feat(5.16): aliniere lista/preview la mockup + fix lock seed la boot

Implementeaza planul aprobat din docs/raport-comparatie-mockup-5.16.md (T-1..T-9):

- T-1/T-8: rand lista 4->2 linii (placuta primar + cod RAR · operatie · data + pill),
  fallback placuta, eticheta-problema 10px->--fs-xs (_submissions.html, base.html)
- T-2: pill slim restilat fill-tint + dot 7px + text colorat per stare (base.html)
- T-3: bug 4a coliziune pill/vehicul in preview — col-stare 104->140px (base.html)
- T-4: preview 8->5 coloane (scos #, KM, Note; motivul -> title pe pill)
- T-5: titlu sectiune "Trimiterile tale" -> sr-only (a11y) + badge/export discret
- T-6: linia plan N/60 in corp doar pe avertizare; consum normal in badge+burger
- T-7: guard chenar gol chips extra (_chips_prestatii.html)
- T-9: "Anuleaza"->"Renunta"; nume operatie emfatic bold

Fix boot: init_db reincarca seedul de ~17k operatii (5.18) pe FIECARE pornire, pe
API + worker concurent -> "database is locked" la al doilea proces. Guard "_if_empty"
pe mapping_suggestions (ca seed_nomenclator_if_empty) -> boot rapid, fara cursa.

Teste actualizate (slim 2-linii, fallback placuta, plan in burger). TODOS.md:
defer trackuit (eroare HTMX lista, retokenizare px, diacritice).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/web/templates/_form_editare.html

@@ -103,8 +103,8 @@
 <div class="act-group" style="margin-top:14px;">
   <button type="submit" class="act act-primary" aria-label="{{ btn_label or 'Salveaza' }}">
     <span class="act-tx">{{ btn_label or 'Salveaza' }}</span>{{ icon('save') }}</button>
-  <button type="button" class="act" aria-label="{{ cancel_label or 'Anuleaza' }}" data-modal-close>
-    <span class="act-tx">{{ cancel_label or 'Anuleaza' }}</span>{{ icon('x') }}</button>
+  <button type="button" class="act" aria-label="{{ cancel_label or 'Renunta' }}" data-modal-close>
+    <span class="act-tx">{{ cancel_label or 'Renunta' }}</span>{{ icon('x') }}</button>
 </div>
 {% else %}
 <div style="margin-top:14px;">