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/PostSearchController.php

@@ -0,0 +1,85 @@
+<?php
+
+namespace App\Http\Controllers\Api\Posts;
+
+use App\Http\Controllers\Controller;
+use App\Models\Post;
+use App\Services\Posts\PostFeedService;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+/**
+ * GET /api/feed/search?q=...
+ *
+ * Searches posts body + hashtags via Meilisearch (Laravel Scout).
+ * Falls back to a simple LIKE query if Scout is unavailable.
+ */
+class PostSearchController extends Controller
+{
+    public function __construct(private PostFeedService $feedService) {}
+
+    public function search(Request $request): JsonResponse
+    {
+        $request->validate([
+            'q'    => ['required', 'string', 'min:2', 'max:100'],
+            'page' => ['nullable', 'integer', 'min:1'],
+        ]);
+
+        $query    = trim($request->input('q'));
+        $page     = max(1, (int) $request->query('page', 1));
+        $perPage  = 20;
+        $viewerId = $request->user()?->id;
+
+        // Scout search (Meilisearch)
+        try {
+            $results = Post::search($query)
+                ->where('visibility', Post::VISIBILITY_PUBLIC)
+                ->where('status', Post::STATUS_PUBLISHED)
+                ->paginate($perPage, 'page', $page);
+
+            // Load relations
+            $results->load($this->feedService->publicEagerLoads());
+
+            $formatted = $results->getCollection()
+                ->map(fn ($post) => $this->feedService->formatPost($post, $viewerId))
+                ->values();
+
+            return response()->json([
+                'data'  => $formatted,
+                'query' => $query,
+                'meta'  => [
+                    'total'        => $results->total(),
+                    'current_page' => $results->currentPage(),
+                    'last_page'    => $results->lastPage(),
+                    'per_page'     => $results->perPage(),
+                ],
+            ]);
+        } catch (\Exception $e) {
+            // Fallback: basic LIKE search on body
+            $paginated = Post::with($this->feedService->publicEagerLoads())
+                ->where('status', Post::STATUS_PUBLISHED)
+                ->where('visibility', Post::VISIBILITY_PUBLIC)
+                ->where(function ($q) use ($query) {
+                    $q->where('body', 'like', '%' . $query . '%')
+                      ->orWhereHas('hashtags', fn ($hq) => $hq->where('tag', 'like', '%' . mb_strtolower($query) . '%'));
+                })
+                ->orderByDesc('created_at')
+                ->paginate($perPage, ['*'], 'page', $page);
+
+            $formatted = $paginated->getCollection()
+                ->map(fn ($post) => $this->feedService->formatPost($post, $viewerId))
+                ->values();
+
+            return response()->json([
+                'data'  => $formatted,
+                'query' => $query,
+                'meta'  => [
+                    'total'        => $paginated->total(),
+                    'current_page' => $paginated->currentPage(),
+                    'last_page'    => $paginated->lastPage(),
+                    'per_page'     => $paginated->perPage(),
+                ],
+            ]);
+        }
+    }
+}