Test build: Steam launch options + None (system) display scaling

[Leb-Sun]

Test build only, not for merge. Opened to run PR CI for a Standard APK.

Branch = steam-launch-options (ddd0dfa) + one commit:

Add None (system) scale option. WinNative presents the X screen at its own size (the smallest view-shaped buffer that holds it 1:1, via SurfaceHolder.setFixedSize) and lets the display, or a system upscaler, do the scaling instead of stretching it to the full panel itself.

• In-game drawer: Effects → Scale → None (system); per-game settings: General → Scale (under Screen size). Same stored value (screenEffectsSettings.scaleFilter = 4).
• Touch is unaffected: input maps from the view size, not the buffer.
• Stands aside while the game is on an external display (that controller owns the surface size).
• One new string, added to every locale.