Add dark theme script for oz.warp.dev

[zachlloyd]

Adds a dark theme customization script for oz.warp.dev.

What this does

Injects a <style> element that overrides the default light-mode colors on the Oz dashboard with a dark color scheme. The script is:

• Site-scoped – matches only https://oz.warp.dev/*
• Idempotent – guards against duplicate injection via a stable element ID
• Non-destructive – only appends a stylesheet; does not modify existing DOM nodes

Files

• scripts/oz-warp-dev-dark-theme/script.user.js – the dark theme user script
• scripts/oz-warp-dev-dark-theme/manifest.json – script manifest for extension import

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This PR was generated with Oz.