feat(gateway,ui): quiet Where picker, placement chip, and projects read model (#120804)

* feat(gateway): projects.list groups known checkouts by repo identity

Implements docs/plan/runners.md milestone 4 derived projects read model.

* feat(ui): regroup the Where picker by gateway, devices, and cloud

* feat(ui): placement chip shows where a session runs with reclaim

Implements docs/plan/runners.md milestone 4 placement display and reclaim.

scripts/protocol-gen-kotlin.ts

@@ -60,6 +60,7 @@ const schemaNames = new Map<string, string>([
   ["WorkerDesktopObserveResult", "WorkerDesktopObserveResult"],
   ["WorkerDesktopLaunchParams", "WorkerDesktopLaunchParams"],
   ["WorkerDesktopLaunchResult", "WorkerDesktopLaunchResult"],
+  ["ProjectsListResult", "ProjectsListResult"],
 ]);
 
 const androidEnums: EnumSpec[] = [