feat: add MarkdownRenderer component with DOMPurify sanitisation#545
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Pure-function markdown-to-HTML pipeline covering headings, lists, code blocks, bold/italic, links, images, blockquotes, and HR. DOMPurify allowlist ensures XSS safety. 23 Vitest tests, all green. Closes rinafcode#529
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Summary
src/components/shared/MarkdownRenderer.tsx— amarkdownToHtml()pure function and<MarkdownRenderer>React componentDOMPurify.sanitize()with a strict allowlist — XSS-safesrc/components/shared/MarkdownRenderer.test.ts— 23 Vitest tests, all passingTest plan
npx vitest run src/components/shared/MarkdownRenderer.test.ts— 23/23 green<script>,onerrorattribute stripped by DOMPurifyCloses #529