feat(FN-1213): add 8 new color themes to dashboard

- Add 8 new theme IDs to COLOR_THEMES in core types
- Add CSS blocks with color swatches for all 8 new themes
- Update ThemeSelector to display new theme options
- Register themes in index.html validThemes array
- Add comprehensive tests for new theme support
- Include changeset for @gsxdsm/fusion package

packages/core/src/types.ts

@@ -46,6 +46,14 @@ export const COLOR_THEMES = [
   "parchment",
   "terminal",
   "glass",
+  "horizon",
+  "vitesse",
+  "outrun",
+  "snazzy",
+  "porple",
+  "espresso",
+  "mars",
+  "poimandres",
 ] as const;
 export type ColorTheme = (typeof COLOR_THEMES)[number];