feat(ui): add Turkish language to settings popup

Added Turkish (Türkçe) to the language selection dropdown in SettingsPopup.svelte.
Turkish translation files already exist in the codebase (lang/tr.json files).

Signed-off-by: Bahadır Atılgan <gokcel.bahadir@gmail.com>
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: 2 people

packages/ui/src/components/internal/SettingsPopup.svelte

@@ -79,7 +79,8 @@
     { id: 'it', label: ui.string.Italian, logo: '🇮🇹' },
     { id: 'cs', label: ui.string.Czech, logo: '🇨🇿' },
     { id: 'de', label: ui.string.German, logo: '🇩🇪' },
-    { id: 'ja', label: ui.string.Japanese, logo: '🇯🇵' }
+    { id: 'ja', label: ui.string.Japanese, logo: '🇯🇵' },
+    { id: 'tr', label: ui.string.Turkish, logo: '🇹🇷' }
   ].filter((lang) => uiLangs.has(lang.id))
 
   if (langs.findIndex((l) => l.id === $currentLanguage) < 0 && langs.length !== 0) {