[codex] Polish issue and operator workflow UI (#4090)

## Thinking Path

> - Paperclip operators spend much of their time in issues, inboxes,
selectors, and rich comment threads.
> - Small interaction problems in those surfaces slow down supervision
of AI-agent work.
> - The branch included related operator quality-of-life fixes for issue
layout, inbox actions, recent selectors, mobile inputs, and chat
rendering stability.
> - These changes are UI-focused and can land independently from
workspace navigation and access-profile work.
> - This pull request groups the operator QoL fixes into one standalone
branch.
> - The benefit is a more stable and efficient board workflow for issue
triage and task editing.

## What Changed

- Widened issue detail content and added a desktop inbox archive action.
- Fixed mobile text-field zoom by keeping touch input font sizes at
16px.
- Prioritized recent picker selections for assignees/projects in issue
and routine flows.
- Showed actionable approvals in the Mine inbox model.
- Fixed issue chat renderer state crashes and hardened tests.

## Verification

- `pnpm install --frozen-lockfile`
- `pnpm exec vitest run ui/src/components/IssueChatThread.test.tsx
ui/src/lib/inbox.test.ts ui/src/lib/recent-selections.test.ts`
- Split integration check: merged last after the other
[PAP-1614](/PAP/issues/PAP-1614) branches with no merge conflicts.
- Confirmed this branch does not include `pnpm-lock.yaml`.

## Risks

- Low to medium risk: mostly UI state, layout, and selection-priority
behavior.
- Visual layout and mobile zoom behavior may need browser/device QA
beyond component tests.
- No database migrations are included.

> 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-5.4 tool-enabled coding model, agentic
code-editing/runtime with local shell and GitHub CLI access; exact
context window and reasoning mode are not exposed by the Paperclip
harness.

## 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
- [x] 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

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Paperclip <noreply@paperclip.ing>

ui/src/lib/recent-selections.ts

@@ -0,0 +1,50 @@
+export const RECENT_SELECTION_DISPLAY_LIMIT = 3;
+const MAX_STORED_RECENT_SELECTIONS = 10;
+
+export function readRecentSelectionIds(storageKey: string): string[] {
+  try {
+    const raw = localStorage.getItem(storageKey);
+    if (!raw) return [];
+    const parsed = JSON.parse(raw);
+    return Array.isArray(parsed) ? parsed.filter((id): id is string => typeof id === "string") : [];
+  } catch {
+    return [];
+  }
+}
+
+export function trackRecentSelectionId(storageKey: string, id: string): void {
+  if (!id) return;
+  const recent = readRecentSelectionIds(storageKey).filter((candidate) => candidate !== id);
+  recent.unshift(id);
+  if (recent.length > MAX_STORED_RECENT_SELECTIONS) recent.length = MAX_STORED_RECENT_SELECTIONS;
+  localStorage.setItem(storageKey, JSON.stringify(recent));
+}
+
+export function orderItemsBySelectedAndRecent<T extends { id: string }>(
+  items: T[],
+  selectedId: string | null | undefined,
+  recentIds: string[],
+  recentLimit = RECENT_SELECTION_DISPLAY_LIMIT,
+): T[] {
+  const itemById = new Map(items.map((item) => [item.id, item]));
+  const ordered: T[] = [];
+  const seen = new Set<string>();
+
+  const push = (id: string | null | undefined) => {
+    if (id === null || id === undefined || seen.has(id)) return;
+    const item = itemById.get(id);
+    if (!item) return;
+    ordered.push(item);
+    seen.add(id);
+  };
+
+  push(selectedId);
+  for (const recentId of recentIds.slice(0, recentLimit)) {
+    push(recentId);
+  }
+  for (const item of items) {
+    push(item.id);
+  }
+
+  return ordered;
+}