Platform-wide UX fixes: assignment dialog, invalidation, settings, dashboard

1. Assignment dialog overhaul: replace raw UUID inputs with searchable
   juror Combobox (shows name, email, capacity) and multi-select project
   checklist with bulk assignment support

2. Query invalidation sweep: fix missing invalidations in
   assignment-preview-sheet (roundAssignment.execute) and
   filtering-dashboard (filtering.finalizeResults) so data refreshes
   without page reload

3. Rename Submissions tab to Document Windows with descriptive
   header explaining upload window configuration

4. Connect 6 disconnected settings: storage_provider, local_storage_path,
   avatar_max_size_mb, allowed_image_types, whatsapp_enabled,
   whatsapp_provider - all now accessible in Settings UI

5. Admin dashboard redesign: branded Editorial Command Center with
   Dark Blue gradient header, colored border-l-4 stat cards, staggered
   animations, 2-column layout, action-required panel, activity timeline

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

src/components/admin/round/filtering-dashboard.tsx

@@ -198,6 +198,8 @@ export function FilteringDashboard({ competitionId, roundId }: FilteringDashboar
     onSuccess: (data) => {
       utils.filtering.getResults.invalidate()
       utils.filtering.getResultStats.invalidate({ roundId })
+      utils.roundEngine.getProjectStates.invalidate({ roundId })
+      utils.project.list.invalidate()
       toast.success(
         `Finalized: ${data.passed} passed, ${data.filteredOut} filtered out` +
         (data.advancedToStageName ? `. Next round: ${data.advancedToStageName}` : '')