[codex] Improve issue detail and issue-list UX (#3678)

## Thinking Path

> - Paperclip orchestrates AI agents for zero-human companies
> - A core part of that is the operator experience around reading issue
state, agent chat, and sub-task structure
> - The current branch had a long run of issue-detail and issue-list UX
fixes that all improve how humans follow and steer active work
> - Those changes mostly live in the UI/chat surface and should be
reviewed together instead of mixed with workspace/runtime work
> - This pull request packages the issue-detail, chat, markdown, and
sub-issue list improvements into one standalone change
> - The benefit is a cleaner, less jumpy, more reliable issue workflow
on desktop and mobile without coupling it to unrelated server/runtime
refactors

## What Changed

- Stabilized issue chat runtime wiring, optimistic comment handling,
queued-comment cancellation, and composer anchoring during live updates
- Fixed several issue-detail rendering and navigation regressions
including placeholder bleed, local polling scope, mobile inbox-to-issue
transitions, and visible refresh resets
- Improved markdown and rich-content handling with advisory image
normalization, editor fallback behavior, touch mention recovery, and
`issue:` quicklook links
- Refined sub-issue behavior with parent-derived defaults, current-user
inheritance fixes, empty-state cleanup, and a reusable issue-list
presentation for sub-issues
- Added targeted UI tests for the new issue-detail, chat scroll/message,
placeholder-data, markdown, and issue-list behaviors

## Verification

- `pnpm vitest run ui/src/components/IssueChatThread.test.tsx
ui/src/components/MarkdownEditor.test.tsx
ui/src/components/IssuesList.test.tsx
ui/src/context/LiveUpdatesProvider.test.tsx
ui/src/lib/issue-chat-messages.test.ts
ui/src/lib/issue-chat-scroll.test.ts
ui/src/lib/issue-detail-subissues.test.ts
ui/src/lib/query-placeholder-data.test.tsx
ui/src/hooks/usePaperclipIssueRuntime.test.tsx`

## Risks

- Medium: this branch touches the highest-traffic issue-detail UI paths,
so regressions would show up as chat/thread or sub-issue UX glitches
- The changes are UI-heavy and would benefit from reviewer screenshots
or a quick manual browser pass before merge

## Model Used

- OpenAI Codex coding agent (GPT-5-class runtime in Codex CLI; exact
deployed model ID is not exposed in this environment), reasoning
enabled, tool use and local code execution enabled

## 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 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
- [ ] 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

---------

Co-authored-by: Paperclip <noreply@paperclip.ing>

ui/src/components/CommentThread.test.tsx

@@ -178,6 +178,52 @@ describe("CommentThread", () => {
     });
   });
 
+  it("hides the reopen control and infers reopen for closed agent-assigned issues", async () => {
+    const root = createRoot(container);
+    const onAdd = vi.fn(async () => {});
+
+    act(() => {
+      root.render(
+        <MemoryRouter>
+          <CommentThread
+            comments={[]}
+            issueStatus="done"
+            currentAssigneeValue="agent:agent-1"
+            onAdd={onAdd}
+          />
+        </MemoryRouter>,
+      );
+    });
+
+    expect(container.textContent).not.toContain("Re-open");
+
+    const editor = container.querySelector('textarea[aria-label="Comment editor"]') as HTMLTextAreaElement | null;
+    const submitButton = Array.from(container.querySelectorAll("button")).find(
+      (element) => element.textContent === "Comment",
+    ) as HTMLButtonElement | undefined;
+    expect(editor).not.toBeNull();
+    expect(submitButton).toBeDefined();
+
+    act(() => {
+      const valueSetter = Object.getOwnPropertyDescriptor(
+        window.HTMLTextAreaElement.prototype,
+        "value",
+      )?.set;
+      valueSetter?.call(editor, "Please pick this back up");
+      editor?.dispatchEvent(new Event("input", { bubbles: true }));
+    });
+
+    await act(async () => {
+      submitButton?.click();
+    });
+
+    expect(onAdd).toHaveBeenCalledWith("Please pick this back up", true, undefined);
+
+    act(() => {
+      root.unmount();
+    });
+  });
+
   it("renders linked approvals inline in the timeline", () => {
     const root = createRoot(container);
     const agent: Agent = {