Add floating text input window for native keyboard features

[andrewleech]

Summary

This PR adds a floating text input window that allows users to access native Android keyboard features like swipe typing and voice dictation, which are not available with ConnectBot's custom keyboard.

Features

• Floating Dialog Window: A draggable dialog that can be positioned anywhere on screen
• Native Keyboard Support: Full Android EditText enables swipe typing, voice input, and text prediction
• Multiple Access Methods:
  • New button in toolbar (next to paste button)
  • Camera button option in settings
• Persistent Positioning: Window position is saved between sessions
• Dark Theme: Matches ConnectBot's design with blue accent colors
• Text Selection: Full support for copy/paste operations

Screenshots

Technical Details

The floating window provides a native text input experience:

• Compact title bar (36dp) for dragging

• White text on dark background

• Blue submit button matching app theme

• 90% screen width for comfortable typing

• Implemented using Dialog instead of PopupWindow to ensure proper text selection support

• Position persistence via SharedPreferences

• Integrated with existing camera button preferences

• Added new menu item with custom icon

Testing

• [x] Window can be opened via menu button
• [ ] Window can be opened via camera button (when configured) - Not tested, no camera button on test device
• [x] Text can be entered and submitted to terminal
• [x] Window can be dragged to any position
• [x] Position persists across app restarts
• [x] Text selection and copy/paste work correctly
• [x] Submit button clears text field after sending
• [x] Close button dismisses the window

Future Enhancements

• Keyboard shortcuts for quick access
• Configurable window size options
• History of recently entered text

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