feat: Add One Dark Inspire theme

[svenit]

Adds One Dark Inspire - a refined take on One Dark with deeper backgrounds, brighter accents, and stronger contrast. Comments stay muted and italic, strings stay green.

[cla-bot]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: VyLe.
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[cla-bot]

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[svenit]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!