fix(app): keep thinking picker clicks active

[Astro-Han]

Summary

Fix the prompt model picker so reasoning-effort options inside the nested thinking-level popover can be clicked and applied.

This PR adds stable test selectors for the thinking-level trigger/options and covers the user path with a focused Playwright E2E test.

Why

Closes #701.

The affected session export showed backend requests were still using openai / gpt-5.5 / variant xhigh, so the session had not actually downgraded its model variant. The failure was in the frontend interaction layer: moving focus into the nested thinking-level popover was treated as focus outside by the outer model selector popover. That closed the outer picker before the inner option click could run, so model.variant.set(...) never applied.

Related Issue

Closes #701

Human Review Status

Pending. A human should make the final merge decision after reviewing the final diff and verification evidence.

Review Focus

Please check that the focus outside guard is scoped tightly to nested picker content and does not weaken normal outside-click dismissal for the model selector.

Risk Notes

Low. The change is limited to prompt model picker dismissal behavior and a focused E2E regression test. No provider, model-routing, persistence, or generated snapshot changes are included.

How To Verify

Focused E2E: passed
PLAYWRIGHT_PORT=3127 PLAYWRIGHT_SERVER_PORT=4127 bun run test:e2e e2e/models/model-picker-thinking.spec.ts

Typecheck: passed
bun run typecheck

Diff check: passed
git diff --check

Manual Electron check: passed
bun run dev:desktop, then opened the prompt model picker, opened the thinking-level submenu, selected 超高, and confirmed the bottom model control and picker row updated to GPT-5.5 超高 / 思考档位 超高.

Screenshots or Recordings

Not attached. This is a transient picker interaction-state fix; the visible path was checked manually in Electron and is covered by the focused E2E test above.

Checklist

• Human review status is stated above as pending, approved, or not required
• I linked the related issue, or stated why there is no issue
• This PR has exactly one type label (bug, enhancement, task, or documentation), at least one primary routing label (app, ui, platform, harness, or ci), and exactly one priority label (P0 to P3), or I requested maintainer labeling
• I described the review focus and any meaningful risks
• I listed the relevant verification steps and the key result for each
• I did not introduce unrelated refactors, dependencies, generated files, or file changes beyond the stated scope
• I manually checked visible UI or copy changes when needed, with screenshots or recordings
• I considered macOS and Windows impact for platform, packaging, updater, signing, paths, shell, or permissions changes
• I called out docs, release notes, dependencies, permissions, credentials, deletion behavior, generated content, or local file changes when relevant
• I reviewed the final diff for unrelated changes and suspicious dependency changes
• I am targeting dev, and my PR title and commit messages use Conventional Commits in English

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: d8730383-5a51-41e2-b0b9-70bf4e89cca2

📥 Commits

Reviewing files that changed from the base of the PR and between 1981523 and 3047f10.

📒 Files selected for processing (3)

• packages/app/e2e/models/model-picker-thinking.spec.ts
• packages/app/src/components/prompt-input/model-picker.tsx
• packages/opencode/test/config/e2e-smoke-tagging.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-model-reasoning-variant

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[github-actions]

Suggested priority: P2 (includes user-path files (packages/app/src/components/prompt-input/model-picker.tsx)).

P1/P0 are reserved for maintainer confirmation. Please relabel manually if this is a release blocker, security issue, data-loss risk, or updater/runtime failure.

[gemini-code-assist]

Code Review

This pull request introduces a new E2E test for the 'thinking' model variant selection and adds data attributes to the UI components to support these tests. It also refines the model picker's behavior to prevent the main popover from closing when interacting with nested menus. A review comment suggests moving the isPickerContentTarget helper function outside the component to avoid unnecessary re-creations and improve reusability.

[github-actions]

Perf delta summary

Comparator: pass

Profile / Scenario	interaction median	interaction worst	long task max	tbt	frame gap p95	frame gap max	jank count	cls	status
default / homepage-cold	32 -> 24 (-8)	64 -> 72 (+8)	55 -> 54 (-1)	5 -> 4 (-1)	33.3 -> 16.8 (-16.5)	133.4 -> 133.4 (0)	2 -> 2 (0)	0 -> 0 (0)	pass
default / long-session-input-lag	48 -> 40 (-8)	64 -> 48 (-16)	0 -> 0 (0)	0 -> 0 (0)	16.8 -> 16.8 (0)	16.8 -> 16.8 (0)	0 -> 0 (0)	0 -> 0 (0)	pass
default / session-streaming-long	40 -> 40 (0)	48 -> 48 (0)	0 -> 0 (0)	0 -> 0 (0)	16.8 -> 16.7 (-0.1)	16.8 -> 16.8 (0)	0 -> 0 (0)	0 -> 0 (0)	pass
default / tool-call-expand	16 -> 16 (0)	24 -> 16 (-8)	0 -> 0 (0)	0 -> 0 (0)	16.7 -> 16.7 (0)	16.7 -> 16.7 (0)	0 -> 0 (0)	0 -> 0 (0)	pass
default / tool-default-open-heavy-bash	24 -> 24 (0)	24 -> 24 (0)	51 -> 50 (-1)	1 -> 0 (-1)	33.4 -> 33.3 (-0.1)	83.3 -> 83.3 (0)	2 -> 2 (0)	0 -> 0 (0)	pass
default / terminal-side-panel-open	40 -> 40 (0)	40 -> 48 (+8)	0 -> 0 (0)	0 -> 0 (0)	16.8 -> 16.8 (0)	16.8 -> 16.8 (0)	0 -> 0 (0)	0 -> 0 (0)	pass
default / session-scroll-reading	16 -> 16 (0)	16 -> 16 (0)	0 -> 0 (0)	0 -> 0 (0)	16.7 -> 16.7 (0)	16.7 -> 16.7 (0)	0 -> 0 (0)	0.505 -> 0.505 (0)	warn: cls