[Niranjan7407]

Closes #1

What changed

• Preserve the first valid structuredPatch hunk's oldStart from Claude Code Edit/MultiEdit results as an optional startLine on edit events.
• Start the HTML player's edit-diff gutter at that offset so edits deeper in a file show meaningful line numbers.
• Keep the existing line-1 fallback for logs without a structured patch, including older Claude logs and Codex/Gemini sessions.
• Add a synthetic parser regression test for oldStart: 120 and a legacy result without structuredPatch.

How I tested it

• npm run build
• npm test
• Render a synthetic Claude fixture and verify the edit gutter starts at the expected line.
• No real session transcripts included.

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[TanbirRamim]

Merged, thanks @Niranjan7407! Really nice first fix, with a test and the legacy fallback. One thing I found while testing: oldStart is the first line of the hunk including the 3 context lines, so the numbers came out a bit early. I follow up in #28 by finding oldString in originalFile instead. If you like vibereel, a star helps others find it.