Fix TSV processing, queued export crashes, and interface parameter consistency

[imhayatunnabi]

1️⃣ Why should it be added? What are the benefits of this change?

1. TSV Files Work Correctly: Add automatic TSV tab delimiter detection for proper TSV file handling
2. Queued Exports No Longer Crash: Undefined variable $sheetExport causing fatal errors in queued export jobs
3. PHP 8+ Named Parameters Support: Interface parameter names didn't match implementation

2️⃣ Does it contain multiple, unrelated changes? Please separate the PRs out.
No, these changes are closely related and should be kept together: All three fixes address core functional bugs in the Excel processing pipeline

3️⃣ Does it include tests, if possible?
The existing test suite validates these fixes:

4️⃣ Any drawbacks? Possible breaking changes?
Zero Breaking Changes - Fully Backward Compatible

5️⃣ Mark the following tasks as done:

• Checked the codebase to ensure that your feature doesn't already exist.
• Take note of the contributing guidelines.
• Checked the pull requests to ensure that another person hasn't already submitted a fix.
• Added tests to ensure against regression.