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/components/StatusIcon.tsx

@@ -33,14 +33,14 @@ export function StatusIcon({ status, onChange, className }: StatusIconProps) {
   const circle = (
     <span
       className={cn(
-        "inline-flex items-center justify-center h-4 w-4 rounded-full border-2 shrink-0",
+        "relative inline-flex h-4 w-4 rounded-full border-2 shrink-0",
         colorClass,
         onChange && "cursor-pointer",
         className
       )}
     >
       {isDone && (
-        <span className={cn("h-2 w-2 rounded-full bg-current")} />
+        <span className="absolute inset-0 m-auto h-2 w-2 rounded-full bg-current" />
       )}
     </span>
   );