fix: update ITs to use consolidated init.sql, remove dead code

- All 7 ClickHouse integration tests now load init.sql via shared
  ClickHouseTestHelper instead of deleted V1-V11 migration files
- Remove unused useScope exports (setApp, setRoute, setExchange, clearScope)
- Remove unused CSS classes (monoCell, punchcardStack)
- Update ui/README.md DS version to v0.1.28

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/hooks/useScope.ts

@@ -36,33 +36,5 @@ export function useScope() {
     navigate(parts.join('/'));
   }, [navigate, scope.appId, scope.routeId]);
 
-  const setApp = useCallback((appId: string | undefined) => {
-    if (!appId) {
-      navigate(`/${tab}`);
-    } else {
-      navigate(`/${tab}/${appId}`);
-    }
-  }, [navigate, tab]);
-
-  const setRoute = useCallback((appId: string, routeId: string | undefined) => {
-    if (!routeId) {
-      navigate(`/${tab}/${appId}`);
-    } else {
-      navigate(`/${tab}/${appId}/${routeId}`);
-    }
-  }, [navigate, tab]);
-
-  const setExchange = useCallback((appId: string, routeId: string, exchangeId: string | undefined) => {
-    if (!exchangeId) {
-      navigate(`/${tab}/${appId}/${routeId}`);
-    } else {
-      navigate(`/${tab}/${appId}/${routeId}/${exchangeId}`);
-    }
-  }, [navigate, tab]);
-
-  const clearScope = useCallback(() => {
-    navigate(`/${tab}`);
-  }, [navigate, tab]);
-
-  return { scope, setTab, setApp, setRoute, setExchange, clearScope };
+  return { scope, setTab };
 }