fix: nice-to-have polish — breadcrumbs, close button, status badges

- 7.1: Add deployment status badge (StatusDot + Badge) to AppsTab app
  list, sourced from catalog.deployment.status via slug lookup
- 7.3: Add X close button to top-right of exchange detail right panel
  in ExchangesPage (position:absolute, triggers handleClearSelection)
- 7.5: PunchcardHeatmap shows "Requires at least 2 days of data"
  when timeRangeMs < 2 days; DashboardL1 passes the range down
- 7.6: Command palette exchange results truncate IDs to ...{last8}
  matching the exchanges table display

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ui/src/pages/DashboardTab/DashboardL1.tsx

@@ -462,7 +462,7 @@ export default function DashboardL1() {
             />
           </Card>
           <Card title="7-Day Pattern">
-            <PunchcardHeatmap cells={punchcardData ?? []} />
+            <PunchcardHeatmap cells={punchcardData ?? []} timeRangeMs={timeRange.end.getTime() - timeRange.start.getTime()} />
           </Card>
         </div>
       )}