refactor: core UI common

[wmontwe]

Part of #10392

This pull request refactors and reorganizes the core UI 'common' utilities, moving shared code out of the app.k9mail namespace into the new net.thunderbird.core.ui.common package.

• Consolidate shared UI utilities into core/ui/common: move PreviewDevices* annotations and WindowSizeClass (now backed by a new WindowSizeInfo) into the module, and extend it with a CalculateWindowSizeInfo helper.
• Drop redundant core/ui/compose/common pieces: BaselineModifier, ImageWithBaseline, ImageWithOverlayCoordinate, VisibilityModifiers, IconsWithBaseline, and IconsWithBottomRightOverlay. These switched to plain Icons/vertical alignment.
• Relocate DelayedCircularProgressIndicator and the hide modifier into the onboarding-permissions module and update feature modules to depend on core:ui:common where needed.
• Removed testTagAsResourceId as it's semantic changes are redundant and only need to be applied once on the outmost composable. Use testTag instead.

[github-actions]

✅ Validation Passed: All report and feature-flag labels are correctly set.

[rafaeltonholo]

There is a crash happening now because of the changes in the CalculateWindowSizeInfo.kt. Everything else is good.

[rafaeltonholo]

This is causing the app to crash due to an IllegalArgumentException. The previous version used configuration.screenWidthDp and configuration.screenHeightDp, but we are now using the pixel values, which is leading to this issue.

Stacktrace:

FATAL EXCEPTION: main
  Process: net.thunderbird.android.debug, PID: 13363
  java.lang.IllegalArgumentException: Padding must be non-negative
  at androidx.compose.foundation.layout.internal.InlineClassHelperKt.throwIllegalArgumentException(InlineClassHelper.kt:34)
  at androidx.compose.foundation.layout.PaddingValuesImpl.<init>(Padding.kt:479)
  at androidx.compose.foundation.layout.PaddingValuesImpl.<init>(Padding.kt:0)
  at androidx.compose.foundation.layout.PaddingKt.PaddingValues-YgX7TsA(Padding.kt:280)
  at androidx.compose.foundation.layout.PaddingKt.PaddingValues-YgX7TsA$default(Padding.kt:279)
  at net.thunderbird.core.ui.common.padding.CalculateResponsivePaddingKt.calculateResponsiveWidthPadding(CalculateResponsivePadding.kt:19)
  at app.k9mail.core.ui.compose.designsystem.template.ResponsiveContentKt.ExpandedContent$lambda$1$0(ResponsiveContent.kt:107)
  at app.k9mail.core.ui.compose.designsystem.template.ResponsiveContentKt.$r8$lambda$olhqj8zKdH2OFb37DfkmQIzTcjA(ResponsiveContent.kt:0)
  at app.k9mail.core.ui.compose.designsystem.template.ResponsiveContentKt$$ExternalSyntheticLambda4.invoke(D8$$SyntheticClass:0)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:122)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:52)
  at androidx.compose.material3.SurfaceKt$Surface$1.invoke(Surface.kt:130)
  at androidx.compose.material3.SurfaceKt$Surface$1.invoke(Surface.kt:110)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:122)
  at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:52)
  at androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:378)
  at androidx.compose.material3.SurfaceKt.Surface-T9BRK9s(Surface.kt:107)
  at app.k9mail.core.ui.compose.designsystem.atom.SurfaceKt.Surface-_UMDTes(Surface.kt:50)
  at app.k9mail.core.ui.compose.designsystem.template.ResponsiveContentKt.ExpandedContent(ResponsiveContent.kt:102)
  at app.k9mail.core.ui.compose.designsystem.template.ResponsiveContentKt.ResponsiveContent(ResponsiveContent.kt:37)
  at app.k9mail.feature.onboarding.welcome.ui.WelcomeContentKt.WelcomeContent$lambda$0(WelcomeContent.kt:50)

[wmontwe]

This code was sitting on my shelf for a while. I think I'll need pull in changes done at a later time, that will fix this.