fix(coordinator): add shutdown flag to supervisor + dispatcher loops [中]

[appergb]

User description

Summary

Five hotkey supervisor loops in `coordinator.rs` (dictation / qa / combo / translation / action) and the global-hotkey dispatcher loop in `global_hotkey_runtime.rs` run as `loop { ... sleep N }` with no exit signal.

In production the OS reaps these threads at process exit, so this isn't a user-visible bug today. But:

• Integration tests can't drive Coordinator up/down without leaking threads across test runs.
• Future `RunEvent::Exit` cleanup work has nowhere to plug in.
• A panicked listener thread leaves the supervisor spinning forever with no way to surface the failure.

Change

• `Inner` gains an `AtomicBool shutdown` field. Each supervisor loop reads it at the top of each iteration (before any work / sleep) and `return`s when set.
• `GlobalHotkeyRuntime` gains a parallel `AtomicBool shutdown`; the dispatcher loop checks it before each 250 ms `recv_timeout`.
• Public methods `Coordinator::request_shutdown` and `GlobalHotkeyRuntime::request_shutdown` set the respective flags. `#[allow(dead_code)]` until the `RunEvent::Exit` wiring lands — this PR is infrastructure-only.

Why this is safe

The change is passive: nothing in the production binary sets the flags, so behavior is unchanged. Tests that want bounded teardown can now call `request_shutdown` explicitly. The check is a single `load(SeqCst)` per iteration — overhead is unmeasurable.

Audit linkage

Audit IDs 3.1.2 (loop exit signal, 中) + 3.4.4 (dispatcher loop, 低). Both CONFIRMED. `3.1.3` (JoinHandle storage) is deferred — without a supervisor consumer for `is_finished()` liveness checks, storing the handle is a no-op. See `docs/audit-2026-05-10-validated.md` (local).

Test plan

• `cargo test --lib` — 183/183 pass.
• `cargo check --lib` clean.
• CI build — to be verified.
• Future: wire `Coordinator::request_shutdown` + `GlobalHotkeyRuntime::request_shutdown` from `RunEvent::Exit` in `lib.rs` so app-quit teardown is bounded. Out of scope for this PR.

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PR Type

Enhancement, Tests

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Description

• Add shutdown AtomicBool to Inner struct and supervisor loops

• Add shutdown AtomicBool to GlobalHotkeyRuntime and dispatcher loop

• Expose request_shutdown methods for integration tests and future Exit hook

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Diagram Walkthrough

flowchart LR
A["Coordinator::request_shutdown()"] --> B["Inner::shutdown"]
B --> C["hotkey supervisor loops (dictation, qa, combo, translation, action)"]
D["GlobalHotkeyRuntime::request_shutdown()"] --> E["GlobalHotkeyRuntime::shutdown"]
E --> F["global hotkey dispatcher loop"]

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File Walkthrough

Relevant files

Enhancement

coordinator.rs Add shutdown flag to coordinator's hotkey supervisor loops openless-all/app/src-tauri/src/coordinator.rs Added shutdown: AtomicBool field to Inner struct Initialized shutdown to false in both constructor variants Added public request_shutdown method to set the flag Checked shutdown flag at top of each supervisor loop Marked request_shutdown as #[allow(dead_code)] +31/-0 global_hotkey_runtime.rs Add shutdown flag to global hotkey dispatcher loop openless-all/app/src-tauri/src/global_hotkey_runtime.rs Added shutdown: AtomicBool field to GlobalHotkeyRuntime Imported AtomicBool and Ordering Initialized shutdown to false in shared() constructor Added public request_shutdown method Dispatcher loop checks shutdown before each recv_timeout +17/-0

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