feat: add profile screen and update routing; enhance login validation and logout functionality

teknisk_beskrivning_flutter.md

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+# Teknisk Beskrivning - Flutter Frontend
+
+Detta dokument beskriver vad som ar byggt, arkitekturval och teknisk kontext for Flutter-frontenden.
+Malgrupp: utvecklare och AI-assistent i denna chat.
+
+Relaterade dokument:
+- [next_steps_flutter.md](next_steps_flutter.md)
+- [flutter/README.md](flutter/README.md)
+
+## Syfte
+- Isolerad Flutter-baserad frontend i separat Docker-service.
+- Web forst, men med arkitektur som kan ateranvandas for Android/iOS.
+- Stegvis migrering av funktioner fran befintlig Next.js-frontend.
+
+## Vad som ar gjort
+- Ny compose override: [compose.flutter.yml](compose.flutter.yml).
+- Ny Flutter-service: `recipe-flutter`.
+- Service ansluten till natverk:
+  - `recipe-internal` (backend access)
+  - `proxy` (external Caddy reachability)
+- Flutter-container serverar web build via intern Caddy.
+- Exponering via extern Caddy med site `test.gynther.se` -> `recipe-flutter:5000`.
+- API anrop gar same-origin via `/api` och proxas internt till `recipe-api:8080`.
+
+## Arkitektur
+### Lager
+- Presentation: skarmar och widgets i `flutter/lib/features/*/presentation`.
+- State/Application: Riverpod providers/notifiers i `flutter/lib/features/*/data`.
+- Data/API: `ApiClient` i `flutter/lib/core/api`.
+- Platform abstraction: token storage interface i `flutter/lib/core/platform`.
+
+### Routing
+- GoRouter i [flutter/lib/core/router/app_router.dart](flutter/lib/core/router/app_router.dart).
+- Nuvarande routes:
+  - `/login`
+  - `/recipes`
+  - `/profile`
+
+### Auth
+- Login endpoint: `POST /api/auth/login`.
+- Backend kontrakt anvander `username` + `password`.
+- Token-falt i svar: `accessToken`.
+- Token lagras via `ITokenStorage` (web implementation med SharedPreferences).
+
+### Recipes
+- Recipes endpoint: `GET /api/recipes`.
+- Flutter model ar hardad for backend-falt (`name` fallback till `title`) och null-safe parsing.
+
+## Drift och deploy
+### Build/run
+- Build argument i compose: `API_BASE_URL=/api`.
+- Build command:
+  - `docker compose -f compose.yml -f compose.flutter.yml build recipe-flutter`
+- Run command:
+  - `docker compose -f compose.yml -f compose.flutter.yml up -d --no-deps recipe-flutter`
+
+### Viktiga verifieringar
+- Compose merge valid:
+  - `docker compose -f compose.yml -f compose.flutter.yml config`
+- Container reachable from external Caddy:
+  - `docker exec caddy wget -S -O- http://recipe-flutter:5000`
+- Public endpoint:
+  - `curl -I https://test.gynther.se`
+
+## Viktiga beslut
+- `compose.yml` lamnas orord; Flutter ligger i separat override-fil.
+- Flutter-web anvander same-origin API (`/api`) for att undvika mixed-content.
+- Intern Caddy i Flutter-container hanterar static hosting + `/api` proxy.
+- Feature migration sker stegvis enligt [next_steps_flutter.md](next_steps_flutter.md).
+
+## Kanda fallgropar
+- Om `recipe-flutter` inte ar i `proxy` natverket blir det 502 fran extern Caddy.
+- Om browser visar gammal JS kan gamla API-URL:er leva kvar i cache/service worker.
+- Login med email fungerar inte om backend forvantar username.
+
+## Nasta tekniska steg
+Fortsatt migrering enligt prioritering i [next_steps_flutter.md](next_steps_flutter.md):
+1. Auth parity (session behavior refinements).
+2. Recipes parity (list -> detail -> create/edit).
+3. Inventory and meal plan pages.
+4. Profile/admin parity.