Long-distance-travel-related overlays

Suggested by Muffinicent:
> a feature that allows you to generate a circle thats 32768 in game pixels wide wherever you want so you can see where you'll end up if you use an LDT wand up or down or diagonally

I think this requires talking to LDT wand designers like koobey to make sure we arent missing anything.

No files, tests, or linked PRs are named in the issue. Start by finding the map overlay/rendering path in the TypeScript code and locate where user-defined shapes or tools are handled, then trace any coordinate conversion from game pixels to map space. Check if LDT/wand-related travel logic already exists and can be reused for endpoint prediction. Done looks like a selectable UI flow that draws a 32768-game-pixel circle at an arbitrary point as a travel preview.

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