[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/issue-properties-panel-key.test.ts

@@ -10,12 +10,17 @@ function createIssue(overrides: Partial<Issue> = {}) {
     assigneeAgentId: "agent-1",
     assigneeUserId: null,
     projectId: "project-1",
+    projectWorkspaceId: null,
     parentId: null,
     createdByUserId: "user-1",
     hiddenAt: null,
     labelIds: ["label-1"],
     executionPolicy: null,
     executionState: null,
+    executionWorkspaceId: null,
+    executionWorkspacePreference: null,
+    executionWorkspaceSettings: null,
+    currentExecutionWorkspace: null,
     blocks: [],
     blockedBy: [],
     ancestors: [],
@@ -44,4 +49,46 @@ describe("buildIssuePropertiesPanelKey", () => {
 
     expect(second).not.toBe(first);
   });
+
+  it("changes when workspace detail hydrates after opening from a cached issue", () => {
+    const first = buildIssuePropertiesPanelKey(createIssue(), []);
+    const second = buildIssuePropertiesPanelKey(
+      createIssue({
+        executionWorkspaceId: "workspace-1",
+        executionWorkspacePreference: "reuse_existing",
+        executionWorkspaceSettings: { mode: "isolated_workspace" },
+        currentExecutionWorkspace: {
+          id: "workspace-1",
+          companyId: "company-1",
+          projectId: "project-1",
+          projectWorkspaceId: "project-workspace-1",
+          sourceIssueId: "issue-1",
+          mode: "isolated_workspace",
+          strategyType: "git_worktree",
+          name: "PAP-1 workspace",
+          status: "active",
+          cwd: "/tmp/paperclip/PAP-1",
+          repoUrl: null,
+          baseRef: "master",
+          branchName: "PAP-1-workspace",
+          providerType: "git_worktree",
+          providerRef: "/tmp/paperclip/PAP-1",
+          derivedFromExecutionWorkspaceId: null,
+          lastUsedAt: new Date("2026-04-12T12:01:00.000Z"),
+          openedAt: new Date("2026-04-12T12:01:00.000Z"),
+          closedAt: null,
+          cleanupEligibleAt: null,
+          cleanupReason: null,
+          config: null,
+          metadata: null,
+          runtimeServices: [],
+          createdAt: new Date("2026-04-12T12:01:00.000Z"),
+          updatedAt: new Date("2026-04-12T12:01:00.000Z"),
+        },
+      }),
+      [],
+    );
+
+    expect(second).not.toBe(first);
+  });
 });