Migrate to single activity

[anod]

All basic functionality should work

This PR migrates the application from a multi-activity architecture to a single-activity architecture using AndroidX Navigation3 and Material3 Adaptive components. The migration introduces declarative navigation, removes multiple Activity classes, and consolidates UI state management.

Replaces individual Activity classes with composable screens using Navigation3
Updates minimum SDK from 27 to 31 and bumps version to 1.7.0
Modernizes dependency versions including Gradle, AndroidX libraries, and Kotlin

[Copilot]

Pull Request Overview

This PR migrates the application from a multi-activity architecture to a single-activity architecture using AndroidX Navigation3 and Material3 Adaptive components. The migration introduces declarative navigation, removes multiple Activity classes, and consolidates UI state management.

• Replaces individual Activity classes with composable screens using Navigation3
• Updates minimum SDK from 27 to 31 and bumps version to 1.7.0
• Modernizes dependency versions including Gradle, AndroidX libraries, and Kotlin

Reviewed Changes

Copilot reviewed 73 out of 75 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
app/src/main/java/com/anod/appwatcher/AppWatcherActivity.kt	Transforms from simple MainActivity subclass to single-activity host with Navigation3 integration
app/src/main/java/com/anod/appwatcher/wishlist/WishListViewModel.kt	Removes activity-specific actions, adds auth token checking and error handling
app/src/main/java/com/anod/appwatcher/watchlist/WatchListStateViewModel.kt	Refactors navigation actions from activity-based to navigation key-based
app/build.gradle.kts	Updates minSdk to 31, adds serialization and navigation dependencies
settings.gradle.kts	Adds AndroidX snapshot repository for navigation3 dependencies
gradle/libs.versions.toml	Updates library versions including navigation3, compose, and other AndroidX libraries

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