Dark-mode widget & releases filter

• Widget now shows all labels correctly in dark mode and refreshes in the background
• Home screen reloads automatically right after creating an issue or pull request
• New “Releases” filter chip on the home screen surfaces the latest releases
• Jump straight to a freshly copied or moved issue
• Tighter search filter chips
• Credits section linking to the Gitea and Forgejo projects
• New “More apps for self-hosters” hint on the home screen