feat: forum rich-text editor, emoji picker, mentions, discover nav, feed, uploads, profile

Forum:
- TipTap WYSIWYG editor with full toolbar
- @emoji-mart/react emoji picker (consistent with tweets)
- @mention autocomplete with user search API
- Fix PHP 8.4 parse errors in Blade templates
- Fix thread data display (paginator items)
- Align forum page widths to max-w-5xl

Discover:
- Extract shared _nav.blade.php partial
- Add missing nav links to for-you page
- Add Following link for authenticated users

Feed/Posts:
- Post model, controllers, policies, migrations
- Feed page components (PostComposer, FeedCard, etc)
- Post reactions, comments, saves, reports, sharing
- Scheduled publishing support
- Link preview controller

Profile:
- Profile page components (ProfileHero, ProfileTabs)
- Profile API controller

Uploads:
- Upload wizard enhancements
- Scheduled publish picker
- Studio status bar and readiness checklist

app/Http/Controllers/Api/Posts/PostAnalyticsController.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Http\Controllers\Api\Posts;
+
+use App\Http\Controllers\Controller;
+use App\Models\Post;
+use App\Services\Posts\PostAnalyticsService;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+/**
+ * POST /api/posts/{id}/impression  — record an impression (throttled)
+ * GET  /api/posts/{id}/analytics   — owner analytics summary
+ */
+class PostAnalyticsController extends Controller
+{
+    public function __construct(private PostAnalyticsService $analytics) {}
+
+    public function impression(Request $request, int $id): JsonResponse
+    {
+        $post = Post::where('status', Post::STATUS_PUBLISHED)->findOrFail($id);
+
+        // Session key: authenticated user ID or hashed IP
+        $sessionKey = $request->user()
+            ? 'u:' . $request->user()->id
+            : 'ip:' . md5($request->ip());
+
+        $counted = $this->analytics->trackImpression($post, $sessionKey);
+
+        return response()->json(['counted' => $counted]);
+    }
+
+    public function show(Request $request, int $id): JsonResponse
+    {
+        $post = Post::findOrFail($id);
+
+        // Only the post owner can view analytics
+        if ($request->user()?->id !== $post->user_id) {
+            abort(403, 'You do not own this post.');
+        }
+
+        return response()->json(['data' => $this->analytics->getSummary($post)]);
+    }
+}