Improve admin candidate modal UX and add clip menu visibility toggle

- Widen AdminCandidateEditorModal to size lg for better readability
- Rename "Clip-Compilation" section to "Clip / Compilation", update copy to reflect single clips too, drop upload hint and Clip-Plattform field, rename label to "Link"
- Fix NativeSelect dropdown clipping inside overflow-y-auto modals by teleporting the menu to body with fixed positioning, flip-up logic, and dynamic maxHeight capped to viewport
- Add ClipAdminMenuVisible setting (backend domain, contracts, endpoint, migration) with matching frontend types, defaults, form wiring, and toggle in the Clip-Workflow modal — hides the Clips nav item from the admin sidebar when disabled

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/home/useHomeLandingPresentation.ts

@@ -120,10 +120,11 @@ export function useHomeModalCandidatePresentation(params: {
       const clipUrl = candidate.clipUrl?.trim() || null
       const clipTitle = candidate.clipTitle?.trim() || 'Highlight-Clip ansehen'
       const clipPlatform = clipUrl ? candidate.clipPlatform?.trim() || candidate.platform : 'Clip fehlt'
-      const clipEmbed = clipUrl ? buildClipEmbed(clipUrl) : null
+      const clipEmbed = clipUrl && candidate.clipEmbedStatus !== 'link_only' ? buildClipEmbed(clipUrl) : null
       return {
         name: candidate.displayName,
         handle: candidate.channelSlug,
+        url: resolveCandidateUrl(candidate.channelUrl, candidate.channelSlug),
         platform: candidate.platform,
         initials: initialsFor(candidate.displayName),
         clipUrl,
@@ -138,7 +139,7 @@ export function useHomeModalCandidatePresentation(params: {
         onPick: () => cat && pickNominee(cat.id, idx),
         cardStyle: `display:flex;align-items:center;justify-content:space-between;gap:12px;padding:13px 15px;border-radius:13px;transition:all .15s;border:1.5px solid ${selected ? '#8b6cdb;background:#f6f1fd;' : '#ece4f6;background:#fff;'}`,
         btnStyle: "flex:none;white-space:nowrap;padding:8px 16px;border-radius:9px;border:none;cursor:pointer;font-family:'Outfit',sans-serif;font-weight:600;font-size:13px;transition:all .15s;" + (selected ? 'background:linear-gradient(135deg,#8b6cdb,#7355c8);color:#fff;' : 'background:#f1ecfb;color:#8b6cdb;'),
-        btnLabel: selected ? '✓ Gewählt' : 'Auswählen',
+        btnLabel: selected ? 'Auswahl entfernen' : 'Für Clip voten',
       }
     })
   })
@@ -149,6 +150,21 @@ export function useHomeModalCandidatePresentation(params: {
   }
 }
 
+function resolveCandidateUrl(channelUrl: string | null | undefined, channelSlug: string) {
+  const url = channelUrl?.trim() || channelSlug.trim()
+  if (!isHttpUrl(url) || url === '#') return null
+  return url
+}
+
+function isHttpUrl(value: string) {
+  try {
+    const url = new URL(value)
+    return url.protocol === 'http:' || url.protocol === 'https:'
+  } catch {
+    return false
+  }
+}
+
 function formatDateLabel(value: string) {
   if (!value) return 'Noch nicht terminiert'
   const date = new Date(`${value}T00:00:00`)