Custom Toggle

[sieunju]

Title: [Feature] CustomSwitchView — Apple-style toggle switch

Labels: enhancement, view

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Summary

Add a CustomSwitchView to the view module that replicates the smooth, minimal toggle switch seen in iOS/macOS — satisfying the library's core concept of zero external dependencies.

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Design Reference

iOS UISwitch behavior:

• Rounded pill-shaped track (thumb + track)
• Thumb slides left ↔ right with spring-like animation
• Track color transitions smoothly (e.g., gray → green)
• Supports tap and drag-to-toggle gestures

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Expected API

<hmju.widget.view.CustomSwitchView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:switchChecked="true"
app:trackColorOn="@color/green"
app:trackColorOff="@color/gray"
app:thumbColor="@color/white"
app:animationDuration="250" />

switchView.setOnCheckedChangeListener { isChecked -> }
switchView.isChecked = true

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Acceptance Criteria

• Thumb slide animation with configurable duration
• Track color transition animation on toggle
• Drag gesture support (partial drag → snap to nearest state)
• isChecked property + setOnCheckedChangeListener
• XML attrs: trackColorOn, trackColorOff, thumbColor, animationDuration
• Example screen added to app module
• No external library dependencies

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