Fix find match scrolling

[ThisIs-Developer]

Summary

• Fix find navigation so active matches scroll into view in long wrapped documents.
• Use the editor highlight layer's real wrapped match position instead of estimating by logical line number.
• Keep scroll state tied to the textarea so highlights and line numbers stay aligned with editor scrolling.

Root Cause

Find navigation estimated the target position as lineIndex * lineHeight, which works for short documents but fails when long paragraphs wrap across many visual rows.

Fixes #154.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
markdown-viwer	Ready	Preview, Comment	Jun 4, 2026 5:39pm