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/artwork/ArtworkShareModal.jsx

@@ -1,7 +1,10 @@
-import React, { useCallback, useEffect, useRef, useState } from 'react'
+import React, { lazy, Suspense, useCallback, useEffect, useRef, useState } from 'react'
 import { createPortal } from 'react-dom'
 import ShareToast from '../ui/ShareToast'
 
+// Lazy-load the Feed share modal so artwork pages don't bundle the feed layer unless needed
+const FeedShareArtworkModal = lazy(() => import('../Feed/ShareArtworkModal'))
+
 /* ── Platform share URLs ─────────────────────────────────────────────────── */
 function facebookUrl(url) {
   return `https://www.facebook.com/sharer/sharer.php?u=${encodeURIComponent(url)}`
@@ -107,13 +110,14 @@ function trackShare(artworkId, platform) {
  *   artwork   – artwork object (id, title, description, thumbs, canonical_url, …)
  *   shareUrl  – canonical share URL
  */
-export default function ArtworkShareModal({ open, onClose, artwork, shareUrl }) {
+export default function ArtworkShareModal({ open, onClose, artwork, shareUrl, isLoggedIn = false }) {
   const backdropRef = useRef(null)
   const [linkCopied, setLinkCopied] = useState(false)
   const [embedCopied, setEmbedCopied] = useState(false)
   const [showEmbed, setShowEmbed] = useState(false)
   const [toastVisible, setToastVisible] = useState(false)
   const [toastMessage, setToastMessage] = useState('')
+  const [profileShareOpen, setProfileShareOpen] = useState(false)
 
   const url = shareUrl || artwork?.canonical_url || (typeof window !== 'undefined' ? window.location.href : '#')
   const title = artwork?.title || 'Artwork'
@@ -213,6 +217,12 @@ export default function ArtworkShareModal({ open, onClose, artwork, shareUrl })
       onClick: () => { window.location.href = emailUrl(url, title); trackShare(artwork?.id, 'email') },
       className: 'border-white/[0.08] bg-white/[0.04] text-white/70 hover:border-white/[0.15] hover:bg-white/[0.07] hover:text-white',
     },
+    ...(isLoggedIn ? [{
+      label: 'My Profile',
+      icon: <i className="fa-solid fa-share-nodes h-5 w-5 text-[1.1rem]" />,
+      onClick: () => setProfileShareOpen(true),
+      className: 'border-sky-500/30 bg-sky-500/10 text-sky-400 hover:border-sky-400/50 hover:bg-sky-500/20',
+    }] : []),
   ]
 
   return createPortal(
@@ -330,6 +340,26 @@ export default function ArtworkShareModal({ open, onClose, artwork, shareUrl })
         visible={toastVisible}
         onHide={() => setToastVisible(false)}
       />
+
+      {/* Share to Profile (Feed) modal — lazy loaded */}
+      {profileShareOpen && (
+        <Suspense fallback={null}>
+          <FeedShareArtworkModal
+            isOpen={profileShareOpen}
+            onClose={() => setProfileShareOpen(false)}
+            preselectedArtwork={artwork?.id ? {
+              id:        artwork.id,
+              title:     artwork.title,
+              thumb_url: artwork.thumbs?.md?.url ?? artwork.thumbs?.lg?.url ?? null,
+              user:      artwork.user ?? null,
+            } : null}
+            onShared={() => {
+              setProfileShareOpen(false)
+              showToast('Shared to your profile!')
+            }}
+          />
+        </Suspense>
+      )}
     </>,
     document.body,
   )