feat: Add floating keyboard functionality to Scribe-Android (#261)

[prince-0408]

Description

This pull request implements and refines the floating keyboard functionality for Scribe-Android. It introduces a movable, resizable, and floating keyboard layout, and resolves various styling issues across both light and dark modes.

Adding this feature solves a major point of confusion during onboarding/development where developers couldn't locate the keyboard in emulators that default to a floating state. It also greatly improves the keyboard experience in full-screen games, split-screen multitasking, and landscape layouts on tablet/phone screens.

Closes #261

Changes Made

• Floating Keyboard Layout & Controls:
  • Integrated floating_drag_bar with visibility state tied to the floating preference.
  • Implemented real-time dragging via a customized floating_drag_handle pill.
  • Added support for scaling/resizing the keyboard dynamically using custom touch listeners on 4 corner handles (resize_handle_top_left/right and resize_handle_bottom_left/right).
• Drag Handle Aesthetics:
  • Resized the bottom drag handle to a thicker (5dp) and wider (64dp canvas) rounded capsule.
  • Set a larger layout height (32dp) to comfortably display the updated handle.
• Corner Resize Handles Visibility:
  • Defined a neutral, high-contrast resource resize_handle_color for both modes (#FF555555 solid medium-dark grey in light mode, and #FFB0B0B0 solid medium-light grey in dark mode).
  • This ensures they are clearly visible over light, dark, and blue backgrounds (such as the tutorial pages).
• Docked Mode Background Leak Fix:
  • Configured keyboard_card to dynamically update its background color based on the current theme (dark_keyboard_bg_color or light_keyboard_bg_color) instead of using a static light grey.
  • This fixes the background color leak gap at the bottom of the docked keyboard.

Screenshots

[github-actions]

Thank you for the pull request! 💙🩵

The Scribe-Android team will do our best to address your contribution as soon as we can. The following are some important points:

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• Also consider attending our bi-weekly Saturday developer syncs!
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[github-actions]

Maintainer Checklist

The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

• Tests for changes have been written and the unit test, linting and formatting workflows within the PR checks do not indicate new errors in the files changed

  • Tests may need to be reran as they're at times not deterministic

• The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)