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/pages/DashboardTab/DashboardTab.module.css

@@ -77,13 +77,6 @@
   gap: 16px;
 }
 
-/* Cells */
-.monoCell {
-  font-size: 12px;
-  font-family: var(--font-mono);
-  color: var(--text-primary);
-}
-
 .appNameCell {
   display: flex;
   align-items: center;
@@ -134,12 +127,6 @@
   gap: 16px;
 }
 
-.punchcardStack {
-  display: flex;
-  flex-direction: column;
-  gap: 16px;
-}
-
 /* Toggle button row */
 .toggleRow {
   display: flex;