feat: post approval workflow, i18n completion, and multiple fixes

- Add approval process to posts (approver multi-select, rejected status column)
- Reorganize PostDetailPanel into Content, Scheduling, Approval sections
- Fix save button visibility: move to fixed footer via SlidePanel footer prop
- Change date picker from datetime-local to date-only
- Complete Arabic translations across all panels (Header, Issues, Artefacts)
- Fix artefact versioning to start empty (copyFromPrevious defaults to false)
- Separate media uploads by type (image, audio, video) in PostDetailPanel
- Fix team membership save when editing own profile as superadmin
- Server: add approver_ids column to Posts, enrich GET/POST/PATCH responses

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

client/src/components/IssueCard.jsx

@@ -1,20 +1,12 @@
-const PRIORITY_CONFIG = {
-  low: { label: 'Low', dot: 'bg-text-tertiary' },
-  medium: { label: 'Medium', dot: 'bg-blue-500' },
-  high: { label: 'High', dot: 'bg-orange-500' },
-  urgent: { label: 'Urgent', dot: 'bg-red-500' },
-}
-
-const TYPE_LABELS = {
-  request: 'Request',
-  correction: 'Correction',
-  complaint: 'Complaint',
-  suggestion: 'Suggestion',
-  other: 'Other',
+const PRIORITY_DOTS = {
+  low: 'bg-text-tertiary',
+  medium: 'bg-blue-500',
+  high: 'bg-orange-500',
+  urgent: 'bg-red-500',
 }
 
 export default function IssueCard({ issue, onClick }) {
-  const priority = PRIORITY_CONFIG[issue.priority] || PRIORITY_CONFIG.medium
+  const priority = { dot: PRIORITY_DOTS[issue.priority] || PRIORITY_DOTS.medium }
 
   const formatDate = (dateStr) => {
     if (!dateStr) return ''