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

keep-notes/lib/ai/providers/ollama.ts

@@ -3,10 +3,13 @@ import { AIProvider, TagSuggestion } from '../types';
 export class OllamaProvider implements AIProvider {
   private baseUrl: string;
   private modelName: string;
+  private embeddingModelName: string;
 
-  constructor(baseUrl: string = 'http://localhost:11434/api', modelName: string = 'llama3') {
-    this.baseUrl = baseUrl.endsWith('/') ? baseUrl.slice(0, -1) : baseUrl;
+  constructor(baseUrl: string = 'http://localhost:11434', modelName: string = 'llama3', embeddingModelName?: string) {
+    // Ensure baseUrl ends with /api for Ollama API
+    this.baseUrl = baseUrl.endsWith('/api') ? baseUrl : `${baseUrl}/api`;
     this.modelName = modelName;
+    this.embeddingModelName = embeddingModelName || modelName;
   }
 
   async generateTags(content: string): Promise<TagSuggestion[]> {
@@ -16,7 +19,7 @@ export class OllamaProvider implements AIProvider {
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({
           model: this.modelName,
-        prompt: `Analyse la note suivante et extrais les concepts clés sous forme de tags courts (1-3 mots max).
+          prompt: `Analyse la note suivante et extrais les concepts clés sous forme de tags courts (1-3 mots max).
         
         Règles:
         - Pas de mots de liaison (le, la, pour, et...).
@@ -36,13 +39,13 @@ export class OllamaProvider implements AIProvider {
       const data = await response.json();
       const text = data.response;
 
-      const jsonMatch = text.match(/\[\s*\{.*\}\s*\]/s);
+      const jsonMatch = text.match(/\[\s*\{[\s\S]*\}\s*\]/);
       if (jsonMatch) {
         return JSON.parse(jsonMatch[0]);
       }
 
       // Support pour le format { "tags": [...] }
-      const objectMatch = text.match(/\{\s*"tags"\s*:\s*(\[.*\])\s*\}/s);
+      const objectMatch = text.match(/\{\s*"tags"\s*:\s*(\[[\s\S]*\])\s*\}/);
       if (objectMatch && objectMatch[1]) {
         return JSON.parse(objectMatch[1]);
       }
@@ -60,7 +63,7 @@ export class OllamaProvider implements AIProvider {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({
-          model: this.modelName,
+          model: this.embeddingModelName,
           prompt: text,
         }),
       });
@@ -74,4 +77,4 @@ export class OllamaProvider implements AIProvider {
       return [];
     }
   }
-}
+}