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/pages/Org.tsx

@@ -69,6 +69,8 @@ function OrgTreeNode({
               ? "bg-green-400"
               : node.status === "paused"
                 ? "bg-yellow-400"
+                : node.status === "pending_approval"
+                  ? "bg-amber-400"
                 : node.status === "error"
                   ? "bg-red-400"
                   : "bg-neutral-400"