feat: workflow worker thread + paste unit tests

[summeroff]

Summary

The larger leftover from the v1.0.5 review:

1. Workflow off the UI thread

   • Hotkey still arms/fires on the message window.
   • Send-to-AI / insert-only run on a worker; tray stays responsive during 10s page-ready + clipboard hold.
   • Done is posted as WM_QP_WORK_DONE (WM_APP+2, not the tray message).
   • EnsureComInitialized is thread_local so UIA fallback works on the worker.
   • Exit / takeover WM_CLOSE joins the worker (up to 20s) before destroy.

2. JS unit tests around paste

   • extension/paste_logic.js shared by content script, background, and Node.
   • node --test tests/paste_logic.test.cjs — duplicate detect, HTML escape, isAlreadyOnApp, HTTPS origin allowlist.
   • CI job Extension unit tests; build now needs: [format, js].

After merge: Reload unpacked companion (paste_logic.js is a new content-script file).

Test plan

• node --test tests/paste_logic.test.cjs — 9 pass
• Debug build + --self-test exit 0
• Manual: fire Ctrl+Alt+J while dragging the tray menu / About — UI should not freeze
• Manual: Reload extension, Meta/Gemini paste still once, cancel-on-focus still works

[Copilot]

Pull request overview

Moves hotkey workflows off the UI thread and adds shared, tested extension paste helpers.

Changes:

• Adds workflow worker lifecycle and per-thread COM initialization.
• Centralizes extension paste and URL logic.
• Adds Node tests and CI coverage.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/app.cpp	Implements worker execution and completion handling.
include/app.hpp	Declares worker state and APIs.
src/page_ready.cpp	Makes COM initialization thread-local.
include/page_ready.hpp	Updates COM initialization documentation.
extension/paste_logic.js	Adds shared paste and URL helpers.
extension/content.js	Uses shared paste helpers.
extension/background.js	Uses shared URL helpers.
extension/manifest.json	Loads the shared content script.
tests/paste_logic.test.cjs	Tests shared helper behavior.
.github/workflows/ci.yml	Runs extension unit tests.
README.md	Documents worker behavior and tests.

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[summeroff]

Fixed in 5c9f63f — --self-test now starts the worker, queues a no-op job, pumps WM_QP_WORK_DONE / busy, then stops idle and mid-job. No clipboard/SendInput in that path.

[summeroff]

Fixed in 5c9f63f — removed TerminateThread. StopWorkThread waits INFINITE for the current job to finish, then the worker sees workStop_ and exits.

[summeroff]

Addressed Copilot in 5c9f63f (2/2):

1. Worker lifecycle is now in --self-test (queue → WM_QP_WORK_DONE → busy clear; stop idle + stop mid-job).
2. No more TerminateThread. Shutdown waits for the worker to finish the current job.

Left open.

[Copilot]

Pull request overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated no new comments.

Suppressed comments (2)

src/app.cpp:1078

• This does not ensure the job is active before shutdown starts. StopWorkThread signals the stop event immediately, and because that event is index 0 in WaitForMultipleObjects, the worker can exit without dequeuing or entering the 200 ms job. Synchronize on a worker-started event/latch before calling StopWorkThread so the active-job shutdown path is actually exercised.

        expect(app.QueueHotkeyWork(job), L"work test queue active");
        app.StopWorkThread();

src/app.cpp:355

• This runs on the window thread (from both WM_TIMER and OnWorkDone), but Ping blocks in ExtBridge::Call for up to 800 ms. If the native host remains connected while the service worker is stalled, the tray/menu will freeze on every two-second retry, up to 30 times, undermining the responsiveness this PR is intended to provide. Perform the version request asynchronously and post its result back to the window thread instead.

    if (!ExtBridge::Instance().Ping(800, &verU))