fix: file edit operation by adding bounds check

[hashemix]

📌 Summary

This PR fixes a potential panic in the apply_file_edits function caused by attempting to access an out-of-range slice when the old_text in an EditOperation has more lines than the file content.

The issue was identified in #19 where a file with 2 lines and an edit with 41 lines triggered a range end index 41 out of range for slice of length 2 panic.

🔍 Related Issues

• Fixes Rust panic at Claude Desktop Start #19

✨ Changes Made

• Added a check in apply_file_edits to verify that old_lines.len() does not exceed content_lines.len() before the line-by-line matching loop.
• Returns an Err with a descriptive message if the edit operation is too large, preventing the panic.
• Added a test case to validate the new error handling behavior.