feat(ui): add auth pages, company rail, inbox redesign, and page improvements

Add Auth sign-in/sign-up page and InviteLanding page for invite acceptance.
Add CloudAccessGate that checks deployment mode and redirects to /auth when
session is required. Add CompanyRail with drag-and-drop company switching.
Add MarkdownBody prose renderer. Redesign Inbox with category filters and
inline join-request approval. Refactor AgentDetail to overview/configure/runs
views with claude-login support. Replace navigate() anti-patterns with <Link>
components in Dashboard and MetricCard. Add live-run indicators in sidebar
agents. Fix LiveUpdatesProvider cache key resolution for issue identifiers.
Add auth, health, and access API clients.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/lib/queryKeys.ts

@@ -14,6 +14,8 @@ export const queryKeys = {
   },
   issues: {
     list: (companyId: string) => ["issues", companyId] as const,
+    listByProject: (companyId: string, projectId: string) =>
+      ["issues", companyId, "project", projectId] as const,
     detail: (id: string) => ["issues", "detail", id] as const,
     comments: (issueId: string) => ["issues", "comments", issueId] as const,
     attachments: (issueId: string) => ["issues", "attachments", issueId] as const,
@@ -38,6 +40,15 @@ export const queryKeys = {
     comments: (approvalId: string) => ["approvals", "comments", approvalId] as const,
     issues: (approvalId: string) => ["approvals", "issues", approvalId] as const,
   },
+  access: {
+    joinRequests: (companyId: string, status: string = "pending_approval") =>
+      ["access", "join-requests", companyId, status] as const,
+    invite: (token: string) => ["access", "invite", token] as const,
+  },
+  auth: {
+    session: ["auth", "session"] as const,
+  },
+  health: ["health"] as const,
   secrets: {
     list: (companyId: string) => ["secrets", companyId] as const,
     providers: (companyId: string) => ["secret-providers", companyId] as const,