feat: add Home Feed with pull-to-refresh and gobackend.getLocalTime() API

- Add Home Feed/Explore feature with extension capabilities system
- Add pull-to-refresh on home feed (replaces refresh button)
- Add gobackend.getLocalTime() API for accurate device timezone detection
- Add YT Music Quick Picks UI with swipeable vertical format
- Fix greeting time showing wrong time due to Goja getTimezoneOffset() returning 0
- Update spotify-web and ytmusic extensions to use getLocalTime()
- Add Turkish language support
- Update CHANGELOG for v3.2.0

lib/screens/settings/appearance_settings_page.dart

@@ -709,6 +709,7 @@ static const _allLanguages = [
     ('pt', 'Português', Icons.language),
     ('pt_PT', 'Português (Brasil)', Icons.language),
     ('ru', 'Русский', Icons.language),
+    ('tr', 'Türkçe', Icons.language),
     ('zh', '简体中文', Icons.language),
     ('zh_CN', '简体中文 (中国)', Icons.language),
     ('zh_TW', '繁體中文', Icons.language),