fix: side peek des bases repasse en vanilla JS + largeur 1100px standard (v7.49.0)

- Panneau peek: les bindings Alpine (x-data absent du conteneur) rendaient
  loovverture et le redimensionnement inoperants -> cblage direct sur le document.
- Helper unique window.fdWirePeekResize (app.js): pointer capture, 300px-90vw,
  clic=fermer, largeur persiste fd_peek_width partagee entre les 4 peeks.
- database-table-container margin:0 (tableau colle a gauche, marge Library).
- .lib-container remonte dans app.css (trash etait pleine largeur), .db-index 1100px.
- ObsiGate verifie sans code: creation .xlsx OK (openpyxl, #186).

app/services/sync_engine.py

@@ -22,6 +22,7 @@ import logging
 import time
 
 from app.db import get_conn
+from app.services.collection_lifecycle import delete_collections
 
 logger = logging.getLogger(__name__)
 
@@ -381,7 +382,7 @@ class SyncEngine:
     def _mut_collection_delete(self, user_id: int, payload: dict) -> dict:
         cid = payload.get("collection_id")
         with get_conn() as conn:
-            conn.execute("DELETE FROM collections WHERE id=?", (cid,))
+            delete_collections(conn, [cid])
             conn.commit()
             return {"collection_id": cid, "server_version": None}