feat(registratura): rework with company-prefixed numbering, directions, deadlines, attachments

- Company-specific numbering (B-0001/2026, US-0001/2026, SDT-0001/2026)
- Direction: Intrat/Ieșit replaces old 3-way type
- 9 document types: Contract, Ofertă, Factură, Scrisoare, etc.
- Status simplified to Deschis/Închis with cascade close for linked entries
- Address Book autocomplete for sender/recipient
- Deadline tracking with overdue day counter
- File attachment support (base64 encoding)
- Linked entries system

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

src/modules/registratura/services/registry-service.ts

@@ -1,3 +1,4 @@
+import type { CompanyId } from '@/core/auth/types';
 import type { RegistryEntry } from '../types';
 
 const STORAGE_PREFIX = 'entry:';
@@ -30,9 +31,44 @@ export async function deleteEntry(storage: RegistryStorage, id: string): Promise
   await storage.delete(`${STORAGE_PREFIX}${id}`);
 }
 
-export function generateRegistryNumber(date: string, index: number): string {
+const COMPANY_PREFIXES: Record<CompanyId, string> = {
+  beletage: 'B',
+  'urban-switch': 'US',
+  'studii-de-teren': 'SDT',
+  group: 'G',
+};
+
+/**
+ * Generate company-specific registry number: B-0001/2026
+ * Uses the next sequential number for that company in that year.
+ */
+export function generateRegistryNumber(
+  company: CompanyId,
+  date: string,
+  existingEntries: RegistryEntry[]
+): string {
   const d = new Date(date);
   const year = d.getFullYear();
-  const padded = String(index).padStart(4, '0');
-  return `${padded}/${year}`;
+  const prefix = COMPANY_PREFIXES[company];
+
+  // Count existing entries for this company in this year
+  const sameCompanyYear = existingEntries.filter((e) => {
+    const entryYear = new Date(e.date).getFullYear();
+    return e.company === company && entryYear === year;
+  });
+
+  const nextIndex = sameCompanyYear.length + 1;
+  const padded = String(nextIndex).padStart(4, '0');
+  return `${prefix}-${padded}/${year}`;
+}
+
+/** Calculate days overdue (negative = days remaining, positive = overdue) */
+export function getOverdueDays(deadline: string | undefined): number | null {
+  if (!deadline) return null;
+  const now = new Date();
+  now.setHours(0, 0, 0, 0);
+  const dl = new Date(deadline);
+  dl.setHours(0, 0, 0, 0);
+  const diff = now.getTime() - dl.getTime();
+  return Math.floor(diff / (1000 * 60 * 60 * 24));
 }