Full-screen theme picker with 11 theme previews matching iOS
ThemeSelectionView. Live preview on tap. Old dialog deleted and
call-sites migrated to the new route.
Tests use the state-logic fallback pattern (plain kotlin.test rather
than runComposeUiTest) because Compose UI testing in commonTest for
this KMP project is flaky — the existing ThemeManager uses mutableStateOf
plus platform-backed ThemeStorage, which doesn't play well with the
recomposer on iosSimulatorArm64. The behavior under test is identical:
helpers in ThemeSelectionScreenState drive the same code paths the
composable invokes.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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