Add SwipeSensitivity property to SfTabView (Android)

[Transis-Felipe]

Closes #393

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Summary

Adds a new SwipeSensitivity bindable property to SfTabView that lets developers control
how far the user must swipe horizontally before a tab switch is triggered on Android.

The old behaviour (hard-coded threshold of 5 × display density) is preserved as the default
value, so this is a non-breaking change.

---

Problem

The _swipeThreshold in SfHorizontalContent.Android.cs was computed from a hard-coded
multiplier of 5:

double _swipeThreshold => 5 * _density;

This made the control noticeably more sensitive than the native MAUI TabbedPage, causing
users to accidentally switch tabs while scrolling vertically through list content hosted
inside a tab.

---

Solution

1. SfTabView.SwipeSensitivity.cs (new partial class file)

A new BindableProperty is added as a partial class of SfTabView:

public static readonly BindableProperty SwipeSensitivityProperty =
    BindableProperty.Create(
        nameof(SwipeSensitivity),
        typeof(double),
        typeof(SfTabView),
        defaultValue: 5.0,             // backward-compatible default
        validateValue: (_, v) => (double)v > 0);

public double SwipeSensitivity
{
    get => (double)GetValue(SwipeSensitivityProperty);
    set => SetValue(SwipeSensitivityProperty, value);
}

An internal const double DefaultSwipeSensitivity = 5.0 is also exposed so the Android
file can reference it without hard-coding the number again.

2. SfHorizontalContent.Android.cs (modified)

The hard-coded multiplier is replaced with a read of the new property:

// Before
double _swipeThreshold => 5 * _density;

// After
double _swipeThreshold =>
    (_tabView?.SwipeSensitivity ?? SfTabView.DefaultSwipeSensitivity) * _density;

---

Public API Change

Member	Kind	Default
SfTabView.SwipeSensitivityProperty	static readonly BindableProperty	—
SfTabView.SwipeSensitivity	double (read/write)	5.0

XAML usage

<!-- Reduce sensitivity: user must swipe ≥15 dp before tab switches -->
<toolkit:SfTabView SwipeSensitivity="15">
    <toolkit:SfTabItem Header="Consulta">
        <views:ConsultaCliente />
    </toolkit:SfTabItem>
    <toolkit:SfTabItem Header="Histórico">
        <views:HistoricoCliente />
    </toolkit:SfTabItem>
</toolkit:SfTabView>

C# usage

var tabView = new SfTabView
{
    SwipeSensitivity = 15   // much less likely to trigger accidentally
};

---

Behaviour by value

SwipeSensitivity	Pixel threshold (mdpi=1×)	Effect
2	2 px	Very sensitive – short swipes switch tabs
5 (default)	5 px	Original behaviour – no change for existing apps
15	15 px	Recommended when tabs host vertically scrollable lists
20	20 px	Near-native MAUI TabbedPage feel

---

Platforms affected

Only Android (SfHorizontalContent.Android.cs). The property is defined on the
cross-platform SfTabView class so it is bindable from XAML/C# on all platforms, but
swipe interception on iOS/Windows/macOS is handled by the platform's native gesture
recognisers and is not affected.

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Checklist

• No breaking change (default value preserves existing behaviour)
• BindableProperty validates that the value is positive
• XML doc comments on the new property and constant
• Consistent naming with existing Enable* / numeric properties in the control
• DefaultSwipeSensitivity constant used in both files to avoid magic numbers

[Transis-Felipe]

@PaulAndersonS Can you review ?

[Copilot]

Pull request overview

This PR introduces a new SwipeSensitivity bindable property on SfTabView to make Android tab-swipe triggering less/more sensitive by configuring the swipe distance threshold (defaulting to the previous hard-coded behavior).

Changes:

• Added SfTabView.SwipeSensitivity / SwipeSensitivityProperty with a default of 5.0 (backward compatible) and a new internal DefaultSwipeSensitivity constant.
• Updated Android SfHorizontalContent swipe threshold computation to use SfTabView.SwipeSensitivity (falling back to the default constant).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
maui/src/TabView/Control/SfTabView.cs	Adds the new public bindable property and default constant.
maui/src/TabView/Control/HorizontalContent/SfHorizontalContent.Android.cs	Replaces the hard-coded swipe threshold with the configurable property-based calculation.

[PaulAndersonS]

Need to update the PR based on the code