feat: optional wake lock

[KermanX]

resolve #1552.

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[antfu]

Awesome idea!

[antfu]

I think we could have it enabled by default (when the app is on the front). With a client button and context menu to toggle it. And the frontmatter option can disable this feature completely.

In client, the state can be Keep awake when slides in front Always keep awake Do not keep awake

[KermanX]

I think we could have it enabled by default (when the app is on the front). With a client button and context menu to toggle it. And the frontmatter option can disable this feature completely.

In client, the state can be Keep awake when slides in front Always keep awake Do not keep awake

Added this option to the settings popover:

If the tab is not on the front, the wake lock will become effectless automatically by the browser.