Restructure ticket detail into tabs, add documents section

Ticket detail page now uses tabs (Details, Line Items, Notes, Photos &
Docs) instead of a long scrolling page. Photos section gains a Documents
category for uploading signed approvals, quotes, and receipts (accepts
PDFs). PDF generation button added to header (stub for now).

packages/admin/src/components/repairs/ticket-photos.tsx

@@ -26,6 +26,7 @@ const PHOTO_CATEGORIES = [
   { key: 'intake', label: 'Intake Photos', description: 'Condition at intake' },
   { key: 'in_progress', label: 'Work in Progress', description: 'During repair' },
   { key: 'completed', label: 'Completed', description: 'Final result' },
+  { key: 'document', label: 'Documents', description: 'Signed approvals, quotes, receipts' },
 ] as const
 
 interface TicketPhotosProps {
@@ -161,7 +162,7 @@ function PhotoSection({
       <input
         ref={fileInputRef}
         type="file"
-        accept="image/jpeg,image/png,image/webp"
+        accept={category === 'document' ? 'image/jpeg,image/png,image/webp,application/pdf' : 'image/jpeg,image/png,image/webp'}
         multiple
         className="hidden"
         onChange={handleUpload}