Fix ScrollView showing unnecessary scrollbars when margins are applied on Android

[Copilot]

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Description

Fixed an issue where ScrollView on Android devices would incorrectly display scrollbars and enable scrolling behavior when margins were applied to a control containing the ScrollView, even when the content fit within the available space.

Root Cause

The issue occurred because the Android ScrollView was being measured with the original constraints (before accounting for padding/margins), causing it to think it had more space than actually available. When an inset panel is present to handle margins and padding, the ScrollView's measurement logic didn't account for the space that would be consumed by the inset panel.

Solution

Modified the GetDesiredSize() method in ScrollViewHandler.Android.cs to:

1. Detect inset panel presence: Check if an inset panel is present (indicating margins/padding need special handling)
2. Calculate space consumption: Calculate the total space consumed by both padding and margins
3. Adjust effective constraints: Pass corrected constraints to the ScrollView measurement that account for the space the inset panel will consume
4. Preserve edge cases: Handle infinity constraints and prevent negative values
5. Minimal impact: Only apply adjustments when inset panel is present and space consumption is positive

Before/After Behavior

Before: ScrollView with margin would show scrollbars and allow scrolling even when content fits within available space

After: ScrollView with margin only shows scrollbars when content actually exceeds the available space after accounting for margins

Testing

• Added test case ScrollViewMarginIssue.xaml to reproduce the issue
• Added corresponding UI test ScrollViewMarginIssue.cs for validation
• Verified fix doesn't impact existing ScrollView functionality
• Code formatted according to project guidelines

This change restores the correct behavior that was present in Xamarin.Forms and ensures ScrollViews behave predictably when margins are applied.

Fixes #11.

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