[codex] Polish issue board workflows (#4224)

## Thinking Path

> - Paperclip orchestrates AI agents for zero-human companies
> - Human operators supervise that work through issue lists, issue
detail, comments, inbox groups, markdown references, and
profile/activity surfaces
> - The branch had many small UI fixes that improve the operator loop
but do not need to ship with backend runtime migrations
> - These changes belong together as board workflow polish because they
affect scanning, navigation, issue context, comment state, and markdown
clarity
> - This pull request groups the UI-only slice so it can merge
independently from runtime/backend changes
> - The benefit is a clearer board experience with better issue context,
steadier optimistic updates, and more predictable keyboard navigation

## What Changed

- Improves issue properties, sub-issue actions, blocker chips, and issue
list/detail refresh behavior.
- Adds blocker context above the issue composer and stabilizes
queued/interrupted comment UI state.
- Improves markdown issue/GitHub link rendering and opens external
markdown links in a new tab.
- Adds inbox group keyboard navigation and fold/unfold support.
- Polishes activity/avatar/profile/settings/workspace presentation
details.

## Verification

- `pnpm exec vitest run ui/src/components/IssueProperties.test.tsx
ui/src/components/IssueChatThread.test.tsx
ui/src/components/MarkdownBody.test.tsx ui/src/lib/inbox.test.ts
ui/src/lib/optimistic-issue-comments.test.ts`

## Risks

- Low to medium risk: changes are UI-focused but cover high-traffic
issue and inbox surfaces.
- This branch intentionally does not include the backend runtime changes
from the companion PR; where UI calls newer API filters, unsupported
servers should continue to fail visibly through existing API error
handling.
- Visual screenshots were not captured in this heartbeat; targeted
component/helper tests cover the changed behavior.

> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.

## Model Used

- OpenAI Codex, GPT-5-based coding agent runtime, shell/git tool use
enabled. Exact hosted model build and context window are not exposed in
this Paperclip heartbeat environment.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [ ] If this change affects the UI, I have included before/after
screenshots
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] I will address all Greptile and reviewer comments before
requesting merge

ui/src/pages/UserProfile.tsx

@@ -14,6 +14,7 @@ import { queryKeys } from "../lib/queryKeys";
 import {
   formatCents,
   formatDate,
+  formatNumber,
   formatShortDate,
   formatTokens,
   issueUrl,
@@ -59,10 +60,10 @@ function WindowColumn({ stats }: { stats: UserProfileWindowStats }) {
       </div>
 
       <div className="grid grid-cols-2 gap-x-5 gap-y-3">
-        <Metric value={String(stats.touchedIssues)} label="Touched" />
-        <Metric value={String(stats.completedIssues)} label="Completed" />
-        <Metric value={String(stats.commentCount)} label="Comments" />
-        <Metric value={String(stats.activityCount)} label="Actions" />
+        <Metric value={formatNumber(stats.touchedIssues)} label="Touched" />
+        <Metric value={formatNumber(stats.completedIssues)} label="Completed" />
+        <Metric value={formatNumber(stats.commentCount)} label="Comments" />
+        <Metric value={formatNumber(stats.activityCount)} label="Actions" />
       </div>
 
       <div className="grid grid-cols-2 gap-x-5 gap-y-1.5 pt-3 text-xs tabular-nums text-muted-foreground">
@@ -71,9 +72,9 @@ function WindowColumn({ stats }: { stats: UserProfileWindowStats }) {
         <span>Spend</span>
         <span className="text-right text-foreground">{formatCents(stats.costCents)}</span>
         <span>Created</span>
-        <span className="text-right text-foreground">{stats.createdIssues}</span>
+        <span className="text-right text-foreground">{formatNumber(stats.createdIssues)}</span>
         <span>Open</span>
-        <span className="text-right text-foreground">{stats.assignedOpenIssues}</span>
+        <span className="text-right text-foreground">{formatNumber(stats.assignedOpenIssues)}</span>
       </div>
     </div>
   );
@@ -283,9 +284,9 @@ export function UserProfile() {
 
         <div className="grid gap-6 sm:grid-cols-2 lg:grid-cols-4">
           <HeroStat label="All-time tokens" value={formatTokens(allTimeTokens)} hint={formatCents(allTime?.costCents ?? 0) + " spent"} />
-          <HeroStat label="Completed" value={String(allTime?.completedIssues ?? 0)} hint={allTime ? `${completionRate(allTime)} rate` : undefined} />
-          <HeroStat label="Open assigned" value={String(allTime?.assignedOpenIssues ?? 0)} hint={`${allTime?.createdIssues ?? 0} created`} />
-          <HeroStat label="7-day actions" value={String(last7?.activityCount ?? 0)} hint={`${last7?.commentCount ?? 0} comments`} />
+          <HeroStat label="Completed" value={formatNumber(allTime?.completedIssues ?? 0)} hint={allTime ? `${completionRate(allTime)} rate` : undefined} />
+          <HeroStat label="Open assigned" value={formatNumber(allTime?.assignedOpenIssues ?? 0)} hint={`${formatNumber(allTime?.createdIssues ?? 0)} created`} />
+          <HeroStat label="7-day actions" value={formatNumber(last7?.activityCount ?? 0)} hint={`${formatNumber(last7?.commentCount ?? 0)} comments`} />
         </div>
       </section>