Fix main screen layout syntax error

[Dev97633]

Motivation

• Restore correct Kotlin structure in MainActivity.kt to fix a compile-time syntax error originating from misaligned AnimatedContent/AlertDialog blocks.
• Ensure the confirmation dialog for disable/enable/uninstall actions is rendered in the correct scope so UI branching behaves deterministically.

Description

• Reorganized the AnimatedContent when (screen) branches to close the composable block properly and reindent the apps, details, and about cases.
• Moved and reformatted the confirmAction?.let { ... AlertDialog(...) } block so the dialog is declared outside of the AnimatedContent rendering closure.
• Preserved existing action handling logic for disable, enable, and uninstall, while fixing brace/indentation issues that caused the syntax error.
• Only app/src/main/kotlin/com/dev/debloater/MainActivity.kt was modified.

Testing

• No automated tests were run after the change.
• The change was made to address a Kotlin syntax error that prevented compilation; please run ./gradlew assembleDebug or ./gradlew build to validate compilation in CI or locally.

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Codex Task