Prevent multiple file pickers when loading logs (fixes #2363)

[Bennethxyz]

This PR prevents multiple file picker dialogs from opening when holding Ctrl+Meta+L on the pre-match screen.

• Introduces a throttled wrapper around the existing log file loader using underscore's throttle (same pattern used for saving logs in utility/gamelog.ts).
• Keeps behavior identical otherwise; only one dialog can be triggered per second.
• Adds minor safety checks for empty selection and types.

Tested locally by holding the hotkey; only a single chooser appears.

Fixes #2363.

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[Bennethxyz]

Also addresses #2174 by flashing the cancel icon on unusable/used active ability clicks.

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Project	Deployment	Preview	Updated (UTC)
ancientbeast	Ready	Preview	Nov 4, 2025 4:58am

[DreadKnight]

@Bennethxyz As I was saying in the other PR for this, can't currently reproduce the issue myself; will try different browsers and operating systems pretty soon. I like that you took a different approach altogether though.

Also addresses #2174 by flashing the cancel icon on unusable/used active ability clicks.

Regarding this one, wish it was a different PR altogether to keep things nicer.
I've tested it and works fine overall, but found an issue:
no cancel icon is displayed when clicking the passive ability after you materialize and unit with Dark Priest.