UI: Identity component, LiveRunWidget, issue identifiers, and UX improvements

Add Identity component (avatar + name) used across agent/issue displays. Add
LiveRunWidget for real-time streaming of active heartbeat runs on issue detail
pages via WebSocket. Display issue identifiers (PAP-42) instead of UUID
fragments throughout Issues, Inbox, CommandPalette, and detail pages.
Enhance CommentThread with re-open checkbox, Cmd+Enter submit, sorted display,
and run linking. Improve Activity page with richer formatting and filtering.
Update Dashboard with live metrics. Add reports-to agent link in AgentProperties.
Various small fixes: StatusIcon centering, CopyText ref init, agent detail
run-issue cross-links.

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

ui/src/api/issues.ts

@@ -15,5 +15,6 @@ export const issuesApi = {
     }),
   release: (id: string) => api.post<Issue>(`/issues/${id}/release`, {}),
   listComments: (id: string) => api.get<IssueComment[]>(`/issues/${id}/comments`),
-  addComment: (id: string, body: string) => api.post<IssueComment>(`/issues/${id}/comments`, { body }),
+  addComment: (id: string, body: string, reopen?: boolean) =>
+    api.post<IssueComment>(`/issues/${id}/comments`, reopen === undefined ? { body } : { body, reopen }),
 };