Issue for this PR

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Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adds a built-in cinder-jade TUI theme with warm dark surfaces, jade primary accents, and orange highlights.

To make the theme behave consistently without local config overrides, the built-in build, plan, general, and explore agents now resolve to theme color tokens. That keeps the default agent styling theme-driven for stock users while leaving the existing opencode theme unchanged.

How did you verify your code works?

• Parsed the new theme JSON.
• Ran npx tsc --noEmit --pretty false --project packages/opencode/tsconfig.json.
• Opened the TUI locally and checked the home screen, commands dialog, and session view with cinder-jade enabled.

Screenshots / recordings

• Home screen with cinder-jade enabled.

• Commands dialog with the theme active.

• Session view after a ping! prompt.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR