chore(deps): update and clean dependencies

[libhide]

Summary

• update Gradle to 9.7.0 and AGP to 9.3.1
• update Kotlin, KSP, Compose, Activity, AndroidX Hilt, Splashscreen, Accompanist, and Spotless
• remove the unused Gradle Enterprise/Develocity plugin and unnecessary repositories
• remove redundant Coil and test BOM declarations
• consolidate Retrofit version management and use implementation-scoped app dependencies
• migrate lifecycle and Hilt Compose imports required by updated AndroidX libraries
• address new Compose lint checks for resource access and modifier construction

Intentionally unchanged

• Retrofit 2.x
• OkHttp 4.x
• Coil 2.x
• ktlint 0.50.x

These have broader major-version or formatting migrations and are better handled separately.

Verification

• ./gradlew spotlessApply clean :app:assembleDebug spotlessCheck :app:lintDebug --warning-mode all
• ./gradlew :app:installDebug spotlessCheck :app:lintDebug
• launched the debug app on the API 36 emulator and checked logcat for startup crashes