[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/lib/optimistic-issue-runs.test.ts

@@ -1,7 +1,8 @@
 import { describe, expect, it } from "vitest";
+import type { Issue } from "@paperclipai/shared";
 import type { RunForIssue } from "../api/activity";
 import type { ActiveRunForIssue, LiveRunForIssue } from "../api/heartbeats";
-import { removeLiveRunById, upsertInterruptedRun } from "./optimistic-issue-runs";
+import { clearIssueExecutionRun, removeLiveRunById, upsertInterruptedRun } from "./optimistic-issue-runs";
 
 function createLiveRun(overrides: Partial<LiveRunForIssue> = {}): LiveRunForIssue {
   return {
@@ -91,3 +92,32 @@ describe("removeLiveRunById", () => {
     expect(runs?.map((run) => run.id)).toEqual(["run-2"]);
   });
 });
+
+describe("clearIssueExecutionRun", () => {
+  it("clears the cached execution run when the interrupted run matches the issue lock", () => {
+    const issue = {
+      id: "issue-1",
+      executionRunId: "run-1",
+      executionAgentNameKey: "codexcoder",
+      executionLockedAt: new Date("2026-04-08T21:00:00.000Z"),
+      updatedAt: new Date("2026-04-08T21:00:00.000Z"),
+    } as Issue;
+
+    expect(clearIssueExecutionRun(issue, "run-1")).toMatchObject({
+      id: "issue-1",
+      executionRunId: null,
+      executionAgentNameKey: null,
+      executionLockedAt: null,
+    });
+  });
+
+  it("leaves the cached issue alone when another run is interrupted", () => {
+    const issue = {
+      id: "issue-1",
+      executionRunId: "run-2",
+      executionAgentNameKey: "codexcoder",
+    } as Issue;
+
+    expect(clearIssueExecutionRun(issue, "run-1")).toBe(issue);
+  });
+});