fix(registratura): prevent duplicate numbers, add upload progress, submission lock, unified close/resolve, backdating support

- generateRegistryNumber: parse max existing number instead of counting entries
- addEntry: fetch fresh entries before generating number (race condition fix)
- Form: isSubmitting lock prevents double-click submission
- Form: uploadingCount tracks FileReader progress, blocks submit while uploading
- Form: submit button shows Loader2 spinner during save/upload
- CloseGuardDialog: added ClosureResolution selector (finalizat/aprobat-tacit/respins/retras/altele)
- ClosureBanner: displays resolution badge
- Types: ClosureResolution type, registrationDate field on RegistryEntry
- Date field renamed 'Data document' with tooltip explaining backdating
- Registry table shows '(înr. DATE)' when registrationDate differs from document date

src/modules/registratura/components/registry-table.tsx

@@ -71,7 +71,7 @@ export function RegistryTable({
         <thead>
           <tr className="border-b bg-muted/40">
             <th className="px-3 py-2 text-left font-medium">Nr.</th>
-            <th className="px-3 py-2 text-left font-medium">Data</th>
+            <th className="px-3 py-2 text-left font-medium">Data doc.</th>
             <th className="px-3 py-2 text-left font-medium">Dir.</th>
             <th className="px-3 py-2 text-left font-medium">Tip</th>
             <th className="px-3 py-2 text-left font-medium">Subiect</th>
@@ -103,6 +103,15 @@ export function RegistryTable({
                 </td>
                 <td className="px-3 py-2 text-xs whitespace-nowrap">
                   {formatDate(entry.date)}
+                  {entry.registrationDate &&
+                    entry.registrationDate !== entry.date && (
+                      <span
+                        className="block text-[10px] text-muted-foreground"
+                        title={`Înregistrat pe ${formatDate(entry.registrationDate)}`}
+                      >
+                        (înr. {formatDate(entry.registrationDate)})
+                      </span>
+                    )}
                 </td>
                 <td className="px-3 py-2">
                   <Badge