feat: sidebar exchange counts respect selected time range

The /routes/catalog endpoint now accepts optional from/to query
parameters instead of hardcoding a 24h window. The UI passes the
global filter time range so sidebar counts match what the user sees.

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

ui/src/components/LayoutShell.tsx

@@ -1,5 +1,5 @@
 import { Outlet, useNavigate, useLocation } from 'react-router';
-import { AppShell, Sidebar, TopBar, CommandPalette, CommandPaletteProvider, GlobalFilterProvider, ToastProvider, BreadcrumbProvider, useCommandPalette } from '@cameleer/design-system';
+import { AppShell, Sidebar, TopBar, CommandPalette, CommandPaletteProvider, GlobalFilterProvider, ToastProvider, BreadcrumbProvider, useCommandPalette, useGlobalFilters } from '@cameleer/design-system';
 import type { SidebarApp, SearchResult } from '@cameleer/design-system';
 import { useRouteCatalog } from '../api/queries/catalog';
 import { useAgents } from '../api/queries/agents';
@@ -89,7 +89,8 @@ function useDebouncedValue<T>(value: T, delayMs: number): T {
 function LayoutContent() {
   const navigate = useNavigate();
   const location = useLocation();
-  const { data: catalog } = useRouteCatalog();
+  const { timeRange } = useGlobalFilters();
+  const { data: catalog } = useRouteCatalog(timeRange.start.toISOString(), timeRange.end.toISOString());
   const { data: agents } = useAgents();
   const { username, logout } = useAuthStore();
   const { open: paletteOpen, setOpen: setPaletteOpen } = useCommandPalette();