- Add OpenChamber brand theme (dark+light): Vitesse syntax over OpenCode-deep neutrals with Flexoki accents, harmonized in OKLCH
- Add scripts/harmonize-theme.mjs: align accent saturation/lightness and boost syntax chroma via OKLCH
- Set default theme to OpenChamber (was Flexoki)
- Rename fields-of-the-shire off the openchamber-* id; keep it as a normal preset
- Remove OpenCode and OC-2 ports and all disabled theme JSON definitions
- Make panel/header/sidebar borders opaque and theme-driven; global default border now uses --border instead of hardcoded rgba
