Fix single-tile export: scale tile instead of cropping in canvas stit…

[jacksonTerror]

…ch (resolves #26)

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[jacksonTerror]

Fixes the “single tile” download exporting a cropped quadrant of a 512×512 tile.
Root cause: canvas stitch used hardcoded 512 draw/step, so exporting 256×256 drew the source at 512 and advanced by 512, effectively cropping instead of scaling.
Change: stitchImages() now draws the full source tile and scales to an optional tileSize for the download; 256×256 export passes 256.
Other downloads remain unchanged.

Result: 256×256 single-tile export now tiles seamlessly (matches the preview). No impact to preview grid or larger wallpaper exports.

File touched: pages/index.js only.

Reference: fixes #26.

Thanks for maintaining TileMaker! I love this app. Sometimes I just come here to think of things and see how they tile, it's relaxing!

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Project	Deployment	Preview	Comments	Updated (UTC)
tilemaker	Ready	Preview	Comment	Aug 25, 2025 3:43pm

[zeke]

Thanks for the PR!

Let's ship this an see how it goes.

[jacksonTerror]

Looks to be working! Honored to have contributed.