feat(default-theme): add built-in local search

[LadyBluenotes]

Summary

• add opt-in local full-text search with prefix and fuzzy matching
• build the index from page titles, descriptions, headings, and Markdown content
• scope results to the current locale, project, and version
• lazy-load the search UI, engine, and index
• preserve hosted Algolia DocSearch support
• add keyboard navigation, responsive styling, and configurable labels
• support page exclusion with search: false
• document setup and configuration

Closes #129

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commit: 9a3582b

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	pagefind@​1.5.2

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