xdeck 3.0 (new cask)

[morishin]

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After making any changes to a cask, existing or new, verify:

• The submission is for a stable version or documented exception.
• brew audit --cask --online xdeck is error-free.
• brew style --fix xdeck reports no offenses.

Additionally, if adding a new cask:

• Named the cask according to the token reference.
• Checked the cask was not already refused (add your cask's name to the end of the search field).
• brew audit --cask --new xdeck worked successfully.
• HOMEBREW_NO_INSTALL_FROM_API=1 brew install --cask xdeck worked successfully.
• brew uninstall --cask xdeck worked successfully.

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• AI was used to generate or assist with generating this PR. Claude Code was used to generate the cask formula and run the audit/style checks. The install and uninstall were verified on the author's machine.

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[bevanjkay]

Please try to add a zap stanza. The linked documentation provides some recommended methods to create it.

[bevanjkay]

The livecheck stanza is likely unnecessary, as the upstream repository does not seem to utilise GitHub pre-releases or have tags without releases. The default livecheck should suffice.

Suggested change

	livecheck do
	url :url
	strategy :github_latest
	end

[morishin]

@bevanjkay Thanks for the review! I've removed the unnecessary livecheck stanza and added a zap stanza.