feat(search): Display matched search terms with context highlighting

[vredchenko]

Summary

Highlight matched search terms within surrounding context text in results.

Implementation

For Documentation (MiniSearch)

• Extract ~50 characters before/after matched terms
• Display as snippet in result item

For GitHub API

• Use text_matches field with header: Accept: application/vnd.github.text-match+json
• GitHub provides pre-computed fragments with match info

UI

• Render snippets with <mark> tags for visual emphasis
• Style highlighted terms distinctly

Files to Modify

• webui/src/hooks/useSearch.ts (snippet extraction)
• webui/src/types/search.ts (add snippet field)
• webui/src/components/widgets/SearchPalette/SearchPalette.tsx (display)
• webui/src/components/widgets/SearchPalette/SearchPalette.css (styling)

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From PR #124 review comment (Item 12)