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

@@ -120,7 +120,7 @@ describe('FlyerNormalizerService', () => {
       const result = service.normalize(items);
 
       expect(result).toHaveLength(3);
-      expect(result.map((item) => item.rawName)).toEqual(['Prastost', 'Herrgardsost', 'Greveost']);
+      expect(result.map((item) => item.rawName)).toEqual(['Prästost', 'Herrgårdsost', 'Greveost']);
       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');
@@ -141,5 +141,48 @@ describe('FlyerNormalizerService', () => {
       expect(result[0].brand).toBe('Arla Ko');
       expect(result[0].categoryHint).toBe('Hårdost');
     });
+
+    it('fixes known OCR typo for spröd', () => {
+      const items = [
+        {
+          rawName: 'Pröd Bakad Firre',
+          brand: 'Findus',
+        },
+      ];
+
+      const result = service.normalize(items);
+
+      expect(result).toHaveLength(1);
+      expect(result[0].rawName).toBe('Spröd Bakad Firre');
+      expect(result[0].normalizedName).toBe('spröd bakad firre');
+    });
+
+    it('does not apply spröd typo fix outside known fish context', () => {
+      const items = [
+        {
+          rawName: 'Pröd tvättmedel',
+          brand: 'Test',
+        },
+      ];
+
+      const result = service.normalize(items);
+
+      expect(result).toHaveLength(1);
+      expect(result[0].rawName).toBe('Pröd tvättmedel');
+    });
+
+    it('fixes herggårdsost only in cheese context', () => {
+      const items = [
+        {
+          rawName: 'Herggårdsost 31%',
+          brand: 'Arla Ko',
+        },
+      ];
+
+      const result = service.normalize(items);
+
+      expect(result).toHaveLength(1);
+      expect(result[0].rawName).toContain('Herrgårdsost');
+    });
   });
 });