test: validate svg generator xml output

[saurabhhhcodes]

Adds XML parser validation coverage for the SVG generator outputs so malformed markup is caught in tests instead of slipping through to rendering.\n\nValidation:\n- npm test -- --run lib/svg/generator.test.ts\n\nCloses #5280

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Unfortunately, this PR has been automatically closed because you are not assigned to the linked issue #5280 — test: Add XML validation checks for SVG generator outputs.

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[Aamod-Dev]

Excellent XML validation! I went through the changes and adding dedicated XML linting on the generator output ensures our SVGs will always pass browser validity checks.
Labels applied:

• level:intermediate: XML document parsing.
• quality:clean: Validates generator paths.
• ype:testing: Secures image outputs.