feat: Complete multi-blog setup with 12 collections and subdomain routing

- Added 12 blog collections: art, bfs, dfs, problems, puzzles, reviews, reflections, vibes, workflows, magic, contests, poetry
- Created content config with glob loaders for all collections
- Added sample posts for each collection
- Fixed TypeScript collection recognition by removing duplicate config
- Made BlogPosts component collection-aware for proper routing
- Created individual post pages ([...slug].astro) for each collection
- Added Netlify subdomain routing configuration
- Updated all references to use neeldhara.blog as main domain
- Fixed navigation links in all-blogs component

Ready for GitHub/Netlify deployment with subdomain support.

src/components/ui/avatar.tsx

@@ -0,0 +1,51 @@
+import * as React from "react"
+import * as AvatarPrimitive from "@radix-ui/react-avatar"
+
+import { cn } from "@/lib/utils"
+
+function Avatar({
+  className,
+  ...props
+}: React.ComponentProps<typeof AvatarPrimitive.Root>) {
+  return (
+    <AvatarPrimitive.Root
+      data-slot="avatar"
+      className={cn(
+        "relative flex size-8 shrink-0 overflow-hidden rounded-full",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function AvatarImage({
+  className,
+  ...props
+}: React.ComponentProps<typeof AvatarPrimitive.Image>) {
+  return (
+    <AvatarPrimitive.Image
+      data-slot="avatar-image"
+      className={cn("aspect-square size-full", className)}
+      {...props}
+    />
+  )
+}
+
+function AvatarFallback({
+  className,
+  ...props
+}: React.ComponentProps<typeof AvatarPrimitive.Fallback>) {
+  return (
+    <AvatarPrimitive.Fallback
+      data-slot="avatar-fallback"
+      className={cn(
+        "bg-muted flex size-full items-center justify-center rounded-full",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+export { Avatar, AvatarImage, AvatarFallback }