Release v1.3.4: theme, UI, version, metadata

Bump app to v1.3.4 (versionCode=5) and change applicationId to com.saad2134.dosezy. Add runtime POST_NOTIFICATIONS permission request on Android Tiramisu. Improve theming and accessibility: many UI components now use MaterialTheme colorScheme, dark/light-aware colors, updated borders/backgrounds, dropdown/menu backgrounds, and button color refinements. Fix onboarding back-navigation behaviour and dialog styling (delete profile). Remove firebase-annotations from libs.versions and deps. Add Play Store fastlane metadata (changelog, descriptions, title, screenshots, icon). Update README badge to v1.3.4.

Full Changelog: v1.3.2...v1.3.4