feat: complete evidence restructuring worktree

frontend/src/shell/AppShell.tsx

@@ -23,7 +23,6 @@ import { toast } from "sonner";
 import {
   closeSession, listSessions, resumeSession, getSession,
   renameSession, setSessionGroup, archiveSession, unarchiveSession, deleteSession, prewarmRuntime,
-  checkDwhHealth,
 } from "../api/sessions";
 import { logout as logoutUser } from "../api/auth";
 import {
@@ -129,23 +128,8 @@ export function AppShell({ canLogout }: AppShellProps) {
   const [stopConfirm, setStopConfirm] = useState(false);
   const [collapsedGroups, setCollapsedGroups] = useState<Record<string, boolean>>({});
   const [renameGroupTarget, setRenameGroupTarget] = useState<string | null>(null);
-  const [dwhDown, setDwhDown] = useState(false);
-  const [dwhChecking, setDwhChecking] = useState(true);
-  const [dwhCheckEpoch, setDwhCheckEpoch] = useState(0);
   const operationEpochRef = useRef(0);
   useEffect(() => () => { operationEpochRef.current += 1; }, []);
-  useEffect(() => {
-    let cancelled = false;
-    const operation = captureAuthOperation({ disposalEpoch: operationEpochRef.current });
-    if (!operation) return () => { cancelled = true; };
-    setDwhChecking(true);
-    checkDwhHealth().then((r) => {
-      if (cancelled || !isAuthOperationCurrent(operation, { disposalEpoch: operationEpochRef.current })) return;
-      setDwhDown(!r.ok);
-      setDwhChecking(false);
-    });
-    return () => { cancelled = true; };
-  }, [dwhCheckEpoch]);
 
   const groups = useMemo(
     () => [...new Set(sessions.map((s) => s.group).filter((g): g is string => !!g))].sort(),
@@ -958,26 +942,6 @@ export function AppShell({ canLogout }: AppShellProps) {
           }}
         />
       )}
-      {dwhDown && (
-        <Dialog open onOpenChange={() => {}}>
-          <DialogContent showCloseButton={false} className="sm:max-w-md">
-            <DialogHeader>
-              <DialogTitle>Connection unavailable</DialogTitle>
-              <DialogDescription>
-                The database is unreachable. Check the VPN connection and try again.
-              </DialogDescription>
-            </DialogHeader>
-            <DialogFooter>
-              <Button
-                disabled={dwhChecking}
-                onClick={() => setDwhCheckEpoch((e) => e + 1)}
-              >
-                {dwhChecking ? "Checking…" : "Retry"}
-              </Button>
-            </DialogFooter>
-          </DialogContent>
-        </Dialog>
-      )}
     </div>
   );
 }