UI: approval detail page, agent hiring UX, costs breakdown, sidebar badges, and dashboard improvements

Add ApprovalDetail page with comment thread, revision request/resubmit flow,
and ApprovalPayload component for structured payload display. Extend AgentDetail
with permissions management, config revision history, and duplicate action.
Add agent hire dialog with permission-gated access. Rework Costs page with
per-agent breakdown table and period filtering. Add sidebar badge counts for
pending approvals and inbox items. Enhance Dashboard with live metrics and
sparkline trends. Extend Agents list with pending_approval status and bulk
actions. Update IssueDetail with approval linking. Various component improvements
to MetricCard, InlineEditor, CommentThread, and StatusBadge.

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

ui/src/api/sidebarBadges.ts

@@ -0,0 +1,6 @@
+import type { SidebarBadges } from "@paperclip/shared";
+import { api } from "./client";
+
+export const sidebarBadgesApi = {
+  get: (companyId: string) => api.get<SidebarBadges>(`/companies/${companyId}/sidebar-badges`),
+};