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.

typings.d.ts

@@ -0,0 +1,15 @@
+import type { DetailedHTMLProps, HTMLAttributes } from 'react';
+
+interface KvMdEditorProps extends HTMLAttributes<HTMLElement> {
+  markdown?: string;
+  placeholder?: string;
+}
+
+declare module 'react' {
+  namespace JSX {
+    interface IntrinsicElements {
+      'kv-template': DetailedHTMLProps<HTMLAttributes<HTMLElement>, HTMLElement>;
+      'kv-md-editor': DetailedHTMLProps<KvMdEditorProps, HTMLElement>;
+    }
+  }
+}