feat(web): add Fleet dashboard view for cross-instance observability

Adds a new /fleet route that shows a fleet-wide overview of all
configured Honcho instances. Each row renders per-instance metrics
(workspace count, total conclusions, queue activity, last seen, health)
by fanning out scoped fetches via createScopedClient, and aggregates
into top-level metric cards.

Reuses the Phase 2 scoped-client pattern. Extends compareQueries.ts
with useScopedQueueStatus and useScopedConclusionsCount, plus option
builders so useQueries can fan out per-workspace requests inside
FleetRow without duplicating query logic.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/web/src/routeTree.gen.ts

@@ -12,6 +12,7 @@ import { Route as rootRouteImport } from './routes/__root'
 import { Route as WorkspacesRouteImport } from './routes/workspaces'
 import { Route as SettingsRouteImport } from './routes/settings'
 import { Route as SeedKitsRouteImport } from './routes/seed-kits'
+import { Route as FleetRouteImport } from './routes/fleet'
 import { Route as ExploreRouteImport } from './routes/explore'
 import { Route as IndexRouteImport } from './routes/index'
 import { Route as WorkspacesWorkspaceIdRouteImport } from './routes/workspaces_.$workspaceId'
@@ -42,6 +43,11 @@ const SeedKitsRoute = SeedKitsRouteImport.update({
   path: '/seed-kits',
   getParentRoute: () => rootRouteImport,
 } as any)
+const FleetRoute = FleetRouteImport.update({
+  id: '/fleet',
+  path: '/fleet',
+  getParentRoute: () => rootRouteImport,
+} as any)
 const ExploreRoute = ExploreRouteImport.update({
   id: '/explore',
   path: '/explore',
@@ -126,6 +132,7 @@ const WorkspacesWorkspaceIdPeersPeerIdChatRoute =
 export interface FileRoutesByFullPath {
   '/': typeof IndexRoute
   '/explore': typeof ExploreRoute
+  '/fleet': typeof FleetRoute
   '/seed-kits': typeof SeedKitsRoute
   '/settings': typeof SettingsRoute
   '/workspaces': typeof WorkspacesRoute
@@ -145,6 +152,7 @@ export interface FileRoutesByFullPath {
 export interface FileRoutesByTo {
   '/': typeof IndexRoute
   '/explore': typeof ExploreRoute
+  '/fleet': typeof FleetRoute
   '/seed-kits': typeof SeedKitsRoute
   '/settings': typeof SettingsRoute
   '/workspaces': typeof WorkspacesRoute
@@ -165,6 +173,7 @@ export interface FileRoutesById {
   __root__: typeof rootRouteImport
   '/': typeof IndexRoute
   '/explore': typeof ExploreRoute
+  '/fleet': typeof FleetRoute
   '/seed-kits': typeof SeedKitsRoute
   '/settings': typeof SettingsRoute
   '/workspaces': typeof WorkspacesRoute
@@ -186,6 +195,7 @@ export interface FileRouteTypes {
   fullPaths:
     | '/'
     | '/explore'
+    | '/fleet'
     | '/seed-kits'
     | '/settings'
     | '/workspaces'
@@ -205,6 +215,7 @@ export interface FileRouteTypes {
   to:
     | '/'
     | '/explore'
+    | '/fleet'
     | '/seed-kits'
     | '/settings'
     | '/workspaces'
@@ -224,6 +235,7 @@ export interface FileRouteTypes {
     | '__root__'
     | '/'
     | '/explore'
+    | '/fleet'
     | '/seed-kits'
     | '/settings'
     | '/workspaces'
@@ -244,6 +256,7 @@ export interface FileRouteTypes {
 export interface RootRouteChildren {
   IndexRoute: typeof IndexRoute
   ExploreRoute: typeof ExploreRoute
+  FleetRoute: typeof FleetRoute
   SeedKitsRoute: typeof SeedKitsRoute
   SettingsRoute: typeof SettingsRoute
   WorkspacesRoute: typeof WorkspacesRoute
@@ -284,6 +297,13 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof SeedKitsRouteImport
       parentRoute: typeof rootRouteImport
     }
+    '/fleet': {
+      id: '/fleet'
+      path: '/fleet'
+      fullPath: '/fleet'
+      preLoaderRoute: typeof FleetRouteImport
+      parentRoute: typeof rootRouteImport
+    }
     '/explore': {
       id: '/explore'
       path: '/explore'
@@ -388,6 +408,7 @@ declare module '@tanstack/react-router' {
 const rootRouteChildren: RootRouteChildren = {
   IndexRoute: IndexRoute,
   ExploreRoute: ExploreRoute,
+  FleetRoute: FleetRoute,
   SeedKitsRoute: SeedKitsRoute,
   SettingsRoute: SettingsRoute,
   WorkspacesRoute: WorkspacesRoute,