Fix/android 15 keyboard overlap

[ish1416]

Description

Fixes keyboard overlap issue on Android 15+ devices where input fields at the bottom of the screen are completely covered by the keyboard when focused, even with edge-to-edge configuration enabled.

Closes #8166

Problem

On Android 15+ devices (API 34+), the keyboard overlaps bottom input fields when:

• adjustMarginsForEdgeToEdge: 'force' is set
• captureInput: true is configured
• Keyboard.resizeOnFullScreen: false is used
• Edge-to-edge enforcement is active

This occurs because Android 15's edge-to-edge changes how IME insets are handled, causing the WebView to not properly adjust for keyboard visibility.

Solution

Enhanced CapacitorWebView.edgeToEdgeHandler() with:

1. Android 15+ detection (API 34+) for specialized keyboard handling
2. Smart IME inset management - uses padding instead of margins for keyboard space
3. Auto-scroll to focused inputs - JavaScript-based detection and scrolling when keyboard appears
4. Proper inset return values - lets system handle IME insets on Android 15+
5. Backward compatibility - maintains existing behavior for older Android versions

Testing

• ✅ Tested on Samsung Galaxy S24 Ultra (Android 15, One UI)
• ✅ Bottom input fields remain visible when keyboard opens
• ✅ Auto-scroll works for inputs covered by keyboard
• ✅ Compatible with existing keyboard configurations
• ✅ No regression on older Android versions

Configuration

Works with standard Capacitor keyboard configuration:

android: {
  captureInput: true,
  adjustMarginsForEdgeToEdge: 'force'
},
plugins: {
  Keyboard: {
    resizeOnFullScreen: false
  }
}