Set up Roborazzi for screenshot tests

[Goooler]

https://github.com/takahirom/roborazzi/blob/4be7f304fa23f2f00fad67ab612aec2035ac9db2/README.md

Closes #219.

[Copilot]

Pull request overview

This PR introduces Roborazzi-based Compose screenshot testing across the UI feature modules, wiring up Robolectric test execution, a shared capture helper, and CI verification to prevent screenshot regressions.

Changes:

• Adds a :ui:testkit module with a shared captureRoboImages helper that captures both light/dark variants.
• Adds Robolectric screenshot tests for multiple Compose preview composables across ui/* modules (and loosens preview visibility from private to internal to make them callable from tests).
• Integrates the Roborazzi Gradle plugin + dependencies in the root build, and adds a GitHub Actions job to run verifyRoborazziDebug.

Reviewed changes

Copilot reviewed 45 out of 96 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
ui/testkit/src/main/kotlin/com/github/kr328/clash/ui/RoborazziCompose.kt	Adds shared helper to capture light/dark screenshots with Roborazzi.
ui/testkit/build.gradle.kts	Declares :ui:testkit as an Android library with Roborazzi deps.
ui/settings/src/test/kotlin/com/github/kr328/clash/settings/ui/SettingsScreenTest.kt	Adds screenshot test invoking the Settings preview.
ui/settings/src/test/kotlin/com/github/kr328/clash/settings/ui/OverrideSettingsScreenTest.kt	Adds screenshot test invoking the Override Settings preview.
ui/settings/src/test/kotlin/com/github/kr328/clash/settings/ui/NetworkSettingsScreenTest.kt	Adds screenshot tests for Network Settings previews.
ui/settings/src/test/kotlin/com/github/kr328/clash/settings/ui/MetaFeatureSettingsScreenTest.kt	Adds screenshot test for Meta Feature Settings preview.
ui/settings/src/test/kotlin/com/github/kr328/clash/settings/ui/EditableTextMapScreenTest.kt	Adds screenshot test for EditableTextMap preview.
ui/settings/src/test/kotlin/com/github/kr328/clash/settings/ui/EditableTextListScreenTest.kt	Adds screenshot test for EditableTextList preview.
ui/settings/src/test/kotlin/com/github/kr328/clash/settings/ui/AppSettingsScreenTest.kt	Adds screenshot tests for App Settings previews.
ui/settings/src/test/kotlin/com/github/kr328/clash/settings/ui/AccessControlScreenTest.kt	Adds screenshot tests for Access Control previews/sheets.
ui/settings/src/main/kotlin/com/github/kr328/clash/settings/ui/SettingsScreen.kt	Makes preview composable internal for test access.
ui/settings/src/main/kotlin/com/github/kr328/clash/settings/ui/OverrideSettingsScreen.kt	Makes preview composable internal for test access.
ui/settings/src/main/kotlin/com/github/kr328/clash/settings/ui/NetworkSettingsScreen.kt	Makes preview composables internal for test access.
ui/settings/src/main/kotlin/com/github/kr328/clash/settings/ui/MetaFeatureSettingsScreen.kt	Makes preview composable internal for test access.
ui/settings/src/main/kotlin/com/github/kr328/clash/settings/ui/EditableTextMapScreen.kt	Makes preview composable internal for test access.
ui/settings/src/main/kotlin/com/github/kr328/clash/settings/ui/EditableTextListScreen.kt	Makes preview composable internal for test access.
ui/settings/src/main/kotlin/com/github/kr328/clash/settings/ui/AppSettingsScreen.kt	Makes preview composables internal for test access.
ui/settings/src/main/kotlin/com/github/kr328/clash/settings/ui/AccessControlScreen.kt	Makes preview composables internal for test access.
ui/proxy/src/test/kotlin/com/github/kr328/clash/proxy/ui/ProxyScreenTest.kt	Adds screenshot test invoking the Proxy preview.
ui/proxy/src/main/kotlin/com/github/kr328/clash/proxy/ui/ProxyScreen.kt	Makes preview composable internal for test access.
ui/profile/src/test/kotlin/com/github/kr328/clash/profile/ui/ProvidersScreenTest.kt	Adds screenshot test invoking the Providers preview.
ui/profile/src/test/kotlin/com/github/kr328/clash/profile/ui/PropertiesScreenTest.kt	Adds screenshot test invoking the Properties preview.
ui/profile/src/test/kotlin/com/github/kr328/clash/profile/ui/ProfilesScreenTest.kt	Adds screenshot test invoking the Profiles preview.
ui/profile/src/test/kotlin/com/github/kr328/clash/profile/ui/NewProfileScreenTest.kt	Adds screenshot test invoking the New Profile preview.
ui/profile/src/test/kotlin/com/github/kr328/clash/profile/ui/FilesScreenTest.kt	Adds screenshot test invoking the Files preview.
ui/profile/src/main/kotlin/com/github/kr328/clash/profile/ui/ProvidersScreen.kt	Makes preview composable internal for test access.
ui/profile/src/main/kotlin/com/github/kr328/clash/profile/ui/PropertiesScreen.kt	Makes preview composable internal for test access.
ui/profile/src/main/kotlin/com/github/kr328/clash/profile/ui/ProfilesScreen.kt	Makes preview composable internal and stabilizes preview time data.
ui/profile/src/main/kotlin/com/github/kr328/clash/profile/ui/NewProfileScreen.kt	Makes preview composable internal for test access.
ui/profile/src/main/kotlin/com/github/kr328/clash/profile/ui/FilesScreen.kt	Makes preview composable internal for test access.
ui/log/src/test/kotlin/com/github/kr328/clash/log/ui/LogsScreenTest.kt	Adds screenshot test invoking the Logs preview.
ui/log/src/test/kotlin/com/github/kr328/clash/log/ui/LogcatScreenTest.kt	Adds screenshot test invoking the Logcat preview.
ui/log/src/main/kotlin/com/github/kr328/clash/log/ui/LogsScreen.kt	Makes preview composable internal for test access.
ui/log/src/main/kotlin/com/github/kr328/clash/log/ui/LogcatScreen.kt	Makes preview composable internal for test access.
ui/home/src/test/kotlin/com/github/kr328/clash/home/ui/HomeScreenTest.kt	Adds screenshot tests invoking Home previews.
ui/home/src/test/kotlin/com/github/kr328/clash/home/ui/HelpScreenTest.kt	Adds screenshot test invoking Help preview.
ui/home/src/main/kotlin/com/github/kr328/clash/home/ui/HomeScreen.kt	Makes preview composables internal for test access.
ui/home/src/main/kotlin/com/github/kr328/clash/home/ui/HelpScreen.kt	Makes preview composable internal for test access.
ui/crash/src/test/kotlin/com/github/kr328/clash/crash/ui/AppCrashedScreenTest.kt	Adds screenshot test invoking crash preview.
ui/crash/src/test/kotlin/com/github/kr328/clash/crash/ui/ApkBrokenScreenTest.kt	Adds screenshot test invoking apk-broken preview.
ui/crash/src/main/kotlin/com/github/kr328/clash/crash/ui/AppCrashedScreen.kt	Makes preview composable internal for test access.
ui/crash/src/main/kotlin/com/github/kr328/clash/crash/ui/ApkBrokenScreen.kt	Makes preview composable internal for test access.
settings.gradle.kts	Includes the new :ui:testkit module.
gradle/libs.versions.toml	Adds Roborazzi + test libraries and plugin coordinates.
build.gradle.kts	Enables Robolectric resources, applies/configures Roborazzi, and adds test deps to Compose modules.
.github/workflows/build.yml	Adds CI job running verifyRoborazziDebug and makes it required.

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[Goooler]

Blocker: takahirom/roborazzi#828