feat: outline SVG icons + version + workspaces in user menu

- _icons.html: 25 outline SVG icons (Feather/Lucide style, stroke=currentColor)
- base.html: toutes les icônes emoji remplacées par {{ fd_icon() }}
  - Sidebar sections, empty states, user menu, footer links, context menu
  - JS getSvgIcon() helper pour rendu dynamique
- User menu: ajout version (FlowDeck v4.0.3) + liste workspaces locaux
  - Entre Switch workspace et Log out, avec ✓ sur le workspace actif
- dashboard.py: _sidebar_data enrichi (app_version, local_workspaces)
- CSS: .page-icon-svg, .um-version, .um-section-label, .um-item svg
- Dark + light theme compatible (stroke:currentColor)
- 143 tests passent

app/routers/dashboard.py

@@ -173,8 +173,25 @@ def _sidebar_data(request: Request, repos: list[dict], include_workspace: bool =
         "gitea_linked": gitea_linked,
         "github_linked": github_linked,
         "has_active_workspace": has_active_workspace,
+        "app_version": "4.0.3",
     }
 
+    # List local workspaces for user menu
+    local_workspaces = []
+    if user:
+        try:
+            with get_conn() as conn:
+                ws_rows = conn.execute(
+                    "SELECT id, name FROM workspaces WHERE owner_id = ? ORDER BY name",
+                    (user["id"],)
+                ).fetchall()
+                local_workspaces = [{"id": r["id"], "name": r["name"]} for r in ws_rows]
+        except Exception:
+            pass
+    sidebar["local_workspaces"] = local_workspaces
+
+    return sidebar
+
 
 @router.get("/trash", response_class=HTMLResponse)
 async def trash_page(request: Request, owner: str = Query(default=""), repo: str = Query(default="")):