Refactor console layout and sidebar components; implement user authentication and loading states

- Updated `RootLayout` to include user authentication logic and loading states.
- Removed redundant user authentication logic from `Page` component.
- Enhanced `AppSidebar` to fetch and display logged-in user information.
- Replaced `GravatarAvatar` with new `Avatar` component for user profile images.
- Added new pages for comment, file, post, and user management.
- Introduced utility functions for generating Gravatar URLs and fallback avatars based on usernames.
- Cleaned up unused imports and components across various files.

web/src/components/common/markdown-codeblock.tsx

@@ -46,7 +46,7 @@ export default function CodeBlock(props: React.ComponentPropsWithoutRef<"pre">)
     codeContent = extractText(child.props.children);
   }
 
-  async function handleCopy(e: React.MouseEvent<HTMLButtonElement>) {
+  async function handleCopy() {
     try {
       const ok = await copyToClipboard(codeContent);
       if (ok) toast.success(t("copy_success"));