refactor(ai): enhance AI trace integration and OCR normalization

- Add FlyerTraceSupplement type for AI trace metadata
- Implement getFlyerTraceSupplements method to fetch trace supplements
- Update AiTraceService to include prompt/rawOutput and counters in flyer traces
- Add persistFlyerTrace method to FlyerImportService for trace persistence
- Enhance AiFlyerParserService to return structured trace data with prompts and retries
- Update FlyerNormalizerService with OCR typo fixes for cheese variants and spröd bakad firre
- Improve Flutter admin panel with selectable text, warnings display, and tooltips
- Add comprehensive tests for AI trace supplements and normalization rules

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

@@ -90,4 +90,59 @@ describe('AiTraceService receipt masking', () => {
       }),
     );
   });
+
+  it('returns flyer prompt/rawOutput and trace counters from aiTrace supplement', async () => {
+    prismaMock.flyerSession.findUnique.mockResolvedValue({
+      id: 101,
+      userId: 7,
+      createdAt: new Date('2026-05-21T12:00:00.000Z'),
+      sourceFileName: 'willys.pdf',
+      sourceMimeType: 'application/pdf',
+      sourceFileSize: 12345,
+      user: { username: 'admin', email: 'admin@example.com' },
+      items: [
+        {
+          id: 1,
+          rawName: 'Tomat',
+          normalizedName: 'tomat',
+          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: ['low_confidence'],
+          matchedProductId: null,
+          matchedProductName: null,
+          matchedVia: 'none',
+          matchConfidence: null,
+          matchReasons: [],
+        },
+      ],
+    });
+
+    prismaMock.aiTrace.findMany.mockResolvedValue([
+      {
+        sessionId: 101,
+        prompt: 'Flyer prompt med email kund@example.com',
+        rawOutput: '{"ok":true}',
+        normalizedOutput: { retryCount: 2, chunkCount: 4 },
+      },
+    ]);
+
+    const result = await service.getTraceById('flyer-101');
+
+    expect(result.prompt).toContain('[MASKED]');
+    expect(result.rawOutput).toContain('{"ok":true}');
+    expect(result.retryCount).toBe(2);
+    expect(result.chunkCount).toBe(4);
+    expect(result.warnings).toContain('parse:low_confidence');
+  });
 });