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/tabs/TabFavourites.jsx

@@ -0,0 +1,89 @@
+import React, { useState } from 'react'
+import ArtworkCard from '../../gallery/ArtworkCard'
+
+function FavSkeleton() {
+  return (
+    <div className="rounded-2xl overflow-hidden bg-white/5 animate-pulse">
+      <div className="aspect-square bg-white/8" />
+    </div>
+  )
+}
+
+/**
+ * TabFavourites
+ * Shows artworks the user has favourited.
+ */
+export default function TabFavourites({ favourites, isOwner, username }) {
+  const [items, setItems] = useState(favourites ?? [])
+  const [nextCursor, setNextCursor] = useState(null)
+  const [loadingMore, setLoadingMore] = useState(false)
+
+  const loadMore = async () => {
+    if (!nextCursor || loadingMore) return
+    setLoadingMore(true)
+    try {
+      const res = await fetch(
+        `/api/profile/${encodeURIComponent(username)}/favourites?cursor=${encodeURIComponent(nextCursor)}`,
+        { headers: { Accept: 'application/json' } }
+      )
+      if (res.ok) {
+        const data = await res.json()
+        setItems((prev) => [...prev, ...(data.data ?? data)])
+        setNextCursor(data.next_cursor ?? null)
+      }
+    } catch (_) {}
+    setLoadingMore(false)
+  }
+
+  return (
+    <div
+      id="tabpanel-favourites"
+      role="tabpanel"
+      aria-labelledby="tab-favourites"
+      className="pt-6"
+    >
+      <h2 className="text-xs font-semibold uppercase tracking-widest text-slate-500 mb-4 flex items-center gap-2">
+        <i className="fa-solid fa-heart text-pink-400 fa-fw" />
+        {isOwner ? 'Your Favourites' : 'Favourites'}
+      </h2>
+
+      {items.length === 0 ? (
+        <div className="flex flex-col items-center justify-center py-20 text-center">
+          <div className="w-20 h-20 rounded-2xl bg-white/5 flex items-center justify-center mb-5 text-slate-500">
+            <i className="fa-solid fa-heart text-3xl" />
+          </div>
+          <p className="text-slate-400 font-medium">No favourites yet</p>
+          <p className="text-slate-600 text-sm mt-1">Artworks added to favourites will appear here.</p>
+        </div>
+      ) : (
+        <>
+          <div className="grid grid-cols-2 md:grid-cols-3 lg:grid-cols-4 gap-3">
+            {items.map((art, i) => (
+              <ArtworkCard
+                key={art.id ?? i}
+                art={art}
+                loading={i < 8 ? 'eager' : 'lazy'}
+              />
+            ))}
+            {loadingMore && Array.from({ length: 4 }).map((_, i) => <FavSkeleton key={`sk-${i}`} />)}
+          </div>
+
+          {nextCursor && (
+            <div className="mt-8 text-center">
+              <button
+                onClick={loadMore}
+                disabled={loadingMore}
+                className="inline-flex items-center gap-2 px-6 py-2.5 rounded-xl bg-white/5 hover:bg-white/10 text-slate-300 text-sm font-medium border border-white/10 transition-all"
+              >
+                {loadingMore
+                  ? <><i className="fa-solid fa-circle-notch fa-spin fa-fw" /> Loading…</>
+                  : <><i className="fa-solid fa-chevron-down fa-fw" /> Load more</>
+                }
+              </button>
+            </div>
+          )}
+        </>
+      )}
+    </div>
+  )
+}