Fix exported SVG block sizing

[oiahoon]

Summary

• exclude the computed block-size when copying root styles into exported SVGs
• keep unrelated computed styles and child style copying unchanged
• add dedicated regression coverage for every excluded root property

Testing

• focused SVG exporter regression: 5 passed
• TypeScript project build: passed
• ESLint on changed files: passed
• full Vitest suite: 210/223 passed; untouched master is 205/218 with the same 13 JSX assertion failures caused by the current transform injecting __self and __source attributes

Fixes #520

[gfontorbe]

Hi @oiahoon, thanks for the contribution.

Would you mind adding tests for the other excluded properties as well? Each should get it's own dedicated test case.

Also, please sign the Eclipse Contributor Agreement via your Eclipse Foundation account in order for this PR to be considered.

[oiahoon]

Hi @oiahoon, thanks for the contribution.

Would you mind adding tests for the other excluded properties as well? Each should get it's own dedicated test case.

Also, please sign the Eclipse Contributor Agreement via your Eclipse Foundation account in order for this PR to be considered.

surely.

[oiahoon]

Addressed in 39732ad. Added dedicated tests for width, height, opacity, inline-size, and block-size; the focused tests, TypeScript build, and ESLint pass. The ECA check is also passing now.