feat: unified global search & filter system with Cmd-K navigation

Replace per-page filtering with a single GlobalFilterProvider (time range +
status) consumed by a redesigned TopBar across all pages. Lift CommandPalette
to App level so Cmd-K works globally with filtered results that navigate to
exchanges, routes, agents, and applications. Sidebar auto-reveals and selects
the target entry on Cmd-K navigation via location state.

- Extract shared time preset utilities (computePresetRange, DEFAULT_PRESETS)
- Add GlobalFilterProvider (time range + status) and CommandPaletteProvider
- Add TimeRangeDropdown primitive with Popover preset list
- Redesign TopBar: breadcrumb | time dropdown | status pills | search | env
- Add application category to Cmd-K search
- Remove FilterBar and local DateRangePicker from Dashboard/Metrics pages
- Filter AgentHealth EventFeed by global time range
- Remove shift/onSearchClick props from TopBar

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

src/mocks/searchData.tsx

@@ -0,0 +1,98 @@
+import type { SearchResult } from '../design-system/composites/CommandPalette/types'
+import { exchanges, type Exchange } from './exchanges'
+import { routes } from './routes'
+import { agents } from './agents'
+import { SIDEBAR_APPS, type SidebarApp } from './sidebar'
+
+function formatDuration(ms: number): string {
+  if (ms >= 60_000) return `${(ms / 1000).toFixed(0)}s`
+  if (ms >= 1000) return `${(ms / 1000).toFixed(2)}s`
+  return `${ms}ms`
+}
+
+function statusLabel(status: Exchange['status']): string {
+  switch (status) {
+    case 'completed': return 'OK'
+    case 'failed': return 'ERR'
+    case 'running': return 'RUN'
+    case 'warning': return 'WARN'
+  }
+}
+
+function statusToVariant(status: Exchange['status']): string {
+  switch (status) {
+    case 'completed': return 'success'
+    case 'failed': return 'error'
+    case 'running': return 'running'
+    case 'warning': return 'warning'
+  }
+}
+
+function formatTimestamp(date: Date): string {
+  return date.toLocaleTimeString('en-GB', { hour: '2-digit', minute: '2-digit', second: '2-digit' })
+}
+
+function healthToColor(health: SidebarApp['health']): string {
+  switch (health) {
+    case 'live': return 'success'
+    case 'stale': return 'warning'
+    case 'dead': return 'error'
+  }
+}
+
+export function buildSearchData(
+  exs: Exchange[] = exchanges,
+  rts: typeof routes = routes,
+  ags: typeof agents = agents,
+  apps: SidebarApp[] = SIDEBAR_APPS,
+): SearchResult[] {
+  const results: SearchResult[] = []
+
+  for (const app of apps) {
+    const liveAgents = app.agents.filter((a) => a.status === 'live').length
+    results.push({
+      id: app.id,
+      category: 'application',
+      title: app.name,
+      badges: [{ label: app.health.toUpperCase(), color: healthToColor(app.health) }],
+      meta: `${app.routes.length} routes · ${app.agents.length} agents (${liveAgents} live) · ${app.exchangeCount.toLocaleString()} exchanges`,
+      path: `/apps/${app.id}`,
+    })
+  }
+
+  for (const exec of exs) {
+    results.push({
+      id: exec.id,
+      category: 'exchange',
+      title: `${exec.orderId} — ${exec.route}`,
+      badges: [{ label: statusLabel(exec.status), color: statusToVariant(exec.status) }],
+      meta: `${exec.correlationId} · ${formatDuration(exec.durationMs)} · ${exec.customer}`,
+      timestamp: formatTimestamp(exec.timestamp),
+      path: `/exchanges/${exec.id}`,
+    })
+  }
+
+  for (const route of rts) {
+    results.push({
+      id: route.id,
+      category: 'route',
+      title: route.name,
+      badges: [{ label: route.group }],
+      meta: `${route.exchangeCount.toLocaleString()} exchanges · ${route.successRate}% success`,
+      path: `/routes/${route.id}`,
+    })
+  }
+
+  for (const agent of ags) {
+    results.push({
+      id: agent.id,
+      category: 'agent',
+      title: agent.name,
+      badges: [{ label: agent.status }],
+      meta: `${agent.service} ${agent.version} · ${agent.tps} · ${agent.lastSeen}`,
+      path: `/agents/${agent.appId}/${agent.id}`,
+    })
+  }
+
+  return results
+}