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/Exchanges/ExchangesPage.tsx

@@ -1,4 +1,5 @@
 import { useState, useMemo, useCallback, useRef, useEffect } from 'react';
+import { X } from 'lucide-react';
 import { useNavigate, useLocation, useParams } from 'react-router';
 import { useGlobalFilters, useToast } from '@cameleer/design-system';
 import { useExecutionDetail } from '../../api/queries/executions';
@@ -122,6 +123,9 @@ export default function ExchangesPage() {
       </div>
       <div className={styles.splitter} onPointerDown={handleSplitterDown} />
       <div className={styles.rightPanel} style={{ width: `${100 - splitPercent}%` }}>
+        <button className={styles.closeBtn} onClick={handleClearSelection} title="Close panel" aria-label="Close panel">
+          <X size={14} />
+        </button>
         <DiagramPanel
           appId={panelAppId}
           routeId={panelRouteId}