feat: add AI command suggestions extension for Tiptap editor

- Implemented Commands plugin to handle command suggestions triggered by '@' character.
- Created suggestion configuration to filter and render command items.
- Added various command items including date, time, formatting, templates, and task management commands.
- Introduced CSS styles for the Tiptap editor to enhance UI.
- Configured TypeScript settings and Vite build for the project.

bun.config.ts

@@ -0,0 +1,15 @@
+import { build } from 'bun';
+
+await build({
+ entrypoints: ["./src/lib.ts"],
+  outdir: './dist',
+  target: 'browser',
+  format: 'esm',
+  naming: {
+    entry: 'app.js',
+  },
+  minify: false,
+  sourcemap: false,
+});
+
+console.log('✅ Build complete: dist/app.js');