feat: search result autoscroll

[weilirs]

No description provided.

[greptile-apps]

PR Summary

This PR implements an autoscroll feature for search results, allowing users to jump directly to relevant content positions when selecting search results.

• Added position tracking in chunking.ts with new functions that maintain character positions in the original document
• Extended the database schema in schema.ts with an optional startPos field to store chunk positions
• Modified DBResultPreview and DBSearchPreview components to pass position information when results are clicked
• Implemented scrolling logic in FileContext.tsx that intelligently finds the best DOM element to scroll to
• Added proper error handling with fallbacks when ideal scroll targets can't be found

Greptile AI

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[greptile-apps]

logic: The currentOffset = chunkPosition + 1 logic might skip content if there are overlapping chunks with identical text. Consider using currentOffset = chunkPosition + chunkText.length to ensure proper progression through the text.

Suggested change

	const chunkPosition = stringInfo.text.indexOf(chunkText, currentOffset)
	if (chunkPosition !== -1) {
	const absolutePosition = stringInfo.pos + chunkPosition
	currentOffset = chunkPosition + 1
	const chunkPosition = stringInfo.text.indexOf(chunkText, currentOffset)
	if (chunkPosition !== -1) {
	const absolutePosition = stringInfo.pos + chunkPosition
	currentOffset = chunkPosition + chunkText.length