[Feature Request] Support Custom Virtual Button Icons

[cxin0105-boop11]

Feature Request

Add support for custom virtual button icons, allowing users to set their own images for on-screen touch controls / virtual gamepad buttons.

Use Cases

• Handheld users wanting more personalization for touch layouts.
• Different games benefiting from unique button themes (transparent, cartoon, pixel art, game-specific icons, etc.).
• Extending the existing button label styles (Xbox / PlayStation / GameHub) with full icon customization.

Proposed Implementation

1. Add a "Custom Icons" option in the Touch / Controls settings.
2. Allow selecting images from gallery or file picker (PNG / WebP / SVG preferred).
3. Save icons per shortcut (different games can have different icons).
4. Include a "Reset to Default" button.
5. Automatically resize + cache icons for performance.
6. Optional: Long-press on a button to quickly replace its icon.

References

• Current version already supports button label styles and the new Touch card.
• Similar features exist in other controller mapping / emulator apps.

Additional Value

This would greatly improve personalization on handheld devices and attract more customization-focused users.

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I am willing to help implement this: Yes (optional)

Any existing discussions or related issues? Feel free to link them!