feat: confirm recordings without a microphone

[richiemcilroy]

Summary

• add an enabled-by-default General Settings preference requiring confirmation before recording without an available selected microphone
• show an anchored picker warning and a native confirmation for direct Studio/Instant shortcuts
• preserve existing behavior for screenshots, automation/deep links, valid microphones, and users who disable the preference

Validation

• pnpm exec biome check on the five touched TypeScript files
• desktop TypeScript type check
• 12 focused Vitest tests
• cargo fmt --all -- --check
• cargo check -p cap-desktop
• 3 focused hotkey unit tests
• isolated diff integrity checks

Runtime UI smoke testing was not performed because the shared desktop runtime was owned by another active session.

Greptile Summary

Adds an enabled-by-default recording safety preference for missing microphones.

• Adds persisted settings and shared decision logic for microphone confirmation.
• Shows a picker warning before Studio or Instant recording without an available selected microphone.
• Adds native confirmation for direct recording hotkeys while preserving active-recording and screenshot behavior.
• Adds focused TypeScript and Rust tests for the new decision logic.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
apps/desktop/src-tauri/src/hotkeys.rs	Adds microphone availability checks and native confirmation before direct Studio or Instant hotkey starts.
apps/desktop/src/routes/(window-chrome)/settings/general.tsx	Adds the persisted General Settings toggle and optimistic update rollback.
apps/desktop/src/routes/target-select-overlay.tsx	Adds the anchored no-microphone warning and explicitly displays “Preparing...” while required queries initially load.
apps/desktop/src/store.ts	Defines the defaulted persisted recording-start safety store and query integration.
apps/desktop/src/utils/general-settings.ts	Defines the safety preference shape, defaults, and recording-mode confirmation predicate.
apps/desktop/src/utils/general-settings.test.ts	Covers enabled, disabled, microphone-available, and screenshot decision cases.

_{Reviews (2): Last reviewed commit: "fix: show recording start loading state" | Re-trigger Greptile}

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[richiemcilroy]

hey @greptileai, please re-review the PR

[tembo]

Minor edge case: if the user toggles this quickly, multiple recordingStartSafetyStore.set(...) calls can overlap and resolve out-of-order (older write finishing last), leaving the persisted value different from the last toggle. Might be worth serializing writes (promise chain) or disabling the toggle while a save is in-flight so the last intent wins deterministically.

[tembo]

The msg.includes(...) checks here are a bit brittle (string-matching on error text). If the backend can return a structured error code, it’d be more resilient to key off that; otherwise, consider centralizing these substrings as constants so the UI + backend stay in sync.

[tembo]

Minor robustness: if the dialog callback never fires (plugin failure, window closes, etc), this await will hang the hotkey task. Consider adding a timeout and treating it as cancel.

Suggested change

	receiver.await.unwrap_or(false)
	tokio::time::timeout(std::time::Duration::from_secs(60), receiver)
	.await
	.ok()
	.and_then(Result::ok)
	.unwrap_or(false)