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/js/components/profile/ProfileStatsRow.jsx

@@ -0,0 +1,57 @@
+import React from 'react'
+
+const PILLS = [
+  { key: 'uploads_count',              label: 'Artworks',    icon: 'fa-images',       tab: 'artworks' },
+  { key: 'downloads_received_count',   label: 'Downloads',   icon: 'fa-download',     tab: null },
+  { key: 'follower_count',             label: 'Followers',   icon: 'fa-users',        tab: 'about' },
+  { key: 'following_count',            label: 'Following',   icon: 'fa-user-check',   tab: 'about' },
+  { key: 'artwork_views_received_count', label: 'Views',     icon: 'fa-eye',          tab: 'stats' },
+  { key: 'awards_received_count',      label: 'Awards',      icon: 'fa-trophy',       tab: 'stats' },
+]
+
+/**
+ * ProfileStatsRow
+ * Horizontal scrollable pill row of stat counts.
+ * Clicking a pill navigates to the relevant tab.
+ */
+export default function ProfileStatsRow({ stats, followerCount, onTabChange }) {
+  const values = {
+    uploads_count:                    stats?.uploads_count ?? 0,
+    downloads_received_count:         stats?.downloads_received_count ?? 0,
+    follower_count:                   followerCount ?? 0,
+    following_count:                  stats?.following_count ?? 0,
+    artwork_views_received_count:     stats?.artwork_views_received_count ?? 0,
+    awards_received_count:            stats?.awards_received_count ?? 0,
+  }
+
+  return (
+    <div className="bg-white/3 border-b border-white/10 overflow-x-auto" style={{ background: 'rgba(255,255,255,0.025)' }}>
+      <div className="max-w-6xl mx-auto px-4">
+        <div className="flex gap-1 py-2 min-w-max sm:min-w-0 sm:flex-wrap">
+          {PILLS.map((pill) => (
+            <button
+              key={pill.key}
+              onClick={() => pill.tab && onTabChange(pill.tab)}
+              title={pill.label}
+              disabled={!pill.tab}
+              className={`
+                flex items-center gap-2 px-4 py-2 rounded-lg text-sm transition-all
+                ${pill.tab
+                  ? 'cursor-pointer hover:bg-white/8 hover:text-white text-slate-300 group'
+                  : 'cursor-default text-slate-400'
+                }
+              `}
+              style={{ background: 'transparent' }}
+            >
+              <i className={`fa-solid ${pill.icon} fa-fw text-xs opacity-60 group-hover:opacity-80`} />
+              <span className="font-bold text-white tabular-nums">
+                {Number(values[pill.key]).toLocaleString()}
+              </span>
+              <span className="text-slate-500 text-xs hidden sm:inline">{pill.label}</span>
+            </button>
+          ))}
+        </div>
+      </div>
+    </div>
+  )
+}