feat(keyboard): add Apple Standard Keyboard visualizer style

[esphynox]

Summary

• Add a new m0116 keyboard visualizer style rendered after the Apple Standard Keyboard, including a dedicated keycap renderer and appearance definitions.
• Introduce style-specific presentation policies so the new style can customize legends, arrow glyphs, wrapped labels, and special-key treatment without hard-coding those rules into shared item factories.
• Restrict the Apple Standard Keyboard style to the white theme and sanitize persisted keyboard theme settings when switching styles.
• Clarify the user-facing style names in Settings and widen the style picker so the longer names fit cleanly.
• Reorganize keyboard appearance code by splitting style-specific appearance definitions and theme tokens into dedicated files.

Tests

• tuist generate
• xcodebuild test -project Keyty.xcodeproj -scheme Keyty -destination 'platform=macOS'
• Other: N/A

Run project commands from Apps/Keyty.

UI Changes

Documentation

• Updated relevant docs
• No docs needed

Release Notes

Added an Apple Standard Keyboard visualizer style with style-specific legends and white-theme enforcement, and renamed the existing Apple style to Apple Magic Keyboard.