Fix ScratchJr paint bucket interior hit testing

[dkrame11]

Summary

• detect clicks inside unfilled SVG shapes using their geometry instead of relying only on painted pixels
• preserve SVG layer ordering when combining native intersection and interior hits
• handle transformed shapes and ignore clip-path geometry
• restore the precise 1×1 native intersection area instead of the unreliable 100×100 workaround

Testing

• verified in Chromium that clicking the center of a large unfilled shape fills that shape without changing the background
• verified transformed path interiors resolve to the path
• ./node_modules/.bin/eslint src/painteditor/Ghost.js
• npm run build

Fixes ENG-7719

[linear-code]

ENG-7719

[dkrame11]

worked for me https://t-03gvxy9nyzelm993qouv8zaxi-p22502.onamp.dev/editions/free/src/editor.html?item_id=portal-test

[toto4tots]

I can't repro the issue on live 🤔
https://www.loom.com/share/33b2de18037842f4870e8274c90fdbc2

[dkrame11]

hmmmmmmm

[dkrame11]

well this doesnt break anything…