feat: add tileMode option to 9-slice sprites

[JustKira]

Summary

Adds per-region tiling support for 9-slice sprites via a new tileMode option in the slice9 config.

New Options

• 'none' - stretch all regions (default, existing behavior)
• 'edges' - tile edge regions, stretch center
• 'center' - tile center region, stretch edges
• 'all' - tile both edges and center

Corners never tile.

Usage

loadSprite('panel', '/sprites/panel.png', {
    slice9: {
        left: 32, right: 32, top: 32, bottom: 32,
        tileMode: 'edges',
    },
});

Changes

• Extended NineSlice type with tileMode property
• Modified 9-slice rendering to apply tiling per-region
• Added warning when deprecated tiled option is used with slice9
• Added example slice9Tiled.js with test sprites

Example

Screen.Recording.2026-01-02.at.6.38.22.AM.mov

• Changeloged

[JustKira]

Small Note i dont understand why some code changed even i Ran the format but it seems format changed? not sure. but changes are like 10lines or less other are noise not sure if its from my Editor or not.

[mflerackers]

Did you run npm run fmt?

[JustKira]

Did you run npm run fmt?

Yes i did

[lajbel]

LGTM, very high-quality PR.