feat(5.12): modal editare + cont obligatoriu la import; design.md + PRD 5.13 revizuit (/autoplan)

5.12 (livrat): editare in modal a randurilor de preview, cont obligatoriu inainte de
import, formular editare extras (_form_editare, _editare_preview_modal), plus suita de
teste aferenta (preview edit/compact, mapare op, form editare, signup, admin panel).

Design + planificare:
- docs/design.md: sistem de design (tokeni, breakpoints, scara control, componente, a11y).
- docs/prd/prd-5.12-* si prd-5.13-* (5.13 cu raport /autoplan: CEO+Design+Eng, audit trail).

Curatare: sterse PNG-urile de test/mockup temporare din radacina.

Nota: implementarea CSS 5.13 (responsive compact + sistem butoane) NU e inca facuta —
planul revizuit cere refactorul testelor fragile din test_web_responsive.py INAINTE de CSS.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/config.py

@@ -61,6 +61,11 @@ class Settings(BaseSettings):
     # False (dev): cookie fara Secure, functioneaza pe HTTP.
     session_https_only: bool = False
 
+    # --- Contact suport (US-001, PRD 5.12) ---
+    # Email/canal de contact afisat in mesaje catre utilizatori (ex. CUI duplicat la signup).
+    # Nesetat -> fallback la formularea generica fara canal concret.
+    support_email: str | None = None
+
     # --- Notificare email admin la signup ---
     # Nesetat (smtp_host None) -> notificarea e DEGRADATA (doar log SIGNUP).
     smtp_host: str | None = None