feat: modernize FetchingMailSettings

[shamim-emon]

• Fixes Modernize Fetching Mail Settings Using Jetpack Compose #11040

This PR migrates the Fetching Mail Settings screen (including the Advanced version) from the old XML to Jetpack Compose. It is part of the ongoing Thunderbird for Android UI modernization effort and fully replaces the legacy UI while preserving all existing functionality.

What changed

• Added a new reusable Compose component ActionText (with preview) and integrated it into SettingItem

• Added necessary string resources and FetchingMailSettingsId

• Updated Gradle dependencies, navigation (AccountSettingsRoute, FeatureLauncherTarget), and legacy AccountSettingsFragment

• Introduced the full Compose architecture:

• FetchingMailSettingsContract

• FetchingMailSettingsBuilder

• UpdateFetchingMailSettings UseCase + implementation

• FetchingMailSettingsViewModel

• FetchingMailSettingsContent / FetchingMailSettingsScreen

• AdvancedFetchingMailSettingsContent / AdvancedFetchingMailSettingsScreen

• Follows the established MVI (Model-View-Intent) architecture with Unidirectional Data Flow (UDF) using the Contract pattern already adopted across the app

• Added unit tests for the builder, ViewModel, and UseCase

[github-actions]

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

[wmontwe]

I noticed that selecting "all messages" for "Local folder size" crashes with:

FATAL EXCEPTION: main
Process: net.thunderbird.android.debug, PID: 28075
java.lang.NumberFormatException: For input string: "all"
	at java.lang.Integer.parseInt(Integer.java:781)
	at java.lang.Integer.parseInt(Integer.java:897)
	at net.thunderbird.feature.account.settings.impl.ui.fetchingMail.FetchingMailSettingsViewModel$event$1.invokeSuspend(FetchingMailSettingsViewModel.kt:82)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
	at kotlinx.coroutines.internal.DispatchedContinuationKt.resumeCancellableWith(DispatchedContinuation.kt:375)
	at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:26)
	at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:358)
	at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:134)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Builders.common.kt:53)
	at kotlinx.coroutines.BuildersKt.launch(Unknown Source:1)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch$default(Builders.common.kt:44)
	at kotlinx.coroutines.BuildersKt.launch$default(Unknown Source:1)
	at net.thunderbird.feature.account.settings.impl.ui.fetchingMail.FetchingMailSettingsViewModel.event(FetchingMailSettingsViewModel.kt:77)
	at net.thunderbird.feature.account.settings.impl.ui.fetchingMail.FetchingMailSettingsViewModel.event(FetchingMailSettingsViewModel.kt:25)
	at net.thunderbird.feature.account.settings.impl.ui.fetchingMail.FetchingMailSettingsScreenKt$FetchingMailSettingsScreen$$inlined$observe$1.invoke(UnidirectionalViewModel.kt:91)
	at net.thunderbird.feature.account.settings.impl.ui.fetchingMail.FetchingMailSettingsScreenKt$FetchingMailSettingsScreen$$inlined$observe$1.invoke(UnidirectionalViewModel.kt:91)
	at net.thunderbird.feature.account.settings.impl.ui.fetchingMail.FetchingMailSettingsScreenKt.FetchingMailSettingsScreen$lambda$2$0(FetchingMailSettingsScreen.kt:62)
	at net.thunderbird.feature.account.settings.impl.ui.fetchingMail.FetchingMailSettingsScreenKt.$r8$lambda$pw_EuYy65ZLZRboTGXTpMlP1X1w(Unknown Source:0)
	at net.thunderbird.feature.account.settings.impl.ui.fetchingMail.FetchingMailSettingsScreenKt$$ExternalSyntheticLambda1.invoke(D8$$SyntheticClass:0)
	at net.thunderbird.feature.account.settings.impl.ui.fetchingMail.FetchingMailSettingsContentKt.handleSettingChange(FetchingMailSettingsContent.kt:114)
	at net.thunderbird.feature.account.settings.impl.ui.fetchingMail.FetchingMailSettingsContentKt.FetchingMailSettingsContent$lambda$4$0(FetchingMailSettingsContent.kt:46)
	at net.thunderbird.feature.account.settings.impl.ui.fetchingMail.FetchingMailSettingsContentKt.$r8$lambda$HfQQi4skxu_JhLB-bQs0nx0cLqA(Unknown Source:0)
	at net.thunderbird.feature.account.settings.impl.ui.fetchingMail.FetchingMailSettingsContentKt$$ExternalSyntheticLambda5.invoke(D8$$SyntheticClass:0)
	at net.thunderbird.core.ui.setting.dialog.ui.DialogSettingViewKt.DialogSettingView$lambda$8$0(DialogSettingView.kt:65)
	at net.thunderbird.core.ui.setting.dialog.ui.DialogSettingViewKt.$r8$lambda$7htRzfBqr7chm_wiE21baDwxgpg(Unknown Source:0)
	at net.thunderbird.core.ui.setting.dialog.ui.DialogSettingViewKt$$ExternalSyntheticLambda4.invoke(D8$$SyntheticClass:0)
	at net.thunderbird.core.ui.setting.dialog.ui.components.dialog.value.SelectDialogViewKt.SelectDialogView$lambda$5$0(SelectDialogView.kt:32)
	at net.thunderbird.core.ui.setting.dialog.ui.components.dialog.value.SelectDialogViewKt.$r8$lambda$RZTkFonzeZ3waNIsR5a1CfCYHDQ(Unknown Source:0)
	at net.thunderbird.core.ui.setting.dialog.ui.components.dialog.value.SelectDialogViewKt$$ExternalSyntheticLambda2.invoke(D8$$SyntheticClass:0)
	at androidx.compose.foundation.ClickableNode.onPointerEvent-H0pRuoY(Clickable.kt:935)
	at androidx.compose.ui.input.pointer.Node.dispatchMainEventPass(HitPathTracker.kt:446)
	at androidx.compose.ui.input.pointer.Node.dispatchMainEventPass(HitPathTracker.kt:432)
	at androidx.compose.ui.input.pointer.NodeParent.dispatchMainEventPass(HitPathTracker.kt:285)

[wmontwe]

When I change "Fetch messages up to" the shown dialog cuts of the "any size (no limit)" selection at the bottom:

[wmontwe]

Thank you for your great work!

I think some of the mappings could be simplyfied and there are bugs with the setting option I commented earlier on.

[wmontwe]

LGTM