docs(changelog): update v3.0.0 theme names

Update theme names in v3.0.0 changelog entry to reflect the rename from
product-specific names (coana, socket-firewall, socket-cli-python) to
creative generic names (sunset, brick, jungle).

Author: jdalton

CHANGELOG.md

@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- Theme system with 5 built-in themes: `socket`, `coana`, `socket-firewall`, `socket-cli-python`, `ultra`
+- Theme system with 5 built-in themes: `socket`, `sunset`, `brick`, `jungle`, `ultra`
 - `setTheme()`, `getTheme()`, `withTheme()`, `withThemeSync()` for theme management
 - `createTheme()`, `extendTheme()`, `resolveColor()` helper functions
 - `onThemeChange()` event listener for theme reactivity