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.module.css

@@ -27,6 +27,7 @@
 }
 
 .rightPanel {
+  position: relative;
   flex: 1;
   display: flex;
   flex-direction: column;
@@ -43,3 +44,26 @@
   color: var(--text-muted);
   font-size: 0.875rem;
 }
+
+.closeBtn {
+  position: absolute;
+  top: 6px;
+  right: 8px;
+  z-index: 10;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 22px;
+  height: 22px;
+  border: none;
+  border-radius: var(--radius-sm);
+  background: transparent;
+  color: var(--text-muted);
+  cursor: pointer;
+  transition: background 0.1s, color 0.1s;
+}
+
+.closeBtn:hover {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+}

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}