fix: A25 + A21 (partiel) — plus d'exception muque, transaction protégée (v7.3.8)

- A25 — 84 `except Exception: pass/…` → `logger.exception("<fonction>")`
  (19 fichiers : api_v2 30, dashboard 10, board 7, sites 5, workspace 5,
  api_v2_helpers 5, …) ; `logger` ajouté là où il manquait (api_v2_helpers,
  sites + `import logging`)
- A25 critique — les `try` autour de `materialize_properties` supprimés dans
  `create_collection_v2` ET `apply_db_template_v2` : un échec interrompt la
  transaction au lieu de commiter une collection sans schéma
- test `test_collection_rollback_when_materialize_fails` (Bearer v2, monkeypatch
  qui lève, assertions : RuntimeError + 0 ligne commitée)
- A21 partiel — `PRAGMA busy_timeout=5000` dans `get_conn()` (point d'entrée
  unique) ; commentaire `ponytail:` : le wrapper async + les 510 call sites
  restent à migrer module par module
- suite **1028/1028** · `ruff check app tests` OK

app/routers/dashboard.py

@@ -52,7 +52,7 @@ def _get_user_or_redirect(request: Request):
                 if count == 0:
                     return {"id": 1, "login": "admin", "full_name": "Admin", "is_admin": True}
         except Exception:
-            pass
+            logger.exception("_get_user_or_redirect")
         return RedirectResponse("/auth/login?provider=local&expired=1", status_code=302)
     return user
 
@@ -88,7 +88,7 @@ def _sidebar_data(request: Request, repos: list[dict], include_workspace: bool =
                     avatar_url = row["avatar_url"] or ""
                     avatar_color = row["avatar_color"] or "#3A3A3A"
         except Exception:
-            pass
+            logger.exception("_sidebar_data")
 
     recent_pages = []
     for repo in repos[:10]:
@@ -179,7 +179,7 @@ def _sidebar_data(request: Request, repos: list[dict], include_workspace: bool =
                     elif t["provider"] == "github":
                         github_linked = True
         except Exception:
-            pass
+            logger.exception("_sidebar_data")
 
     # Get local workspace ID for Gitea workspace mirror
     local_ws_id = 0
@@ -193,7 +193,7 @@ def _sidebar_data(request: Request, repos: list[dict], include_workspace: bool =
                 if row:
                     local_ws_id = row["id"]
         except Exception:
-            pass
+            logger.exception("_sidebar_data")
 
     # Private pages for mirror workspace (when Gitea remote active)
     private_pages = []
@@ -206,7 +206,7 @@ def _sidebar_data(request: Request, repos: list[dict], include_workspace: bool =
                 ).fetchall()
                 private_pages = [{"id": r[0], "title": r[1] or "Untitled"} for r in pp_rows]
         except Exception:
-            pass
+            logger.exception("_sidebar_data")
 
     # Shared / received / published pages for the sidebar (Par moi / Avec moi)
     shared_made_pages = []
@@ -771,7 +771,7 @@ async def dashboard(
                     template = env.get_template("landing.html")
                     return template.render()
         except Exception:
-            pass
+            logger.exception("dashboard")
         from app.templating import ENV
         env = ENV
         template = env.get_template("landing.html")
@@ -788,7 +788,7 @@ async def dashboard(
             ).fetchone()
             has_gitea = bool(tok)
     except Exception:
-        pass
+        logger.exception("dashboard")
 
     if not has_gitea:
         # Check if user has any workspace
@@ -801,7 +801,7 @@ async def dashboard(
                     # v5.2.0: first-launch → onboarding wizard
                     return RedirectResponse("/welcome", status_code=302)
         except Exception:
-            pass
+            logger.exception("dashboard")
         return RedirectResponse("/local-workspace", status_code=302)
 
     # ── Gitea user → full dashboard ──
@@ -942,7 +942,7 @@ async def list_workspace_projects(request: Request):
                     "forge": "gitea",
                 })
         except Exception:
-            pass
+            logger.exception("list_workspace_projects")
 
     return {"builtin": builtin, "gitea": gitea_repos, "github": []}
 
@@ -2097,7 +2097,7 @@ async def add_item_tag(request: Request, item_id: int):
             )
             conn.commit()
         except Exception:
-            pass
+            logger.exception("add_item_tag")
 
     return {"tag": {"id": tag["id"], "name": tag["name"], "color": tag["color"]}}