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/db.py

@@ -39,10 +39,19 @@ def init_db() -> None:
         seed_nomenclator_if_empty(conn)
         # Seed corpus operatii etichetate -> mapping_suggestions (SILVER, PRD 5.18 US-004).
         # Gated: OFF in teste (conftest), ON in productie. INSERT OR IGNORE -> idempotent.
+        # DOAR daca mapping_suggestions e gol: seedul are ~17k randuri; re-rularea lui pe
+        # FIECARE boot (API + worker concurent) tinea write-lock-ul indelung -> al doilea
+        # proces primea "database is locked" la pornire. Guard "_if_empty" (ca nomenclatorul)
+        # -> boot rapid cand e deja seeded. Re-seed dupa actualizarea fisierului = manual
+        # (goleste tabela), consistent cu semantica v1 ignore-not-upsert a seederului.
         if get_settings().seed_operatii_enabled:
-            from .operatii_seed import seed_operatii_etichetate
+            already = conn.execute(
+                "SELECT 1 FROM mapping_suggestions LIMIT 1"
+            ).fetchone()
+            if not already:
+                from .operatii_seed import seed_operatii_etichetate
 
-            seed_operatii_etichetate(conn)
+                seed_operatii_etichetate(conn)
         conn.commit()
     finally:
         conn.close()