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/app/api/ai/tags/route.ts

@@ -1,5 +1,6 @@
 import { NextRequest, NextResponse } from 'next/server';
 import { getAIProvider } from '@/lib/ai/factory';
+import { getSystemConfig } from '@/lib/config';
 import { z } from 'zod';
 
 const requestSchema = z.object({
@@ -11,16 +12,16 @@ export async function POST(req: NextRequest) {
     const body = await req.json();
     const { content } = requestSchema.parse(body);
 
-    const provider = getAIProvider();
+    const config = await getSystemConfig();
+    const provider = getAIProvider(config);
     const tags = await provider.generateTags(content);
-    console.log('[API Tags] Generated tags:', tags);
 
     return NextResponse.json({ tags });
   } catch (error: any) {
     console.error('Erreur API tags:', error);
     
     if (error instanceof z.ZodError) {
-      return NextResponse.json({ error: error.errors }, { status: 400 });
+      return NextResponse.json({ error: error.issues }, { status: 400 });
     }
 
     return NextResponse.json(

keep-notes/app/api/ai/test/route.ts

@@ -1,27 +1,57 @@
-import { NextResponse } from 'next/server';
-import { getAIProvider } from '@/lib/ai/factory';
+import { NextRequest, NextResponse } from 'next/server'
+import { getAIProvider } from '@/lib/ai/factory'
+import { getSystemConfig } from '@/lib/config'
 
-export async function GET() {
+export async function GET(request: NextRequest) {
   try {
-    const provider = getAIProvider();
-    const providerName = process.env.AI_PROVIDER || 'openai';
-    
-    // Test simple de génération de tags sur un texte bidon
-    const testContent = "J'adore cuisiner des pâtes le dimanche soir avec ma famille.";
-    const tags = await provider.generateTags(testContent);
-    
+    const config = await getSystemConfig()
+    const provider = getAIProvider(config)
+
+    // Test with a simple embedding request
+    const testText = 'test'
+    const embeddings = await provider.getEmbeddings(testText)
+
+    if (!embeddings || embeddings.length === 0) {
+      return NextResponse.json(
+        {
+          success: false,
+          provider: config.AI_PROVIDER || 'ollama',
+          error: 'No embeddings returned',
+          details: {
+            provider: config.AI_PROVIDER || 'ollama',
+            baseUrl: config.OLLAMA_BASE_URL || process.env.OLLAMA_BASE_URL || 'http://localhost:11434',
+            model: config.AI_MODEL_EMBEDDING || process.env.OLLAMA_EMBEDDING_MODEL || 'embeddinggemma:latest'
+          }
+        },
+        { status: 500 }
+      )
+    }
+
     return NextResponse.json({
-      status: 'success',
-      provider: providerName,
-      test_tags: tags,
-      message: 'Infrastructure IA opérationnelle'
-    });
+      success: true,
+      provider: config.AI_PROVIDER || 'ollama',
+      embeddingLength: embeddings.length,
+      firstValues: embeddings.slice(0, 5),
+      details: {
+        provider: config.AI_PROVIDER || 'ollama',
+        baseUrl: config.OLLAMA_BASE_URL || process.env.OLLAMA_BASE_URL || 'http://localhost:11434',
+        model: config.AI_MODEL_EMBEDDING || process.env.OLLAMA_EMBEDDING_MODEL || 'embeddinggemma:latest'
+      }
+    })
   } catch (error: any) {
-    console.error('Erreur test IA détaillée:', error);
-    return NextResponse.json({
-      status: 'error',
-      message: error.message,
-      stack: error.stack
-    }, { status: 500 });
+    console.error('AI test error:', error)
+    return NextResponse.json(
+      {
+        success: false,
+        error: error.message || 'Unknown error',
+        stack: process.env.NODE_ENV === 'development' ? error.stack : undefined,
+        details: {
+          provider: process.env.AI_PROVIDER || 'ollama',
+          baseUrl: process.env.OLLAMA_BASE_URL || 'http://localhost:11434',
+          model: process.env.OLLAMA_EMBEDDING_MODEL || 'embeddinggemma:latest'
+        }
+      },
+      { status: 500 }
+    )
   }
 }