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/_status.html

@@ -137,10 +137,11 @@
        class="status-nav-link{% if _tab == 'mapari' %} status-nav-activ{% endif %}">Mapari{% if mapari_badge %}<span class="tab-badge" aria-hidden="true" style="display:inline-flex; align-items:center; justify-content:center; min-width:16px; height:16px; margin-left:4px; padding:0 4px; border-radius:99px; background:var(--err); color:#fff; font-size:11px; font-weight:700;">{{ mapari_badge }}</span>{% endif %}</a>
   </nav>
 
-  {# US-006 (5.17): linia de plan — consum/trial (secundar, sub navigatie, non-blocant).
-     Warn=culoare+text (accesibilitate): >=80% -> --warn; limita atinsa -> --err.
-     Ierarhie: nu concureaza cu stripul de sanatate (E zero-silent-failures pastrat). #}
-  {% if plan_linie is defined and plan_linie %}
+  {# US-006 (5.17) + T-6 (5.16): linia de plan in CORP apare DOAR in starea de avertizare
+     (>=80% -> --warn; limita atinsa -> --err). Consumul normal (N/60) traieste in badge-ul
+     din antet + linia din meniul burger, nu ca rand permanent in corp (densitate redusa).
+     Ierarhie: nu concureaza cu stripul de sanatate (zero-silent-failures pastrat). #}
+  {% if plan_linie and (plan_warn|default(false) or plan_limita_atinsa|default(false)) %}
   <div class="plan-status-line"
        style="font-size:var(--fs-sm); margin-top:6px; padding-top:6px;
               border-top:1px solid var(--line2);