Introduces GitHub issue and PR templates, contributing and security documentation. Adds Android 12+ splash screen support, updates theming and status color handling, and improves MaskedEmail card/detail UI with shared transitions and accessibility. Updates dependencies for Compose and Material3, and enhances README with detailed setup and contribution instructions.
Expanded .gitignore to exclude Gradle, Android, and IDE files. Added several .idea configuration files and the gradle-wrapper.jar to support project setup and development environment consistency. Updated app/build.gradle.kts and JmapModels.kt for build and API model changes.
