fix: start line not working in multiple apply diff

[samhvw8]

Related GitHub Issue

Closes: #5018

Description

Fix start line extract from tag not pass into start line applyDiffSingle

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• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
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Important

Fixes start line handling in applySingleDiff to correctly use _paramStartLine in multi-file-search-replace.ts.

• Bug Fix:
  • Fixes start line handling in applySingleDiff in multi-file-search-replace.ts by using _paramStartLine if provided, ensuring correct line number usage in multiple apply diff scenarios.
• Behavior:
  • Ensures startLine is set to _paramStartLine or extracted from match in applySingleDiff.
  • Affects how diffs are applied when multiple diffs are processed in applyDiff.
• Misc:
  • No changes to tests or documentation noted.

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