feat(content): v4.6.0 Content Blocks enrichis — Callout, TOC, Math (KaTeX), Toggle, Multi-colonnes

- Ajout blocs enrichis dans l'éditeur: callout (avec sélecteur d'emoji), table of contents (ancres), math (LaTeX/KaTeX), toggle lists (enfants collapsibles), multi-colonnes
- Intégration KaTeX 0.16.11 self-hosté (JS/CSS/fonts) — aucun CDN externe
- Rendu des nouveaux blocs dans les pages publiques (/p/<slug>): TOC, KaTeX, colonnes, toggle <details>
- Persistance 'children' (colonnes/toggle) + export Markdown étendu
- Sidebar customization par utilisateur (config API + colonne sidebar_config)
- Correctif test_views_calendar: parsing des query params year/month (le défaut ouvrait sur le mois courant)
- Tests: 184 passing

app/routers/sidebar_config.py

@@ -0,0 +1,115 @@
+"""FlowDeck — Sidebar customization API (v4.6.0)."""
+from __future__ import annotations
+
+import json
+import logging
+
+from fastapi import APIRouter, HTTPException, Request
+
+from app.db import get_conn
+from app.auth.session import SessionManager
+
+logger = logging.getLogger(__name__)
+router = APIRouter(tags=["sidebar"], prefix="/api/sidebar")
+
+
+def _get_user(request: Request) -> dict:
+    user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
+    if not user:
+        raise HTTPException(status_code=401, detail="Not authenticated")
+    return user
+
+
+DEFAULT_CONFIG = {
+    "workspace": {"visible": True, "order": 0, "show_count": None},
+    "gitea": {"visible": True, "order": 1, "show_count": None},
+    "meetings": {"visible": True, "order": 2, "show_count": 5},
+    "recents": {"visible": True, "order": 3, "show_count": 10},
+    "favorites": {"visible": True, "order": 4, "show_count": 10},
+    "agents": {"visible": True, "order": 5, "show_count": None},
+    "shared": {"visible": True, "order": 6, "show_count": 10},
+    "published": {"visible": True, "order": 7, "show_count": 10},
+    "private": {"visible": True, "order": 8, "show_count": None},
+}
+
+
+@router.get("/config")
+async def get_sidebar_config(request: Request):
+    """Get the current user's sidebar customization config."""
+    user = _get_user(request)
+    with get_conn() as conn:
+        row = conn.execute(
+            "SELECT sidebar_config FROM users WHERE id=?", (user["id"],)
+        ).fetchone()
+    if not row:
+        return {"config": DEFAULT_CONFIG}
+
+    raw = row["sidebar_config"]
+    if not raw:
+        return {"config": DEFAULT_CONFIG}
+
+    try:
+        stored = json.loads(raw)
+    except (json.JSONDecodeError, TypeError):
+        return {"config": DEFAULT_CONFIG}
+
+    # Merge with defaults to ensure all keys exist
+    merged = dict(DEFAULT_CONFIG)
+    merged.update(stored)
+    return {"config": merged}
+
+
+def get_sidebar_config_sync(user_id: int) -> dict:
+    """Synchronous helper to get sidebar config (used during template rendering)."""
+    with get_conn() as conn:
+        row = conn.execute(
+            "SELECT sidebar_config FROM users WHERE id=?", (user_id,)
+        ).fetchone()
+    if not row:
+        return dict(DEFAULT_CONFIG)
+    raw = row["sidebar_config"]
+    if not raw:
+        return dict(DEFAULT_CONFIG)
+    try:
+        stored = json.loads(raw)
+    except (json.JSONDecodeError, TypeError):
+        return dict(DEFAULT_CONFIG)
+    merged = dict(DEFAULT_CONFIG)
+    merged.update(stored)
+    return merged
+
+
+@router.put("/config")
+async def save_sidebar_config(request: Request):
+    """Save the current user's sidebar customization config."""
+    user = _get_user(request)
+    try:
+        body = await request.json()
+    except Exception:
+        raise HTTPException(status_code=400, detail="Invalid JSON body")
+
+    config = body.get("config")
+    if not config or not isinstance(config, dict):
+        raise HTTPException(status_code=400, detail="config object is required")
+
+    # Merge with defaults to ensure validity
+    merged = dict(DEFAULT_CONFIG)
+    for key, val in config.items():
+        if key in DEFAULT_CONFIG and isinstance(val, dict):
+            merged[key] = {
+                "visible": val.get("visible", DEFAULT_CONFIG[key]["visible"]),
+                "order": val.get("order", DEFAULT_CONFIG[key]["order"]),
+                "show_count": val.get("show_count", DEFAULT_CONFIG[key]["show_count"]),
+            }
+        elif key not in DEFAULT_CONFIG:
+            # Allow new custom sections
+            merged[key] = val
+
+    with get_conn() as conn:
+        conn.execute(
+            "UPDATE users SET sidebar_config=? WHERE id=?",
+            (json.dumps(merged), user["id"]),
+        )
+        conn.commit()
+
+    return {"status": "ok", "config": merged}