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

resources/views/forum/community/edit-post.blade.php

@@ -1,27 +1,19 @@
 @extends('layouts.nova')
 
+@php
+    $forumEditPostProps = json_encode([
+        'post'      => ['id' => $post->id, 'content' => $post->content],
+        'thread'    => ['id' => $thread->id, 'title' => $thread->title, 'slug' => $thread->slug],
+        'csrfToken' => csrf_token(),
+        'errors'    => $errors->toArray(),
+    ], JSON_THROW_ON_ERROR | JSON_UNESCAPED_UNICODE);
+@endphp
+
 @section('content')
-    <div class="legacy-page max-w-3xl">
-        <div class="mb-6">
-            <a href="{{ route('forum.thread.show', ['thread' => $thread->id, 'slug' => $thread->slug]) }}" class="text-sm text-sky-300 hover:text-sky-200">← Back to thread</a>
-            <h1 class="mt-2 text-2xl font-semibold text-white">Edit post</h1>
-        </div>
-
-        <form method="POST" action="{{ route('forum.post.update', ['post' => $post->id]) }}" class="space-y-4 rounded-lg border border-white/10 bg-zinc-900/70 p-4">
-            @csrf
-            @method('PUT')
-
-            <div>
-                <label for="content" class="mb-1 block text-sm font-medium text-zinc-200">Content</label>
-                <textarea id="content" name="content" rows="10" required class="w-full rounded border border-white/10 bg-zinc-950 px-3 py-2 text-zinc-100">{{ old('content', $post->content) }}</textarea>
-                @error('content')
-                    <div class="mt-1 text-xs text-red-400">{{ $message }}</div>
-                @enderror
-            </div>
-
-            <div>
-                <button type="submit" class="rounded bg-sky-600 px-4 py-2 text-sm font-medium text-white hover:bg-sky-500">Save changes</button>
-            </div>
-        </form>
-    </div>
+<div id="forum-edit-post-root"></div>
+<script type="application/json" id="forum-edit-post-props">{!! $forumEditPostProps !!}</script>
 @endsection
+
+@push('scripts')
+    @vite(['resources/js/entry-forum.jsx'])
+@endpush