Fix home screen not scrollable on small devices and landscape mode

[Copilot]

Home screen content gets cut off on small devices and landscape orientation because the layout lacks scroll support.

Changes

• Added verticalScroll(rememberScrollState()) to the main Column in MainLandingScreen
• Replaced wrapContentSize(Alignment.Center) with horizontalAlignment parameter and top spacer for scroll-compatible centering
• Removed redundant .align(Alignment.CenterHorizontally) from child elements

Column(
    modifier = Modifier
        .fillMaxSize()
        .padding(innerPadding)
        .verticalScroll(rememberScrollState()),
    horizontalAlignment = Alignment.CenterHorizontally,
) {
    Spacer(modifier = Modifier.height(32.dp))
    // content...
}

Follows the same scroll pattern used in AppAdditionalConfigs.kt.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Home screen is not scrollable</issue_title>
<issue_description>Home screen is not scrollable on small device making some contents cut off, specially on landscape mode. Fix it.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Home screen is not scrollable #199

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