fix: improve note interactions and markdown LaTeX support
## Bug Fixes ### Note Card Actions - Fix broken size change functionality (missing state declaration) - Implement React 19 useOptimistic for instant UI feedback - Add startTransition for non-blocking updates - Ensure smooth animations without page refresh - All note actions now work: pin, archive, color, size, checklist ### Markdown LaTeX Rendering - Add remark-math and rehype-katex plugins - Support inline equations with dollar sign syntax - Support block equations with double dollar sign syntax - Import KaTeX CSS for proper styling - Equations now render correctly instead of showing raw LaTeX ## Technical Details - Replace undefined currentNote references with optimistic state - Add optimistic updates before server actions for instant feedback - Use router.refresh() in transitions for smart cache invalidation - Install remark-math, rehype-katex, and katex packages ## Testing - Build passes successfully with no TypeScript errors - Dev server hot-reloads changes correctly
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# Story 3.2: Recherche Sémantique par Intention
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Status: ready-for-dev
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## Story
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As a user,
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I want to search for notes using natural language concepts,
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So that I can find information even if I don't remember the exact words.
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## Acceptance Criteria
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1. **Given** a search query in the search bar.
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2. **When** the search is executed.
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3. **Then** the system generates an embedding for the query via the AI Provider.
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4. **And** the system calculates the cosine similarity between the query embedding and all note embeddings in memory.
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5. **And** notes with high similarity (e.g., > 0.7) are returned even without keyword matches.
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## Tasks / Subtasks
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- [ ] Implémentation de la fonction de Similarité Cosinus (AC: 4)
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- [ ] Créer une fonction utilitaire `cosineSimilarity(vecA, vecB)`
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- [ ] Mise à jour de `searchNotes` dans `actions/notes.ts` (AC: 1, 2, 3, 4)
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- [ ] Générer l'embedding de la requête utilisateur
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- [ ] Récupérer toutes les notes avec leurs embeddings
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- [ ] Calculer le score sémantique pour chaque note
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- [ ] Logique de Ranking (AC: 5)
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- [ ] Filtrer les résultats par un seuil de similarité
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- [ ] Trier par score décroissant
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- [ ] Optimisation
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- [ ] Mettre en cache les embeddings des notes en mémoire pour éviter le parsing JSON répétitif
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## Dev Notes
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- **Algorithme :** La similarité cosinus est le produit scalaire divisé par le produit des normes.
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- **Hybridité :** Cette story se concentre sur la partie sémantique. La story 3.3 s'occupera de la fusion propre avec la recherche textuelle (SQL LIKE).
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- **Performance :** Le calcul de similarité pour 1000 notes prend environ 1ms en JS.
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## Dev Agent Record
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### Agent Model Used
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### Debug Log References
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### Completion Notes List
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### File List
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