Catthode for Zed v0.1.1

Updates the pre-publication extension ID to catthode-theme to comply with Zed’s theme-extension naming prerequisite. Theme JSON passes Zed’s live v0.2.0 schema. Marketplace submission remains intentionally gated on Zed’s required manual in-app test.

Catthode for Zed v0.1.0

Initial Zed UI, syntax, terminal, diagnostics, and collaboration theme.