fix(audio-only-mode): handle AbortError on no-refresh video switch; add auto-enable on blur

[Copilot]

Two issues in the audio-only-mode component:

1. With autoEnable on, switching videos without a page refresh caused an AbortError ("The fetching process for the media resource was aborted by the user agent at the user's request") from video.play(), silently failing the audio-mode switch.
2. No mechanism existed to automatically enter audio mode when the user leaves the tab.

Changes

Fix: AbortError on no-refresh navigation

• videoChange callback now waits 800 ms before calling switchToAudioMode(), letting the Bilibili player finish re-initialising the <video> element before we overwrite its src.
• video.play() rejection handler now distinguishes AbortError from real errors — treats it as non-fatal (warns to console, returns cleanly) rather than surfacing an error toast. The next videoChange will retry.

Feature: auto-enable after 30 s of page blur

• New option autoEnableOnBlur (default false, display name 失去焦点后自动启用) in index.ts.
• Uses document.visibilitychange: starts a 30 s timer on hide, cancels on show. Calls switchToAudioMode() if still hidden and not already in audio mode.
• Listener is registered idempotently (remove-then-add) and torn down in beforeDestroy.

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[Copilot]

Pull request overview

This PR improves the audio-only-mode video component by making auto-enable more reliable across no-refresh video navigations and by adding an optional “auto-enable on tab blur” behavior.

Changes:

• Add new autoEnableOnBlur option (default false) to enable audio mode after the page has been hidden for 30s.
• Delay auto-enable on videoChange to reduce video.play() abort failures on no-refresh navigation.
• Treat AbortError from video.play() as non-fatal and avoid showing an error toast for it.

Reviewed changes

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

File	Description
registry/lib/components/video/audio-only-mode/index.ts	Adds autoEnableOnBlur option metadata.
registry/lib/components/video/audio-only-mode/AudioOnlyMode.vue	Adds blur/visibility timer logic; delays auto-enable on videoChange; handles AbortError from play().

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