refactor: consolidate breadcrumbs to single TopBar instance

Remove duplicate in-page breadcrumbs (ExchangeDetail, AgentHealth scope
trail) and improve the global TopBar breadcrumb with semantic labels and
a context-based override for pages with richer navigation data.

- Add BreadcrumbProvider from design system v0.1.12
- LayoutShell: label map prettifies URL segments (apps→Applications, etc.)
- ExchangeDetail: uses useBreadcrumb() to set semantic trail via context
- AgentHealth: remove scope trail, keep live-count badge standalone

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

ui/package-lock.json

@@ -8,7 +8,7 @@
       "name": "ui",
       "version": "0.0.0",
       "dependencies": {
-        "@cameleer/design-system": "^0.1.11",
+        "@cameleer/design-system": "^0.1.12",
         "@tanstack/react-query": "^5.90.21",
         "openapi-fetch": "^0.17.0",
         "react": "^19.2.4",
@@ -276,9 +276,9 @@
       }
     },
     "node_modules/@cameleer/design-system": {
-      "version": "0.1.11",
-      "resolved": "https://gitea.siegeln.net/api/packages/cameleer/npm/%40cameleer%2Fdesign-system/-/0.1.11/design-system-0.1.11.tgz",
-      "integrity": "sha512-u32cvvxOSwdDkL3WCiHjMZmdT+KxEcVWEYsg0zpm7CZmbwE98mlW1jZmIw7LRHLfdhb5jH6METRrsGsN6ke44g==",
+      "version": "0.1.12",
+      "resolved": "https://gitea.siegeln.net/api/packages/cameleer/npm/%40cameleer%2Fdesign-system/-/0.1.12/design-system-0.1.12.tgz",
+      "integrity": "sha512-7qXwa5UMzkN7OHCP+gVJYE53eeo/F2PYzt2XcmnsQpsoYcqlNdxmaf9Btl7wgkl1g5MbKGUxUlnlqAUkUbusAw==",
       "dependencies": {
         "react": "^19.0.0",
         "react-dom": "^19.0.0",