` med rätt fält.
+- Flutter: widget-test för warnings-panel som verifierar att `parse:ai_parsed` ALDRIG visas, utan ersätts av "AI-tolkad rad".
+- Uppdatera `flutter/test/features/admin/presentation/admin_ai_panel_test.dart` som idag verifierar `find.text('parse:low_confidence')` - testet ska istället leta efter "Låg parsningskvalitet".
+
+### Acceptanskriterier Fas B
+- Inga `parse:xxx`- eller `match:xxx`-strängar visas i UI:t (varken admin eller import).
+- Varje warning har: titel, beskrivande text, severity-ikon, och om relevant en location ("Steg: ...").
+- API:et returnerar både legacy- och nytt format, så ingen klient bryts.
+
+### Risker
+- Översättning av code -> human text måste hållas i sync mellan backend och Flutter. Motåtgärd: sätt textmappningen ENBART i backend och returnera färdig string. Flutter renderar bara.
+
+---
+
+## Fas C: Synlig prompt i import-flödet och vid varningar
+
+### C1. Bestäm synlighetspolicy
+- Operatörer/admins ska kunna se prompten direkt i admin AI-panelen (finns redan, fortsätter fungera).
+- Vanliga användare ska kunna se prompten **efter behov** för att felsöka eller rapportera fel - men inte by default eftersom prompten är teknisk.
+- Föreslagen UX: när en rad har varningar (parse eller match), visa knapp "Visa AI-detaljer" som öppnar modal med:
+  - Använd modell + retry/chunk-info
+  - Prompten (expanderbar)
+  - AI-svar (raw output, expanderbar)
+  - Lista över alla parse/match-reasons med deras `describeXxxReason`-output
+- Promptvisning i adminpanelen redan komplett (`_PromptCard`) - bara verifiera att det fortsätter funka efter Fas B.
+
+### C2. Backend-ändringar
+- Ny endpoint `GET /api/flyer-import/sessions/:sessionId/ai-trace` som returnerar:
+  ```ts
+  {
+    sessionId: number;
+    model: string;
+    prompt: string;
+    rawOutput: string;
+    chunkCount: number | null;
+    retryCount: number | null;
+    durationMs: number | null;
+    status: 'success' | 'warning' | 'error';
+    warnings: AdminAiWarning[];
+  }
+  ```
+- Återanvänd existerande `aiTrace`-tabellen. Auth: kräv att `userId` ägar sessionen (samma policy som `getSessionSource`).
+- Eventuellt feature-flagga visa-prompt-för-användare (`FLYER_AI_USER_PROMPT_VISIBLE` env). Default: `true` för admin, `true` för användare som äger sessionen.
+
+### C3. Flutter-ändringar
+- `flutter/lib/features/import/data/import_repository.dart`: ny metod `getFlyerSessionAiTrace(sessionId, token)`.
+- `flutter/lib/features/import/domain/`: ny modell `FlyerAiTrace`.
+- `flutter/lib/features/import/presentation/flyer_import_tab.dart`:
+  - Lägg till en "AI-detaljer"-knapp i headern (efter Importera-knappen) eller i varje rads expanderingspanel.
+  - Visa prompt + rawOutput i en modal/expanderbar Card med samma look-and-feel som admin (`_PromptCard` + `_OutputJsonCard` kan extraheras till delad widget under `flutter/lib/features/import/presentation/widgets/ai_trace_view.dart`).
+- Lägg till samma åtgärd för `receipt_import_tab.dart` om motsvarande backend-stöd finns (det finns - receipts har också AI-trace).
+
+### C4. Säkerhet och PII
+- Innan prompt visas till slutanvändare: kör `maskSensitiveText` (finns redan i `ai-trace.service.ts`).
+- Alla loggade prompts/rawOutputs ska redan vara maskerade i nuvarande pipeline. Verifiera att det fortsätter gälla.
+
+### C5. Test
+- Backend: e2e-test för nya endpointen, inklusive 403 för icke-ägare och 200 för ägare.
+- Flutter: widget-test för att modalen öppnas och visar prompten.
+- Manuell QA: Importera en flyer, klicka "AI-detaljer", verifiera att prompten visas och att kopiera-knappen fungerar.
+
+### Acceptanskriterier Fas C
+- Användare kan se prompten som skickades vid sin egen flyerimport.
+- Adminpanelen visar fortfarande prompten oförändrat.
+- PII-mask appliceras innan prompten skickas till klienten.
+
+### Risker
+- Prompten är lång (>5000 tecken). Motåtgärd: använd existerande expand/collapse-mönster (`_PromptCard.expanded`).
+- Prompten kan innehålla användardata. Motåtgärd: maskning + tydlig "Detta innehåller text från din flyer"-disclaimer.
+
+---
+
+## Prioriterad genomförandeordning
+1. **Fas A** (specialtecken) - lågrisk, snabb seger för UX.
+2. **Fas B** (mänskliga felmeddelanden) - medelarbete, hög UX-impact.
+3. **Fas C** (prompt-synlighet) - mer komplex pga ny endpoint + UI, men oberoende av A och B.
+
+Faserna kan implementeras i parallella PR:er om så önskas; Fas A och B berör delvis samma kodvägar i `flyer-normalizer.service.ts` och `flyer-import.service.ts`, och bör samordnas så att en PR mergas före nästa.
+
+---
+
+## Definition of Done
+- "Prästost", "Herrgårdsost", "Grevéost" och `é`/`å`/`ä` syns korrekt i flyerimport-UI.
+- Inga råa `parse:ai_parsed`/`match:no_match`-strängar visas för användare eller admin.
+- Användare och admin kan se vilken prompt som skickades till AI.
+- Befintliga tester passerar; nya tester täcker varje fas separat.
+- Inga regressioner i Docker-bygget (`backend/Dockerfile` kör `npm test -- --runInBand`).
+
+---
+
+## Konkreta filer som berörs
+
+Backend:
+- `backend/src/flyer-import/services/flyer-normalizer.service.ts` (Fas A)
+- `backend/src/flyer-import/services/ai-flyer-parser.service.ts` (Fas A, eventuellt B)
+- `backend/src/flyer-import/services/reason-codes.ts` (ny, Fas B)
+- `backend/src/flyer-import/dto/flyer-import.response.ts` (Fas B)
+- `backend/src/flyer-import/flyer-import.service.ts` (Fas B, Fas C)
+- `backend/src/flyer-import/flyer-import.controller.ts` (Fas C, ny endpoint)
+- `backend/src/ai/ai-trace.service.ts` (Fas B)
+- `backend/src/flyer-import/services/flyer-normalizer.service.spec.ts` (Fas A)
+- `backend/src/flyer-import/services/ai-flyer-parser.service.spec.ts` (Fas A, B)
+
+Flutter:
+- `flutter/lib/features/import/domain/flyer_import_item.dart` (Fas B)
+- `flutter/lib/features/import/domain/flyer_reason_descriptor.dart` (ny, Fas B)
+- `flutter/lib/features/import/domain/flyer_ai_trace.dart` (ny, Fas C)
+- `flutter/lib/features/import/data/import_repository.dart` (Fas C)
+- `flutter/lib/features/import/presentation/flyer_import_tab.dart` (Fas A-C)
+- `flutter/lib/features/import/presentation/widgets/ai_trace_view.dart` (ny, Fas C)
+- `flutter/lib/features/admin/domain/admin_ai_trace_detail.dart` (Fas B)
+- `flutter/lib/features/admin/presentation/admin_ai_panel.dart` (Fas B)
+- `flutter/test/features/admin/presentation/admin_ai_panel_test.dart` (Fas B)
+
+---
+
+## Riskanalys och rollback
+
+| Risk | Sannolikhet | Motåtgärd |
+| --- | --- | --- |
+| Mistral returnerar fortfarande ASCII-versioner | Medel | Hård post-normalisering i `flyer-normalizer.service.ts` (Fas A2) |
+| Strukturerade reasons bryter befintlig admin-vy | Låg | Behåll legacy-format parallellt under en release |
+| Promptens längd försämrar mobil-UX | Låg | Default collapsed med expand-knapp |
+| AI-trace exponerar PII oavsiktligt | Medel | Återanvänd befintlig `maskSensitiveText` + tydlig disclaimer |
+| Ändrade reason codes bryter andra konsumenter (t ex flyer-selection-matcher) | Låg | Sökning visar att `reasonCodes` används endast i flyer-import + ai-trace; uppdatera samtliga callsites i samma PR |
+
+---
+
+## Beslut tagna med dig
+
+1. **Promptens synlighet**: endast admin. Vanliga användare ser inte prompten - bara översatta reasons. Detta förenklar Fas C avsevärt: ingen ny användarendpoint, ingen PII-mask för slutanvändare, ingen ny användar-UI.
+2. **Reason-codes översätts i backend**: backend returnerar färdig svensk text (`title`, `message`) i `FlyerReasonDescriptor`. Frontend renderar bara strängarna utan översättning. Lang-parameter förbereds för framtida flerspråksstöd.
+3. **Kopiera felrapport-knapp**: ja. Lägg till "Kopiera felrapport"-knapp i admin AI-panelens detail-vy som producerar formaterad text:
+   ```
+   [AI-trace flyer-123]
+   Modell: ministral-8b-2512
+   Status: warning (3 varningar)
+   Tid: 2026-05-23T20:12:00
+   
+   Varningar:
+   - [warning] Ingen produktmatchning (rad 5): Vi kunde inte hitta...
+   - [info] AI-tolkad rad (rad 7): Raden tolkades av AI...
+   
+   Prompt:
+   ...
+   
+   Raw output:
+   ...
+   ```
+4. **Stavning**: `Grevéost` med `é` (Arlas officiella stavning).
+
+## Konsekvenser av besluten på faserna
+
+### Fas A (oförändrad)
+- `Grevéost` används i mappningen.
+
+### Fas B (oförändrad)
+- Backend översätter och returnerar färdig svensk text i `title`/`message`.
+- Behåll `code`-fältet så frontend kan filtrera/rendera olika per typ.
+
+### Fas C (förenklad)
+- **Tas bort**: Ny användarendpoint `GET /api/flyer-import/sessions/:id/ai-trace`.
+- **Tas bort**: Ny Flutter-modell `FlyerAiTrace` och repository-metod för användarvy.
+- **Tas bort**: Ny widget `ai_trace_view.dart` för importflödet.
+- **Behålls**: Adminpanelens promptvisning (`_PromptCard`) - finns redan, fungerar.
+- **Läggs till**: "Kopiera felrapport"-knapp i adminpanelens detail-vy. Genererar formaterad text enligt mallen ovan.
+- **Användarflöde uppdateras**: i flyer/receipt-import-tabben visa endast översatta reasons via Fas B; ingen prompt-knapp för användare.
+
+## Uppdaterade konkreta filer (efter beslut)
+
+Backend:
+- `backend/src/flyer-import/services/flyer-normalizer.service.ts` (Fas A)
+- `backend/src/flyer-import/services/ai-flyer-parser.service.ts` (Fas A)
+- `backend/src/flyer-import/services/reason-codes.ts` (ny, Fas B)
+- `backend/src/flyer-import/dto/flyer-import.response.ts` (Fas B)
+- `backend/src/flyer-import/flyer-import.service.ts` (Fas B)
+- `backend/src/ai/ai-trace.service.ts` (Fas B)
+- `backend/src/flyer-import/services/flyer-normalizer.service.spec.ts` (Fas A)
+- `backend/src/flyer-import/services/ai-flyer-parser.service.spec.ts` (Fas A)
+- *Inte längre*: ny endpoint i `flyer-import.controller.ts` (utgår med beslut 1).
+
+Flutter:
+- `flutter/lib/features/import/domain/flyer_import_item.dart` (Fas B)
+- `flutter/lib/features/import/domain/flyer_reason_descriptor.dart` (ny, Fas B)
+- `flutter/lib/features/import/presentation/flyer_import_tab.dart` (Fas A-B)
+- `flutter/lib/features/admin/domain/admin_ai_trace_detail.dart` (Fas B)
+- `flutter/lib/features/admin/presentation/admin_ai_panel.dart` (Fas B + felrapportknapp)
+- `flutter/test/features/admin/presentation/admin_ai_panel_test.dart` (Fas B)
+- *Inte längre*: `flyer_ai_trace.dart`, `ai_trace_view.dart`, repository-metod (utgår med beslut 1).

backend/src/ai/ai-trace.service.spec.ts

@@ -143,6 +143,71 @@ describe('AiTraceService receipt masking', () => {
     expect(result.rawOutput).toContain('{"ok":true}');
     expect(result.retryCount).toBe(2);
     expect(result.chunkCount).toBe(4);
-    expect(result.warnings).toContain('parse:low_confidence');
+    expect(result.warnings).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({
+          kind: 'parse',
+          code: 'low_confidence',
+          title: 'Låg parsningskvalitet',
+          severity: 'warning',
+        }),
+      ]),
+    );
+    expect(result.legacyWarnings).toContain('parse:low_confidence');
+  });
+
+  it('keeps multiple token_overlap warnings for same row', async () => {
+    prismaMock.flyerSession.findUnique.mockResolvedValue({
+      id: 202,
+      userId: 9,
+      createdAt: new Date('2026-05-23T09:00:00.000Z'),
+      sourceFileName: 'willys-v21.pdf',
+      sourceMimeType: 'application/pdf',
+      sourceFileSize: 2222,
+      user: { username: 'admin', email: 'admin@example.com' },
+      items: [
+        {
+          id: 11,
+          rawName: 'Tomatmix',
+          normalizedName: 'tomatmix',
+          brand: null,
+          categoryHint: 'Grönsaker',
+          categoryId: null,
+          price: null,
+          priceUnit: null,
+          comparisonPrice: null,
+          comparisonUnit: null,
+          weight: null,
+          bundleWeight: null,
+          isBundle: false,
+          bundleItems: [],
+          offerText: null,
+          parseConfidence: 0.9,
+          parseReasons: [],
+          matchedProductId: null,
+          matchedProductName: null,
+          matchedVia: 'token',
+          matchConfidence: 0.7,
+          matchReasons: ['token_overlap:0.42', 'token_overlap:0.73'],
+        },
+      ],
+    });
+
+    prismaMock.aiTrace.findMany.mockResolvedValue([
+      {
+        sessionId: 202,
+        prompt: 'prompt',
+        rawOutput: '{"ok":true}',
+        normalizedOutput: { retryCount: 0, chunkCount: 1 },
+      },
+    ]);
+
+    const result = await service.getTraceById('flyer-202');
+
+    const tokenWarnings = result.warnings.filter((warning) => warning.code === 'token_overlap');
+    expect(tokenWarnings).toHaveLength(2);
+    expect(result.legacyWarnings).toEqual(
+      expect.arrayContaining(['match:token_overlap:0.42', 'match:token_overlap:0.73']),
+    );
   });
 });

backend/src/ai/ai-trace.service.ts

@@ -1,5 +1,10 @@
 import { Injectable, NotFoundException } from '@nestjs/common';
 import { PrismaService } from '../prisma/prisma.service';
+import {
+  describeMatchReason,
+  describeParseReason,
+  FlyerReasonDescriptor,
+} from '../flyer-import/services/reason-codes';
 
 export type AiTraceSource = 'receipt' | 'flyer';
 
@@ -45,7 +50,8 @@ export type AiTraceDetail = {
   durationMs: number | null;
   retryCount: number | null;
   chunkCount: number | null;
-  warnings: string[];
+  warnings: AdminAiWarning[];
+  legacyWarnings: string[];
   error: string | null;
   prompt: string | null;
   rawOutput: string | null;
@@ -53,6 +59,10 @@ export type AiTraceDetail = {
   summary: Record<string, unknown>;
 };
 
+export type AdminAiWarning = FlyerReasonDescriptor & {
+  itemIndex?: number;
+};
+
 type FlyerTraceSupplement = {
   prompt: string | null;
   rawOutput: string | null;
@@ -107,11 +117,14 @@ export class AiTraceService {
     const page = hasMore ? sessions.slice(0, take) : sessions;
 
     const items: AiTraceListItem[] = page.map((session) => {
-      const warningsCount = session.items.reduce((sum, item) => {
+      const warningSet = this.collectWarnings(
-        const parseWarnings = Array.isArray(item.parseReasons) ? item.parseReasons.length : 0;
+        session.items.map((item, itemIndex) => ({
-        const matchWarnings = Array.isArray(item.matchReasons) ? item.matchReasons.length : 0;
+          parseReasons: item.parseReasons,
-        return sum + parseWarnings + matchWarnings;
+          matchReasons: item.matchReasons,
-      }, 0);
+          itemIndex,
+        })),
+      );
+      const warningsCount = this.countActionableWarnings(warningSet.warnings);
       const status = this.statusFromSession(session.items.length, warningsCount);
       return {
         id: this.flyerTraceId(session.id),
@@ -205,8 +218,18 @@ export class AiTraceService {
       throw new NotFoundException('AI-trace hittades inte.');
     }
 
-    const warnings = this.collectWarnings(session.items);
+    const warningSet = this.collectWarnings(
-    const status = this.statusFromSession(session.items.length, warnings.length);
+      session.items.map((item, itemIndex) => ({
+        parseReasons: item.parseReasons,
+        matchReasons: item.matchReasons,
+        itemIndex,
+      })),
+    );
+    const warnings = warningSet.warnings;
+    const status = this.statusFromSession(
+      session.items.length,
+      this.countActionableWarnings(warnings),
+    );
     const supplement = await this.getFlyerTraceSupplementBySessionId(session.id);
 
     const normalizedOutput = {
@@ -241,6 +264,7 @@ export class AiTraceService {
         matchReasons: Array.isArray(item.matchReasons) ? item.matchReasons : [],
       })),
       warnings,
+      legacyWarnings: warningSet.legacyWarnings,
     } as Record<string, unknown>;
 
     return {
@@ -257,6 +281,7 @@ export class AiTraceService {
       retryCount: supplement.retryCount,
       chunkCount: supplement.chunkCount,
       warnings,
+      legacyWarnings: warningSet.legacyWarnings,
       error: session.items.length === 0 ? 'Inga produkter kunde extraheras från flyern.' : null,
       prompt: supplement.prompt,
       rawOutput:
@@ -266,7 +291,7 @@ export class AiTraceService {
         source: 'flyer',
         sessionId: session.id,
         itemCount: session.items.length,
-        warningsCount: warnings.length,
+        warningsCount: this.countActionableWarnings(warnings),
         promptAvailable: !!supplement.prompt,
         outputAvailable: true,
         retentionHintDays: 30,
@@ -432,23 +457,58 @@ export class AiTraceService {
     return `user:${userId}`;
   }
 
-  private collectWarnings(items: Array<{ parseReasons: unknown; matchReasons: unknown }>): string[] {
+  private collectWarnings(items: Array<{ parseReasons: unknown; matchReasons: unknown; itemIndex?: number }>): {
-    const warnings = new Set<string>();
+    warnings: AdminAiWarning[];
+    legacyWarnings: string[];
+  } {
+    const warnings: AdminAiWarning[] = [];
+    const legacyWarnings = new Set<string>();
+    const dedupe = new Set<string>();
+
     for (const item of items) {
+      const itemIndex = item.itemIndex != null ? item.itemIndex + 1 : undefined;
+
       if (Array.isArray(item.parseReasons)) {
         for (const reason of item.parseReasons) {
           const text = String(reason ?? '').trim();
-          if (text.length > 0) warnings.add(`parse:${text}`);
+          if (!text) continue;
+          const warning: AdminAiWarning = {
+            ...describeParseReason(text),
+            itemIndex,
+          };
+          const key = `${warning.kind}:${text}:${warning.itemIndex ?? 0}`;
+          if (dedupe.has(key)) continue;
+          dedupe.add(key);
+          warnings.push(warning);
+          legacyWarnings.add(`parse:${text}`);
         }
       }
+
       if (Array.isArray(item.matchReasons)) {
         for (const reason of item.matchReasons) {
           const text = String(reason ?? '').trim();
-          if (text.length > 0) warnings.add(`match:${text}`);
+          if (!text) continue;
+          const warning: AdminAiWarning = {
+            ...describeMatchReason(text),
+            itemIndex,
+          };
+          const key = `${warning.kind}:${text}:${warning.itemIndex ?? 0}`;
+          if (dedupe.has(key)) continue;
+          dedupe.add(key);
+          warnings.push(warning);
+          legacyWarnings.add(`match:${text}`);
         }
       }
     }
-    return Array.from(warnings);
+
+    return {
+      warnings,
+      legacyWarnings: Array.from(legacyWarnings),
+    };
+  }
+
+  private countActionableWarnings(warnings: AdminAiWarning[]): number {
+    return warnings.filter((warning) => warning.severity !== 'info').length;
   }
 
   private async listReceiptTraces(params: {
@@ -553,6 +613,7 @@ export class AiTraceService {
       retryCount: null,
       chunkCount: null,
       warnings: [],
+      legacyWarnings: [],
       error: row.error,
       prompt: row.prompt ? this.maskSensitiveText(row.prompt) : null,
       rawOutput: this.maskRawOutput(row.rawOutput),

backend/src/flyer-import/dto/flyer-import.response.ts

@@ -1,4 +1,13 @@
-export type FlyerImportMatchVia = 'alias' | 'exact' | 'token' | 'none';
+export type FlyerImportMatchVia = 'alias' | 'exact' | 'token' | 'none';
+
+export type FlyerReasonDescriptor = {
+  code: string;
+  kind: 'parse' | 'match';
+  title: string;
+  message: string;
+  severity: 'info' | 'warning' | 'error';
+  location: string | null;
+};
 
 export type FlyerImportItem = {
   flyerItemId: number | null;
@@ -18,14 +27,16 @@ export type FlyerImportItem = {
   offerText: string | null;
   isOffer: boolean;
   offerLimitText: string | null;
-  parseConfidence: number;
+  parseConfidence: number;
-  parseReasons: string[];
+  parseReasons: string[];
-  matchedProductId: number | null;
+  parseReasonsDetailed: FlyerReasonDescriptor[];
-  matchedProductName: string | null;
+  matchedProductId: number | null;
-  matchedVia: FlyerImportMatchVia;
+  matchedProductName: string | null;
-  matchConfidence: number;
+  matchedVia: FlyerImportMatchVia;
-  matchReasons: string[];
+  matchConfidence: number;
-};
+  matchReasons: string[];
+  matchReasonsDetailed: FlyerReasonDescriptor[];
+};
 
 export type FlyerImportResponse = {
   sessionId: number | null;

backend/src/flyer-import/flyer-import.service.spec.ts

@@ -97,6 +97,8 @@ describe('FlyerImportService', () => {
       expect(result.items).toHaveLength(1);
       expect(result.items[0].flyerItemId).toBe(99);
       expect(result.items[0].matchedVia).toBe('exact');
+      expect(result.items[0].parseReasonsDetailed[0].title).toBe('AI-tolkad rad');
+      expect(result.items[0].matchReasonsDetailed[0].title).toBe('Exakt normaliserad matchning');
       expect(result.sourceAvailable).toBe(false);
     });
 

backend/src/flyer-import/flyer-import.service.ts

@@ -9,14 +9,15 @@ import {
 import { Prisma } from '@prisma/client';
 import { PrismaService } from '../prisma/prisma.service';
 import { normalizeName } from '../common/utils/normalize-name';
-import {
+import {
-  FlyerImportItem,
+  FlyerImportItem,
-  FlyerImportMatchVia,
+  FlyerImportMatchVia,
-  FlyerImportResponse,
+  FlyerImportResponse,
-} from './dto/flyer-import.response';
+} from './dto/flyer-import.response';
 import { TextExtractorService } from './services/text-extractor.service';
 import { AiFlyerParserService } from './services/ai-flyer-parser.service';
-import { FlyerNormalizerService } from './services/flyer-normalizer.service';
+import { FlyerNormalizerService } from './services/flyer-normalizer.service';
+import { describeMatchReason, describeParseReason } from './services/reason-codes';
 
 type FlyerParseItem = {
   rawName: string;
@@ -135,13 +136,15 @@ export class FlyerImportService {
         offerLimitText,
         parseConfidence: item.confidence,
         parseReasons: item.reasonCodes,
-        matchedProductId: match.product?.id ?? null,
+        parseReasonsDetailed: this.describeParseReasons(item.reasonCodes),
-        matchedProductName: match.product?.name ?? null,
+        matchedProductId: match.product?.id ?? null,
-        matchedVia: match.via,
+        matchedProductName: match.product?.name ?? null,
-        matchConfidence: match.confidence,
+        matchedVia: match.via,
-        matchReasons: match.reasons,
+        matchConfidence: match.confidence,
-      };
+        matchReasons: match.reasons,
-    });
+        matchReasonsDetailed: this.describeMatchReasons(match.reasons),
+      };
+    });
 
     const persistedItems = await this.persistSessionWithItems(userId, parsed.retailer, items, file);
 
@@ -790,14 +793,24 @@ export class FlyerImportService {
       offerLimitText,
       parseConfidence: item.parseConfidence,
       parseReasons: toStringArray(item.parseReasons),
+      parseReasonsDetailed: this.describeParseReasons(toStringArray(item.parseReasons)),
       matchedProductId: item.matchedProductId,
       matchedProductName: item.matchedProductName,
       matchedVia: normalizedMatchVia,
       matchConfidence: item.matchConfidence ?? 0,
       matchReasons: toStringArray(item.matchReasons),
+      matchReasonsDetailed: this.describeMatchReasons(toStringArray(item.matchReasons)),
     };
   }
 
+  private describeParseReasons(codes: string[]) {
+    return codes.map((code) => describeParseReason(code));
+  }
+
+  private describeMatchReasons(codes: string[]) {
+    return codes.map((code) => describeMatchReason(code));
+  }
+
   private buildCategoryPath(categoryRef?: {
     name: string;
     parent?: {

backend/src/flyer-import/services/ai-flyer-parser.service.spec.ts

@@ -4,6 +4,15 @@ import { AiFlyerParserService } from './ai-flyer-parser.service';
 describe('AiFlyerParserService dedupe', () => {
   const service = Object.create(AiFlyerParserService.prototype) as AiFlyerParserService;
 
+  it('buildPrompt enforces Swedish diacritics for cheese variants', () => {
+    const prompt = (service as any).buildPrompt('PRAST, HERRGARD, GREVE', 3000) as string;
+
+    expect(prompt).toContain('Behåll svenska diakritiska tecken (ä, å, ö, é)');
+    expect(prompt).toContain('Prästost');
+    expect(prompt).toContain('Herrgårdsost');
+    expect(prompt).toContain('Grevéost');
+  });
+
   it('dedupes same product with minor offer text differences', () => {
     const items = [
       {

backend/src/flyer-import/services/ai-flyer-parser.service.ts

@@ -214,10 +214,11 @@ Regler:
 6) Om en rubrik/lista innehaller flera kommaseparerade namn och efterfoljande rad/rader innehaller gemensam brand, vikt, pris eller kampanjvillkor: expandera till separata objekt (en per namn) och arv all gemensam metadata.
 7) Tillämpa samma split-regel generellt for liknande tillbud (inte bara ost), nar listan tydligt representerar produktvarianter/smaker/sorter.
 8) Splitta INTE om listan snarare ar ingredienser, avdelningar, eller otydlig marknadsforing utan tydlig produktvariant.
-9) Specialregel ost: namn som PRAST/HERRGARD/GREVE ska normaliseras till Prastost/Herrgardsost/Greveost.
+9) Specialregel ost: namn som PRAST/HERRGARD/GREVE ska normaliseras till Prästost/Herrgårdsost/Grevéost.
 10) Om texten innehaller "ARLA KO" ska brand vara exakt "Arla Ko".
 11) For ovan ostsorter ska category vara "Hardost".
-12) Returnera aldrig extra nycklar, text, markdown eller forklaringar utanfor JSON-arrayen.
+12) Behåll svenska diakritiska tecken (ä, å, ö, é) i produktnamn. Returnera "Prästost", "Herrgårdsost", "Grevéost" - inte ASCII-versioner.
+13) Returnera aldrig extra nycklar, text, markdown eller forklaringar utanfor JSON-arrayen.
 
 Exempel bundle utdata:
 [
@@ -258,7 +259,7 @@ Input-idé: "PRAST, HERRGARD, GREVE" + "ARLA KO" + gemensam vikt/pris.
 Output-idé:
 [
   {
-    "name": "Prastost",
+    "name": "Prästost",
     "brand": "Arla Ko",
     "category": "Hardost",
     "isBundle": false,
@@ -271,7 +272,7 @@ Output-idé:
     "offer": ["Max 3 forp/hushall"]
   },
   {
-    "name": "Herrgardsost",
+    "name": "Herrgårdsost",
     "brand": "Arla Ko",
     "category": "Hardost",
     "isBundle": false,
@@ -358,7 +359,7 @@ ${truncatedText}`;
   private normalizeName(name: string): string {
     return name
       .toLowerCase()
-      .replace(/[^a-zåäö0-9\s]/g, '')
+      .replace(/[^a-zåäöé0-9\s]/g, '')
       .replace(/\s+/g, ' ')
       .trim();
   }
@@ -427,7 +428,7 @@ ${truncatedText}`;
           'Mistral-anrop timeout',
         );
 
-        const content = response.choices?.[0]?.message?.content;
+        const content = this.ensureUtf8Content(response.choices?.[0]?.message?.content);
         if (!content) {
           throw new BadRequestException('Tomt svar från AI-modellen.');
         }
@@ -531,6 +532,40 @@ ${truncatedText}`;
     return hasCampaignMarkers ? normalized : '';
   }
 
+  private ensureUtf8Content(content: unknown): string {
+    const asString = this.flattenContent(content);
+    if (!asString) return '';
+
+    const utf8 = Buffer.from(asString, 'utf8').toString('utf8');
+    if (this.debugEnabled && (asString.includes('\uFFFD') || utf8.includes('\uFFFD'))) {
+      const hex = Buffer.from(asString, 'utf8').toString('hex').slice(0, 256);
+      this.logger.debug(`Potential encoding issue in AI response (hex preview): ${hex}`);
+    }
+    return utf8;
+  }
+
+  private flattenContent(content: unknown): string {
+    if (typeof content === 'string') {
+      return content;
+    }
+    if (Array.isArray(content)) {
+      return content
+        .map((part) => {
+          if (typeof part === 'string') return part;
+          if (part && typeof part === 'object' && 'text' in part) {
+            const text = (part as { text?: unknown }).text;
+            return typeof text === 'string' ? text : '';
+          }
+          return '';
+        })
+        .join('');
+    }
+    if (content == null) {
+      return '';
+    }
+    return String(content);
+  }
+
   private readPositiveIntEnv(key: string, fallback: number): number {
     const raw = process.env[key];
     if (!raw) return fallback;

backend/src/flyer-import/services/flyer-normalizer.service.spec.ts

@@ -120,12 +120,28 @@ describe('FlyerNormalizerService', () => {
       const result = service.normalize(items);
 
       expect(result).toHaveLength(3);
-      expect(result.map((item) => item.rawName)).toEqual(['Prästost', 'Herrgårdsost', 'Greveost']);
+      expect(result.map((item) => item.rawName)).toEqual(['Prästost', 'Herrgårdsost', 'Grevéost']);
       expect(result.every((item) => item.brand === 'Arla Ko')).toBe(true);
       expect(result.every((item) => item.categoryHint === 'Hårdost')).toBe(true);
       expect(result[0].parseReasons).toContain('split_cheese_variants');
     });
 
+    it('normalizes PRAST token to Prästost', () => {
+      const items = [{ rawName: 'PRAST, GREVE', brand: 'ARLA KO' }];
+
+      const result = service.normalize(items);
+
+      expect(result.map((item) => item.rawName)).toContain('Prästost');
+    });
+
+    it('normalizes GREVE token to Grevéost', () => {
+      const items = [{ rawName: 'GREVE, PRAST', brand: 'ARLA KO' }];
+
+      const result = service.normalize(items);
+
+      expect(result.map((item) => item.rawName)).toContain('Grevéost');
+    });
+
     it('keeps single cheese item unsplit but normalizes brand/category', () => {
       const items = [
         {
@@ -184,5 +200,20 @@ describe('FlyerNormalizerService', () => {
       expect(result).toHaveLength(1);
       expect(result[0].rawName).toContain('Herrgårdsost');
     });
+
+    it('fixes greveost typo in cheese context and preserves é', () => {
+      const items = [
+        {
+          rawName: 'Greveost skivad',
+          brand: 'Arla Ko',
+        },
+      ];
+
+      const result = service.normalize(items);
+
+      expect(result).toHaveLength(1);
+      expect(result[0].rawName).toContain('Grevéost');
+      expect(result[0].normalizedName).toContain('grevéost');
+    });
   });
 });

backend/src/flyer-import/services/flyer-normalizer.service.ts

@@ -26,7 +26,7 @@ export class FlyerNormalizerService {
   private readonly CHEESE_VARIANT_TO_NAME: Record<string, string> = {
     prast: 'Prästost',
     herrgard: 'Herrgårdsost',
-    greve: 'Greveost',
+    greve: 'Grevéost',
   };
 
   private readonly UNIT_MAPPING: Record<string, string> = {
@@ -140,7 +140,7 @@ export class FlyerNormalizerService {
   private normalizeName(name: string): string {
     return name
       .toLowerCase()
-      .replace(/[^a-zåäö0-9\s]/g, '')
+      .replace(/[^a-zåäöé0-9\s]/g, '')
       .replace(/\s+/g, ' ')
       .trim();
   }
@@ -256,6 +256,7 @@ export class FlyerNormalizerService {
 
     if (/ost\b|hårdost/i.test(value)) {
       corrected = corrected.replace(/\bherg{1,2}årds?ost\b/gi, (match) => (match[0] === 'H' ? 'Herrgårdsost' : 'herrgårdsost'));
+      corrected = corrected.replace(/\bgreveost\b/gi, (match) => (match[0] === 'G' ? 'Grevéost' : 'grevéost'));
     }
 
     return corrected;

backend/src/flyer-import/services/reason-codes.spec.ts

@@ -0,0 +1,71 @@
+import { describeMatchReason, describeParseReason } from './reason-codes';
+
+describe('reason-codes', () => {
+  it('describes known parse reasons in Swedish', () => {
+    expect(describeParseReason('ai_parsed')).toMatchObject({
+      kind: 'parse',
+      code: 'ai_parsed',
+      severity: 'info',
+      title: 'AI-tolkad rad',
+    });
+
+    expect(describeParseReason('split_cheese_variants')).toMatchObject({
+      kind: 'parse',
+      code: 'split_cheese_variants',
+      severity: 'info',
+    });
+
+    expect(describeParseReason('normalized')).toMatchObject({
+      kind: 'parse',
+      code: 'normalized',
+      severity: 'info',
+    });
+
+    expect(describeParseReason('low_confidence')).toMatchObject({
+      kind: 'parse',
+      code: 'low_confidence',
+      severity: 'warning',
+      title: 'Låg parsningskvalitet',
+    });
+  });
+
+  it('describes known match reasons in Swedish', () => {
+    expect(describeMatchReason('no_match')).toMatchObject({
+      kind: 'match',
+      code: 'no_match',
+      severity: 'warning',
+      title: 'Ingen produktmatchning',
+    });
+
+    expect(describeMatchReason('alias_exact')).toMatchObject({
+      kind: 'match',
+      code: 'alias_exact',
+      severity: 'info',
+    });
+
+    expect(describeMatchReason('normalized_exact')).toMatchObject({
+      kind: 'match',
+      code: 'normalized_exact',
+      severity: 'info',
+    });
+
+    expect(describeMatchReason('token_overlap:0.72')).toMatchObject({
+      kind: 'match',
+      code: 'token_overlap',
+      severity: 'info',
+      title: 'Tokenmatchning',
+    });
+
+    expect(describeMatchReason('alias_points_to_missing_product')).toMatchObject({
+      kind: 'match',
+      code: 'alias_points_to_missing_product',
+      severity: 'error',
+    });
+
+    expect(describeMatchReason('empty_name')).toMatchObject({
+      kind: 'match',
+      code: 'empty_name',
+      severity: 'error',
+    });
+  });
+});

backend/src/flyer-import/services/reason-codes.ts

@@ -0,0 +1,184 @@
+export type ReasonKind = 'parse' | 'match';
+export type ReasonSeverity = 'info' | 'warning' | 'error';
+
+export type ParseReasonCode =
+  | 'ai_parsed'
+  | 'split_cheese_variants'
+  | 'normalized'
+  | 'low_confidence';
+
+export type MatchReasonCode =
+  | 'no_match'
+  | 'alias_exact'
+  | 'normalized_exact'
+  | 'token_overlap'
+  | 'alias_points_to_missing_product'
+  | 'empty_name';
+
+export type FlyerReasonDescriptor = {
+  code: string;
+  kind: ReasonKind;
+  title: string;
+  message: string;
+  severity: ReasonSeverity;
+  location: string | null;
+};
+
+export type DescribeReasonContext = {
+  location?: string | null;
+  itemIndex?: number;
+  lang?: 'sv';
+};
+
+const PARSE_DEFAULT_LOCATION = 'Steg: AI-parser';
+const MATCH_DEFAULT_LOCATION = 'Steg: matchning mot dina produkter';
+
+export function describeParseReason(
+  rawCode: string,
+  context?: DescribeReasonContext,
+): FlyerReasonDescriptor {
+  const code = normalizeCode(rawCode);
+  const location = context?.location ?? PARSE_DEFAULT_LOCATION;
+
+  switch (code) {
+    case 'ai_parsed':
+      return {
+        code,
+        kind: 'parse',
+        title: 'AI-tolkad rad',
+        message: 'Raden tolkades av AI utan att en deterministisk regel matchade.',
+        severity: 'info',
+        location,
+      };
+    case 'split_cheese_variants':
+      return {
+        code,
+        kind: 'parse',
+        title: 'Variant-split',
+        message: 'Gruppannonsen expanderades till individuella ostvarianter.',
+        severity: 'info',
+        location,
+      };
+    case 'normalized':
+      return {
+        code,
+        kind: 'parse',
+        title: 'Normaliserad rad',
+        message: 'Produkttexten normaliserades för bättre matchning.',
+        severity: 'info',
+        location,
+      };
+    case 'low_confidence':
+      return {
+        code,
+        kind: 'parse',
+        title: 'Låg parsningskvalitet',
+        message: 'Modellens säkerhet är låg, granska raden manuellt.',
+        severity: 'warning',
+        location,
+      };
+    default:
+      return {
+        code,
+        kind: 'parse',
+        title: 'Okänd parserorsak',
+        message: `En okänd parserorsak rapporterades: ${rawCode}`,
+        severity: 'warning',
+        location,
+      };
+  }
+}
+
+export function describeMatchReason(
+  rawCode: string,
+  context?: DescribeReasonContext,
+): FlyerReasonDescriptor {
+  const location = context?.location ?? MATCH_DEFAULT_LOCATION;
+  const code = normalizeCode(rawCode);
+
+  switch (code) {
+    case 'no_match':
+      return {
+        code,
+        kind: 'match',
+        title: 'Ingen produktmatchning',
+        message:
+          'Vi kunde inte hitta någon befintlig produkt som matchar texten på flyern.',
+        severity: 'warning',
+        location,
+      };
+    case 'alias_exact':
+      return {
+        code,
+        kind: 'match',
+        title: 'Aliasmatchning',
+        message: 'Raden matchades exakt via ett registrerat alias.',
+        severity: 'info',
+        location,
+      };
+    case 'normalized_exact':
+      return {
+        code,
+        kind: 'match',
+        title: 'Exakt normaliserad matchning',
+        message: 'Raden matchades exakt efter normalisering av produktnamnet.',
+        severity: 'info',
+        location,
+      };
+    case 'token_overlap': {
+      const overlap = parseTokenOverlap(rawCode);
+      const overlapSuffix = overlap == null ? '' : ` (överlapp: ${Math.round(overlap * 100)}%)`;
+      return {
+        code,
+        kind: 'match',
+        title: 'Tokenmatchning',
+        message: `Raden matchades med tokenöverlapp mot en befintlig produkt${overlapSuffix}.`,
+        severity: 'info',
+        location,
+      };
+    }
+    case 'alias_points_to_missing_product':
+      return {
+        code,
+        kind: 'match',
+        title: 'Trasig alias-koppling',
+        message: 'Ett alias pekar på en produkt som inte längre finns.',
+        severity: 'error',
+        location,
+      };
+    case 'empty_name':
+      return {
+        code,
+        kind: 'match',
+        title: 'Tomt produktnamn',
+        message: 'Raden saknar tolkbart produktnamn.',
+        severity: 'error',
+        location,
+      };
+    default:
+      return {
+        code,
+        kind: 'match',
+        title: 'Okänd matchorsak',
+        message: `En okänd matchorsak rapporterades: ${rawCode}`,
+        severity: 'warning',
+        location,
+      };
+  }
+}
+
+function normalizeCode(rawCode: string): string {
+  const trimmed = String(rawCode ?? '').trim();
+  if (trimmed.startsWith('token_overlap:')) {
+    return 'token_overlap';
+  }
+  return trimmed;
+}
+
+function parseTokenOverlap(rawCode: string): number | null {
+  const match = String(rawCode).trim().match(/^token_overlap:(\d+(?:\.\d+)?)$/);
+  if (!match) return null;
+  const parsed = Number.parseFloat(match[1]);
+  if (!Number.isFinite(parsed)) return null;
+  return Math.max(0, Math.min(1, parsed));
+}

flutter/lib/features/admin/domain/admin_ai_trace_detail.dart

@@ -1,5 +1,53 @@
 import 'admin_ai_trace.dart';
 
+class AdminAiWarning {
+  final String code;
+  final String kind;
+  final String title;
+  final String message;
+  final String severity;
+  final String? location;
+  final int? itemIndex;
+
+  const AdminAiWarning({
+    required this.code,
+    required this.kind,
+    required this.title,
+    required this.message,
+    required this.severity,
+    required this.location,
+    required this.itemIndex,
+  });
+
+  factory AdminAiWarning.fromJson(Map<String, dynamic> json) {
+    return AdminAiWarning(
+      code: (json['code'] ?? '').toString(),
+      kind: (json['kind'] ?? '').toString(),
+      title: (json['title'] ?? '').toString(),
+      message: (json['message'] ?? '').toString(),
+      severity: (json['severity'] ?? '').toString(),
+      location: json['location']?.toString(),
+      itemIndex: (json['itemIndex'] as num?)?.toInt(),
+    );
+  }
+
+  factory AdminAiWarning.fromLegacy(String value) {
+    final trimmed = value.trim();
+    final parts = trimmed.split(':');
+    final kind = parts.isNotEmpty ? parts.first : 'parse';
+    final code = parts.length > 1 ? parts.sublist(1).join(':') : trimmed;
+    return AdminAiWarning(
+      code: code,
+      kind: kind,
+      title: trimmed,
+      message: trimmed,
+      severity: 'warning',
+      location: null,
+      itemIndex: null,
+    );
+  }
+}
+
 class AdminAiTraceDetail {
   final String id;
   final AdminAiTraceSource source;
@@ -13,7 +61,8 @@ class AdminAiTraceDetail {
   final int? durationMs;
   final int? retryCount;
   final int? chunkCount;
-  final List<String> warnings;
+  final List<AdminAiWarning> warnings;
+  final List<String> legacyWarnings;
   final String? error;
   final String? prompt;
   final String? rawOutput;
@@ -34,6 +83,7 @@ class AdminAiTraceDetail {
     required this.retryCount,
     required this.chunkCount,
     required this.warnings,
+    required this.legacyWarnings,
     required this.error,
     required this.prompt,
     required this.rawOutput,
@@ -43,6 +93,7 @@ class AdminAiTraceDetail {
 
   factory AdminAiTraceDetail.fromJson(Map<String, dynamic> json) {
     final warningsRaw = (json['warnings'] as List<dynamic>?) ?? const [];
+    final legacyWarningsRaw = (json['legacyWarnings'] as List<dynamic>?) ?? const [];
     final normalizedOutputMap = json['normalizedOutput'] is Map
         ? Map<String, dynamic>.from(json['normalizedOutput'] as Map)
         : null;
@@ -64,7 +115,15 @@ class AdminAiTraceDetail {
       durationMs: (json['durationMs'] as num?)?.toInt(),
       retryCount: (json['retryCount'] as num?)?.toInt(),
       chunkCount: (json['chunkCount'] as num?)?.toInt(),
-      warnings: warningsRaw.map((entry) => entry.toString()).toList(),
+      warnings: warningsRaw
+          .map((entry) {
+            if (entry is Map) {
+              return AdminAiWarning.fromJson(Map<String, dynamic>.from(entry));
+            }
+            return AdminAiWarning.fromLegacy(entry.toString());
+          })
+          .toList(),
+      legacyWarnings: legacyWarningsRaw.map((entry) => entry.toString()).toList(),
       error: json['error']?.toString(),
       prompt: json['prompt']?.toString(),
       rawOutput: json['rawOutput']?.toString(),

flutter/lib/features/admin/presentation/admin_ai_panel.dart

@@ -137,6 +137,41 @@ class _AdminAiPanelState extends ConsumerState<AdminAiPanel> {
     return const JsonEncoder.withIndent('  ').convert(data);
   }
 
+  String _formatWarningLine(AdminAiWarning warning) {
+    final rowSuffix = warning.itemIndex == null ? '' : ' (rad ${warning.itemIndex})';
+    return '[${warning.severity}] ${warning.title}$rowSuffix: ${warning.message}';
+  }
+
+  String _buildErrorReport({
+    required AdminAiTraceDetail detail,
+    required String prettyOutput,
+  }) {
+    final warningCount = detail.warnings.length;
+    final buffer = StringBuffer()
+      ..writeln('[AI-trace ${detail.id}]')
+      ..writeln('Modell: ${detail.model ?? 'okänd'}')
+      ..writeln('Status: ${detail.status.name} ($warningCount varningar)')
+      ..writeln('Tid: ${detail.createdAt.toIso8601String()}')
+      ..writeln();
+
+    if (detail.warnings.isNotEmpty) {
+      buffer.writeln('Varningar:');
+      for (final warning in detail.warnings) {
+        buffer.writeln('- ${_formatWarningLine(warning)}');
+      }
+      buffer.writeln();
+    }
+
+    buffer
+      ..writeln('Prompt:')
+      ..writeln((detail.prompt ?? '').trim().isEmpty ? '[saknas]' : detail.prompt!.trim())
+      ..writeln()
+      ..writeln('Raw output:')
+      ..writeln((detail.rawOutput ?? '').trim().isEmpty ? prettyOutput : detail.rawOutput!.trim());
+
+    return buffer.toString().trimRight();
+  }
+
   Color _statusColor(AdminAiTraceStatus status, ColorScheme scheme) {
     return switch (status) {
       AdminAiTraceStatus.success => Colors.green.shade700,
@@ -348,16 +383,30 @@ class _AdminAiPanelState extends ConsumerState<AdminAiPanel> {
             ? const <String, dynamic>{}
             : {'rawOutput': detail.rawOutput});
     final prettyOutput = _prettyOutputFor(detail.id, outputJson);
+    final errorReport = _buildErrorReport(detail: detail, prettyOutput: prettyOutput);
 
     return ListView(
       children: [
         _TraceMetaCard(detail: detail, formatDateTime: _formatDateTime),
+        const SizedBox(height: 8),
+        Align(
+          alignment: Alignment.centerLeft,
+          child: OutlinedButton.icon(
+            onPressed: () => _copyText(errorReport, 'Felrapport'),
+            icon: const Icon(Icons.bug_report_outlined),
+            label: const Text('Kopiera felrapport'),
+          ),
+        ),
         if (detail.warnings.isNotEmpty) ...[
           const SizedBox(height: 12),
           _WarningsCard(
             warnings: detail.warnings,
-            onCopyWarning: (warning) => _copyText(warning, 'Varning'),
+            onCopyWarning: (warning) =>
-            onCopyAll: () => _copyText(detail.warnings.join('\n'), 'Varningar'),
+                _copyText(_formatWarningLine(warning), 'Varning'),
+            onCopyAll: () => _copyText(
+              detail.warnings.map(_formatWarningLine).join('\n'),
+              'Varningar',
+            ),
           ),
         ],
         const SizedBox(height: 12),
@@ -583,8 +632,8 @@ class _OutputJsonCardState extends State<_OutputJsonCard> {
 }
 
 class _WarningsCard extends StatelessWidget {
-  final List<String> warnings;
+  final List<AdminAiWarning> warnings;
-  final void Function(String warning) onCopyWarning;
+  final void Function(AdminAiWarning warning) onCopyWarning;
   final VoidCallback onCopyAll;
 
   const _WarningsCard({
@@ -622,8 +671,27 @@ class _WarningsCard extends StatelessWidget {
               (warning) => ListTile(
                 dense: true,
                 contentPadding: EdgeInsets.zero,
-                leading: const Icon(Icons.warning_amber_rounded, size: 18),
+                leading: Icon(_severityIcon(warning), size: 18, color: _severityColor(warning, theme)),
-                title: SelectableText(warning),
+                title: Text(
+                  warning.title,
+                  style: theme.textTheme.bodyMedium?.copyWith(fontWeight: FontWeight.w600),
+                ),
+                subtitle: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(warning.message),
+                    if ((warning.location ?? '').trim().isNotEmpty)
+                      Text(
+                        warning.location!,
+                        style: theme.textTheme.bodySmall,
+                      ),
+                    if (warning.itemIndex != null)
+                      Text(
+                        'Rad: ${warning.itemIndex}',
+                        style: theme.textTheme.bodySmall,
+                      ),
+                  ],
+                ),
                 trailing: IconButton(
                   tooltip: 'Kopiera varning',
                   onPressed: () => onCopyWarning(warning),
@@ -636,4 +704,26 @@ class _WarningsCard extends StatelessWidget {
       ),
     );
   }
+
+  IconData _severityIcon(AdminAiWarning warning) {
+    switch (warning.severity) {
+      case 'error':
+        return Icons.error_outline;
+      case 'warning':
+        return Icons.warning_amber_rounded;
+      default:
+        return Icons.info_outline;
+    }
+  }
+
+  Color _severityColor(AdminAiWarning warning, ThemeData theme) {
+    switch (warning.severity) {
+      case 'error':
+        return theme.colorScheme.error;
+      case 'warning':
+        return Colors.orange.shade700;
+      default:
+        return theme.colorScheme.primary;
+    }
+  }
 }

flutter/lib/features/import/domain/flyer_import_item.dart

@@ -1,4 +1,6 @@
-class FlyerImportItem {
+import 'flyer_reason_descriptor.dart';
+
+class FlyerImportItem {
   final int? flyerItemId;
   final String rawName;
   final String normalizedName;
@@ -12,11 +14,14 @@ class FlyerImportItem {
   final double? comparisonPrice;
   final String? comparisonUnit;
   final double? parseConfidence;
-  final List<String> parseReasons;
+  final List<String> parseReasons;
-  final int? matchedProductId;
+  final List<FlyerReasonDescriptor> parseReasonsDetailed;
-  final String? matchedProductName;
+  final int? matchedProductId;
-  final String? matchedVia;
+  final String? matchedProductName;
-  final double? matchConfidence;
+  final String? matchedVia;
+  final double? matchConfidence;
+  final List<String> matchReasons;
+  final List<FlyerReasonDescriptor> matchReasonsDetailed;
 
   FlyerImportItem({
     required this.flyerItemId,
@@ -31,13 +36,16 @@ class FlyerImportItem {
     this.offerLimitText,
     this.comparisonPrice,
     this.comparisonUnit,
-    this.parseConfidence,
+    this.parseConfidence,
-    this.parseReasons = const [],
+    this.parseReasons = const [],
-    this.matchedProductId,
+    this.parseReasonsDetailed = const [],
-    this.matchedProductName,
+    this.matchedProductId,
-    this.matchedVia,
+    this.matchedProductName,
-    this.matchConfidence,
+    this.matchedVia,
-  });
+    this.matchConfidence,
+    this.matchReasons = const [],
+    this.matchReasonsDetailed = const [],
+  });
 
   factory FlyerImportItem.fromJson(Map<String, dynamic> json) {
     return FlyerImportItem(
@@ -53,12 +61,25 @@ class FlyerImportItem {
       offerLimitText: json['offerLimitText'] as String?,
       comparisonPrice: (json['comparisonPrice'] as num?)?.toDouble(),
       comparisonUnit: json['comparisonUnit'] as String?,
-      parseConfidence: (json['parseConfidence'] as num?)?.toDouble(),
+      parseConfidence: (json['parseConfidence'] as num?)?.toDouble(),
-      parseReasons: (json['parseReasons'] as List?)?.map((e) => e.toString()).toList() ?? const [],
+      parseReasons: (json['parseReasons'] as List?)?.map((e) => e.toString()).toList() ?? const [],
-      matchedProductId: (json['matchedProductId'] as num?)?.toInt(),
+      parseReasonsDetailed:
-      matchedProductName: json['matchedProductName'] as String?,
+          (json['parseReasonsDetailed'] as List?)
-      matchedVia: json['matchedVia'] as String?,
+                  ?.whereType<Map>()
-      matchConfidence: (json['matchConfidence'] as num?)?.toDouble(),
+                  .map((e) => FlyerReasonDescriptor.fromJson(Map<String, dynamic>.from(e)))
+                  .toList() ??
+              const [],
+      matchedProductId: (json['matchedProductId'] as num?)?.toInt(),
+      matchedProductName: json['matchedProductName'] as String?,
+      matchedVia: json['matchedVia'] as String?,
+      matchConfidence: (json['matchConfidence'] as num?)?.toDouble(),
+      matchReasons: (json['matchReasons'] as List?)?.map((e) => e.toString()).toList() ?? const [],
+      matchReasonsDetailed:
+          (json['matchReasonsDetailed'] as List?)
+                  ?.whereType<Map>()
+                  .map((e) => FlyerReasonDescriptor.fromJson(Map<String, dynamic>.from(e)))
+                  .toList() ??
+              const [],
     );
   }
 
@@ -78,10 +99,15 @@ class FlyerImportItem {
       'comparisonUnit': comparisonUnit,
       'parseConfidence': parseConfidence,
       'parseReasons': parseReasons,
+      'parseReasonsDetailed':
+          parseReasonsDetailed.map((reason) => reason.toJson()).toList(),
       'matchedProductId': matchedProductId,
       'matchedProductName': matchedProductName,
       'matchedVia': matchedVia,
       'matchConfidence': matchConfidence,
+      'matchReasons': matchReasons,
+      'matchReasonsDetailed':
+          matchReasonsDetailed.map((reason) => reason.toJson()).toList(),
     };
   }
 
@@ -105,10 +131,13 @@ class FlyerImportItem {
       comparisonUnit: comparisonUnit,
       parseConfidence: parseConfidence,
       parseReasons: parseReasons,
+      parseReasonsDetailed: parseReasonsDetailed,
       matchedProductId: matchedProductId,
       matchedProductName: matchedProductName,
       matchedVia: matchedVia,
       matchConfidence: matchConfidence,
+      matchReasons: matchReasons,
+      matchReasonsDetailed: matchReasonsDetailed,
     );
   }
 }

flutter/lib/features/import/domain/flyer_reason_descriptor.dart

@@ -0,0 +1,39 @@
+class FlyerReasonDescriptor {
+  final String code;
+  final String kind;
+  final String title;
+  final String message;
+  final String severity;
+  final String? location;
+
+  const FlyerReasonDescriptor({
+    required this.code,
+    required this.kind,
+    required this.title,
+    required this.message,
+    required this.severity,
+    required this.location,
+  });
+
+  factory FlyerReasonDescriptor.fromJson(Map<String, dynamic> json) {
+    return FlyerReasonDescriptor(
+      code: (json['code'] ?? '').toString(),
+      kind: (json['kind'] ?? '').toString(),
+      title: (json['title'] ?? '').toString(),
+      message: (json['message'] ?? '').toString(),
+      severity: (json['severity'] ?? '').toString(),
+      location: json['location']?.toString(),
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'code': code,
+      'kind': kind,
+      'title': title,
+      'message': message,
+      'severity': severity,
+      'location': location,
+    };
+  }
+}

flutter/lib/features/import/presentation/flyer_import_tab.dart

@@ -1,6 +1,6 @@
 import 'package:file_picker/file_picker.dart';
-import 'dart:typed_data';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
@@ -14,6 +14,7 @@ import '../../shopping_list/data/shopping_list_providers.dart';
 import '../data/flyer_import_session.dart';
 import '../data/import_providers.dart';
 import '../domain/flyer_import_item.dart';
+import '../domain/flyer_reason_descriptor.dart';
 import '../domain/flyer_import_result.dart';
 import 'error_dialog.dart';
 
@@ -32,6 +33,7 @@ class _FlyerImportTabState extends ConsumerState<FlyerImportTab> {
   List<AdminCategoryNode> _categoryTree = const [];
   FlyerImportResult? _result;
   final Map<int, bool> _selected = {};
+  final Map<int, bool> _expandedReasonRows = {};
 
   @override
   void initState() {
@@ -90,6 +92,7 @@ class _FlyerImportTabState extends ConsumerState<FlyerImportTab> {
           _selected
             ..clear()
             ..addAll(selected);
+          _expandedReasonRows.clear();
         });
         await _loadRestoredSourceIfNeeded(serverResult, token);
         notifier.setImportedResult(
@@ -117,6 +120,7 @@ class _FlyerImportTabState extends ConsumerState<FlyerImportTab> {
           _selected
             ..clear()
             ..addAll(selected);
+          _expandedReasonRows.clear();
         });
         await _loadRestoredSourceIfNeeded(latest, token);
         notifier.setImportedResult(
@@ -130,6 +134,7 @@ class _FlyerImportTabState extends ConsumerState<FlyerImportTab> {
           _selected
             ..clear()
             ..addAll(session.selected);
+          _expandedReasonRows.clear();
         });
       }
     } catch (_) {
@@ -141,6 +146,7 @@ class _FlyerImportTabState extends ConsumerState<FlyerImportTab> {
         _selected
           ..clear()
           ..addAll(session.selected);
+        _expandedReasonRows.clear();
       });
     }
   }
@@ -196,6 +202,7 @@ class _FlyerImportTabState extends ConsumerState<FlyerImportTab> {
         _selected
           ..clear()
           ..addAll(selected);
+        _expandedReasonRows.clear();
       });
       ref.read(flyerImportSessionProvider.notifier).setImportedResult(
             result: parsed,
@@ -494,6 +501,39 @@ class _FlyerImportTabState extends ConsumerState<FlyerImportTab> {
     );
   }
 
+  Future<void> _copyText(String value, String label) async {
+    await Clipboard.setData(ClipboardData(text: value));
+    if (!mounted) return;
+    ScaffoldMessenger.of(context)
+        .showSnackBar(SnackBar(content: Text('$label kopierad')));
+  }
+
+  IconData _reasonSeverityIcon(String severity) {
+    switch (severity) {
+      case 'error':
+        return Icons.error_outline;
+      case 'warning':
+        return Icons.warning_amber_rounded;
+      default:
+        return Icons.info_outline;
+    }
+  }
+
+  Color _reasonSeverityColor(String severity) {
+    switch (severity) {
+      case 'error':
+        return Colors.red.shade700;
+      case 'warning':
+        return Colors.orange.shade700;
+      default:
+        return Colors.blue.shade700;
+    }
+  }
+
+  int _countWarningReasons(List<FlyerReasonDescriptor> reasons) {
+    return reasons.where((reason) => reason.severity == 'warning' || reason.severity == 'error').length;
+  }
+
   Widget _buildWarningsPanel(ThemeData theme) {
     final warnings = _result?.warnings ?? const <String>[];
     if (warnings.isEmpty) return const SizedBox.shrink();
@@ -526,10 +566,24 @@ class _FlyerImportTabState extends ConsumerState<FlyerImportTab> {
           const SizedBox(height: 8),
           ...warnings.map((warning) => Padding(
                 padding: const EdgeInsets.only(bottom: 4),
-                child: Text(
+                child: InkWell(
-                  '• $warning',
+                  onTap: () => _copyText(warning, 'Varning'),
-                  style: theme.textTheme.bodySmall?.copyWith(
+                  borderRadius: BorderRadius.circular(4),
-                    color: Colors.amber.shade900,
+                  child: Padding(
+                    padding: const EdgeInsets.symmetric(vertical: 2),
+                    child: Row(
+                      children: [
+                        Expanded(
+                          child: Text(
+                            '• $warning',
+                            style: theme.textTheme.bodySmall?.copyWith(
+                              color: Colors.amber.shade900,
+                            ),
+                          ),
+                        ),
+                        Icon(Icons.copy, size: 14, color: Colors.amber.shade800),
+                      ],
+                    ),
                   ),
                 ),
               )),
@@ -672,6 +726,12 @@ class _FlyerImportTabState extends ConsumerState<FlyerImportTab> {
               final sanitizedOfferText = item.offerText == null
                   ? ''
                   : _removeLimitTextFromOfferText(item.offerText!, limitText);
+              final detailedReasons = [
+                ...item.parseReasonsDetailed,
+                ...item.matchReasonsDetailed,
+              ];
+              final warningCount = _countWarningReasons(detailedReasons);
+              final reasonExpanded = _expandedReasonRows[index] == true;
 
               return CheckboxListTile(
                 value: _selected[index] ?? false,
@@ -720,6 +780,100 @@ class _FlyerImportTabState extends ConsumerState<FlyerImportTab> {
                     if (sanitizedOfferText.isNotEmpty) Text(sanitizedOfferText),
                     if (item.matchedProductName != null)
                       Text('Match: ${item.matchedProductName}'),
+                    if (detailedReasons.isNotEmpty) ...[
+                      const SizedBox(height: 6),
+                      InkWell(
+                        onTap: () => setState(
+                          () => _expandedReasonRows[index] = !reasonExpanded,
+                        ),
+                        child: Row(
+                          children: [
+                            Container(
+                              padding: const EdgeInsets.symmetric(
+                                  horizontal: 8, vertical: 3),
+                              decoration: BoxDecoration(
+                                color: warningCount > 0
+                                    ? Colors.orange.shade50
+                                    : Colors.blue.shade50,
+                                borderRadius: BorderRadius.circular(999),
+                                border: Border.all(
+                                  color: warningCount > 0
+                                      ? Colors.orange.shade200
+                                      : Colors.blue.shade200,
+                                ),
+                              ),
+                              child: Text(
+                                warningCount > 0
+                                    ? '$warningCount varningar'
+                                    : '${detailedReasons.length} info',
+                                style: theme.textTheme.labelSmall?.copyWith(
+                                  color: warningCount > 0
+                                      ? Colors.orange.shade900
+                                      : Colors.blue.shade900,
+                                  fontWeight: FontWeight.w700,
+                                ),
+                              ),
+                            ),
+                            const SizedBox(width: 8),
+                            Icon(
+                              reasonExpanded
+                                  ? Icons.expand_less
+                                  : Icons.expand_more,
+                              size: 18,
+                            ),
+                          ],
+                        ),
+                      ),
+                      if (reasonExpanded)
+                        ...detailedReasons.map(
+                          (reason) => Padding(
+                            padding: const EdgeInsets.only(top: 6),
+                            child: Row(
+                              crossAxisAlignment: CrossAxisAlignment.start,
+                              children: [
+                                Padding(
+                                  padding:
+                                      const EdgeInsets.only(top: 2, right: 6),
+                                  child: Icon(
+                                    _reasonSeverityIcon(reason.severity),
+                                    size: 16,
+                                    color: _reasonSeverityColor(
+                                      reason.severity,
+                                    ),
+                                  ),
+                                ),
+                                Expanded(
+                                  child: Column(
+                                    crossAxisAlignment:
+                                        CrossAxisAlignment.start,
+                                    children: [
+                                      Text(
+                                        reason.title,
+                                        style: theme.textTheme.bodySmall
+                                            ?.copyWith(
+                                          fontWeight: FontWeight.w700,
+                                        ),
+                                      ),
+                                      Text(
+                                        reason.message,
+                                        style: theme.textTheme.bodySmall,
+                                      ),
+                                      if ((reason.location ?? '').isNotEmpty)
+                                        Text(
+                                          reason.location!,
+                                          style: theme.textTheme.bodySmall
+                                              ?.copyWith(
+                                            color: theme.colorScheme.primary,
+                                          ),
+                                        ),
+                                    ],
+                                  ),
+                                ),
+                              ],
+                            ),
+                          ),
+                        ),
+                    ],
                   ],
                 ),
                 controlAffinity: ListTileControlAffinity.leading,

flutter/test/features/admin/presentation/admin_ai_panel_test.dart

@@ -86,7 +86,28 @@ void main() {
     durationMs: 1880,
     retryCount: 1,
     chunkCount: 3,
-    warnings: const ['parse:low_confidence', 'match:no_match'],
+    warnings: const [
+      AdminAiWarning(
+        code: 'low_confidence',
+        kind: 'parse',
+        title: 'Låg parsningskvalitet',
+        message: 'Modellens säkerhet är låg, granska raden manuellt.',
+        severity: 'warning',
+        location: 'Steg: AI-parser',
+        itemIndex: 5,
+      ),
+      AdminAiWarning(
+        code: 'no_match',
+        kind: 'match',
+        title: 'Ingen produktmatchning',
+        message:
+            'Vi kunde inte hitta någon befintlig produkt som matchar texten på flyern.',
+        severity: 'warning',
+        location: 'Steg: matchning mot dina produkter',
+        itemIndex: 7,
+      ),
+    ],
+    legacyWarnings: const ['parse:low_confidence', 'match:no_match'],
     error: null,
     prompt: 'Prompttext exempel',
     rawOutput: veryLargeOutput,
@@ -198,8 +219,8 @@ void main() {
 
       expect(find.text('Sammanfattning'), findsOneWidget);
       expect(find.text('Varningar (2)'), findsOneWidget);
-      expect(find.text('parse:low_confidence'), findsOneWidget);
+      expect(find.text('Låg parsningskvalitet'), findsOneWidget);
-      expect(find.text('match:no_match'), findsOneWidget);
+      expect(find.text('Ingen produktmatchning'), findsOneWidget);
       final detailScroll = find.byType(Scrollable).last;
       await tester.scrollUntilVisible(
         find.text('Model Output'),
@@ -219,9 +240,11 @@ void main() {
       final copyPrompt = find.byTooltip('Kopiera');
       final copyOutput = find.byTooltip('Kopiera JSON');
       final copyWarnings = find.byTooltip('Kopiera alla varningar');
+      final copyErrorReport = find.text('Kopiera felrapport');
       expect(copyPrompt, findsOneWidget);
       expect(copyOutput, findsOneWidget);
       expect(copyWarnings, findsOneWidget);
+      expect(copyErrorReport, findsOneWidget);
 
       await tester.tap(copyPrompt);
       await tester.pumpAndSettle();
@@ -235,6 +258,10 @@ void main() {
       await tester.pumpAndSettle();
       expect(tester.takeException(), isNull);
 
+      await tester.tap(copyErrorReport);
+      await tester.pumpAndSettle();
+      expect(tester.takeException(), isNull);
+
       addTearDown(() => tester.binding.setSurfaceSize(null));
     });
   });