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/web/templates/admin.html

@@ -60,7 +60,13 @@
                         {% if v == 'delete' %}onsubmit="return confirm('Stergi acest cont? (stergere soft)');"{% endif %}>
                     <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
                     <input type="hidden" name="account_id" value="{{ acct.id }}">
+                    {% if v == 'activate' and not acct.is_complete %}
+                    <button type="submit"{% if cls == 'danger' %} class="danger"{% endif %}
+                            disabled
+                            title="Completeaza datele firmei (companie + email + CUI) inainte de activare">{{ label }}</button>
+                    {% else %}
                     <button type="submit"{% if cls == 'danger' %} class="danger"{% endif %}>{{ label }}</button>
+                    {% endif %}
                   </form>
                 {% endfor %}
               </div>