feat(5.15+5.14): CLOSE — fix-uri code-review + embeddings functional

5.15 (propagare design + dashboard editare) si 5.14 (mapare LLM distilata)
inchise dupa /code-review high. 8 buguri reparate TDD:

- HIGH modal nu se deschidea pe randul slim (base.html: trimitere-slim)
- HIGH /repune trunchia prestatii (declaratie incompleta la RAR) -> iterare
  peste existing, codes pozitional
- HIGH embeddings incarca model ~230MB degeaba pe corpus gol -> poarta has_corpus()
- HIGH picker chips gol pe re-render eroare -> conn/account_id pe toate ramurile
- MED obs re-derivat dupa stergere explicita -> _merge_override pastreaza obs=''
- MED mapare salvata fara denumire poluă GOLD -> _record_gold_validation guard
- MED typo nome_prestatie -> nume_prestatie in select /repune
- MED bucketare timp +3h gresita iarna -> SQLite localtime + TZ=Europe/Bucharest

Embeddings WIRE-uit functional (PRD #15, decizie user): ensure_embeddings_corpus
construieste corpus din nomenclator, gated pe AUTOPASS_EMBEDDINGS_ENABLED (default
off). Marime model corectata ~50MB->~230MB (estimare PRD gresita).

Cleanup: hoist load_* din bucla bulk-fix; import re la top.
Regresie: 1256 passed, 1 deselected (live), 0 failed.

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

app/web/templates/_mapari.html

@@ -37,7 +37,8 @@
       <tbody>
       {% for e in pending %}
       {% set top = e.suggestions[0] if e.suggestions else None %}
-      {% set preselect = top.cod_prestatie if (top and top.score >= 60) else '' %}
+      {# L14-S6: pre-selectare din sugestie_principala (GOLD/SILVER/embedding) > fuzzy #}
+      {% set preselect = e.sugestie_principala.cod_prestatie if e.sugestie_principala else (top.cod_prestatie if (top and top.score >= 60) else '') %}
         {# data-dt-row = haystack de cautare (randul contine un <select> cu tot nomenclatorul). #}
         <tr data-dt-row="{{ e.cod_op_service }} {{ e.denumire or '' }}
             {%- for s in e.suggestions[:3] %} {{ s.cod_prestatie }}{% endfor %}">
@@ -45,6 +46,8 @@
             <form id="map-rez-{{ loop.index }}" hx-post="/mapari" hx-target="#mapari-section" hx-swap="outerHTML">
               <input type="hidden" name="csrf_token" value="{{ csrf_token or '' }}">
               <input type="hidden" name="cod_op_service" value="{{ e.cod_op_service }}">
+              {# L14-S6: denumire pt record_human_validation in GOLD partajat #}
+              <input type="hidden" name="denumire" value="{{ e.denumire or '' }}">
             </form>
             <div><strong>{{ e.cod_op_service }}</strong>
               <span class="pill" title="submission-uri blocate">{{ e.blocked }} blocate</span></div>