Extract ScannerScreen content into ScannerContent composable and use lifecycle-aware state collection

[MihaiCristianCondrea]

Motivation

• Reduce complexity in ScannerScreen by moving the dashboard/analyze UI rendering into a focused composable to improve readability and maintainability.
• Ensure state collection is lifecycle-aware to match project conventions and avoid collecting flows outside the Activity lifecycle.

Description

• Introduced a private composable ScannerContent(...) that encapsulates the previous inline Column/AnimatedContent logic and BackHandler handling for the analyze/dashboard switch.
• Replaced the inline content block in ScannerScreen with a call to ScannerContent(...) and preserved existing event wiring and navigation callbacks.
• Adjusted the dashboard state type usage to UiStateScreen<DashboardUiState> and removed the direct collectAsState usage in favor of collectAsStateWithLifecycle() for scannerViewModel.uiState.
• Kept dialog rendering routed via ScannerDialogs(...) and left dialog behavior and events unchanged.

Testing

• Ran ./gradlew test, which failed due to missing Android SDK configuration (missing ANDROID_HOME or local.properties sdk.dir).

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Codex Task