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

package-lock.json

@@ -29,7 +29,6 @@
         "@libsql/client": "^0.15.15",
         "@prisma/adapter-better-sqlite3": "^7.2.0",
         "@prisma/adapter-libsql": "^7.2.0",
-        "@prisma/client": "^5.22.0",
         "@radix-ui/react-checkbox": "^1.3.3",
         "@radix-ui/react-dialog": "^1.1.15",
         "@radix-ui/react-dropdown-menu": "^2.1.16",
@@ -50,7 +49,6 @@
         "next": "16.1.1",
         "next-auth": "^5.0.0-beta.30",
         "ollama-ai-provider": "^1.2.0",
-        "prisma": "^5.22.0",
         "react": "19.2.3",
         "react-dom": "19.2.3",
         "react-grid-layout": "^2.2.2",
@@ -63,12 +61,14 @@
       },
       "devDependencies": {
         "@playwright/test": "^1.57.0",
+        "@prisma/client": "^5.22.0",
         "@tailwindcss/postcss": "^4",
         "@types/bcryptjs": "^2.4.6",
         "@types/better-sqlite3": "^7.6.13",
         "@types/node": "^20",
         "@types/react": "^19",
         "@types/react-dom": "^19",
+        "prisma": "^5.22.0",
         "tailwindcss": "^4",
         "tw-animate-css": "^1.4.0",
         "typescript": "^5"
@@ -382,6 +382,7 @@
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+      "dev": true,
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       "license": "Apache-2.0",
       "dependencies": {
@@ -395,18 +396,21 @@
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       "resolved": "https://registry.npmjs.org/@prisma/engines-version/-/engines-version-5.22.0-44.605197351a3c8bdd595af2d2a9bc3025bca48ea2.tgz",
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+      "dev": true,
       "license": "Apache-2.0"
     },
     "keep-notes/node_modules/@prisma/engines/node_modules/@prisma/debug": {
       "version": "5.22.0",
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+      "dev": true,
       "license": "Apache-2.0"
     },
     "keep-notes/node_modules/@prisma/fetch-engine": {
       "version": "5.22.0",
       "resolved": "https://registry.npmjs.org/@prisma/fetch-engine/-/fetch-engine-5.22.0.tgz",
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+      "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "@prisma/debug": "5.22.0",
@@ -418,12 +422,14 @@
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+      "dev": true,
       "license": "Apache-2.0"
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     "keep-notes/node_modules/@prisma/get-platform": {
       "version": "5.22.0",
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+      "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "@prisma/debug": "5.22.0"
@@ -433,6 +439,7 @@
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+      "dev": true,
       "license": "Apache-2.0"
     },
     "keep-notes/node_modules/@radix-ui/primitive": {
@@ -2917,6 +2924,7 @@
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+      "dev": true,
       "hasInstallScript": true,
       "license": "Apache-2.0",
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@@ -5535,7 +5543,6 @@
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       "license": "Apache-2.0",
-      "peer": true,
       "engines": {
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@@ -5875,6 +5882,7 @@
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+      "dev": true,
       "hasInstallScript": true,
       "license": "MIT",
       "optional": true,