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/prisma/client-generated/package.json

@@ -0,0 +1,97 @@
+{
+  "name": "prisma-client-0924f65183f5d4eff92dbcaaa75ea4e789cffdcbc361852cabe5beaded9c8358",
+  "main": "index.js",
+  "types": "index.d.ts",
+  "browser": "index-browser.js",
+  "exports": {
+    "./package.json": "./package.json",
+    ".": {
+      "require": {
+        "node": "./index.js",
+        "edge-light": "./wasm.js",
+        "workerd": "./wasm.js",
+        "worker": "./wasm.js",
+        "browser": "./index-browser.js",
+        "default": "./index.js"
+      },
+      "import": {
+        "node": "./index.js",
+        "edge-light": "./wasm.js",
+        "workerd": "./wasm.js",
+        "worker": "./wasm.js",
+        "browser": "./index-browser.js",
+        "default": "./index.js"
+      },
+      "default": "./index.js"
+    },
+    "./edge": {
+      "types": "./edge.d.ts",
+      "require": "./edge.js",
+      "import": "./edge.js",
+      "default": "./edge.js"
+    },
+    "./react-native": {
+      "types": "./react-native.d.ts",
+      "require": "./react-native.js",
+      "import": "./react-native.js",
+      "default": "./react-native.js"
+    },
+    "./extension": {
+      "types": "./extension.d.ts",
+      "require": "./extension.js",
+      "import": "./extension.js",
+      "default": "./extension.js"
+    },
+    "./index-browser": {
+      "types": "./index.d.ts",
+      "require": "./index-browser.js",
+      "import": "./index-browser.js",
+      "default": "./index-browser.js"
+    },
+    "./index": {
+      "types": "./index.d.ts",
+      "require": "./index.js",
+      "import": "./index.js",
+      "default": "./index.js"
+    },
+    "./wasm": {
+      "types": "./wasm.d.ts",
+      "require": "./wasm.js",
+      "import": "./wasm.js",
+      "default": "./wasm.js"
+    },
+    "./runtime/library": {
+      "types": "./runtime/library.d.ts",
+      "require": "./runtime/library.js",
+      "import": "./runtime/library.js",
+      "default": "./runtime/library.js"
+    },
+    "./runtime/binary": {
+      "types": "./runtime/binary.d.ts",
+      "require": "./runtime/binary.js",
+      "import": "./runtime/binary.js",
+      "default": "./runtime/binary.js"
+    },
+    "./generator-build": {
+      "require": "./generator-build/index.js",
+      "import": "./generator-build/index.js",
+      "default": "./generator-build/index.js"
+    },
+    "./sql": {
+      "require": {
+        "types": "./sql.d.ts",
+        "node": "./sql.js",
+        "default": "./sql.js"
+      },
+      "import": {
+        "types": "./sql.d.ts",
+        "node": "./sql.mjs",
+        "default": "./sql.mjs"
+      },
+      "default": "./sql.js"
+    },
+    "./*": "./*"
+  },
+  "version": "5.22.0",
+  "sideEffects": false
+}