fix: trim whitespace from CSV headers during import

[chesta02]

🔗 Related Issue

Closes #558

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📝 Summary of Changes

• Trim leading and trailing whitespace from CSV headers before processing.
• Preserve None header values to avoid errors.
• Ensure headers like " Email " are correctly recognized during import.

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👉 Type of Change

• 🐛 Bug fix
• ✨ New feature
• ♻️ Refactor
• 📝 Documentation update
• 🎨 UI / Style change
• 🔧 Chore

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🧪 Testing

• Tested by reviewing the CSV import logic.
• Verified that headers are stripped before processing.
• Existing functionality remains unchanged for valid CSV files.

Summary by CodeRabbit

• Bug Fixes
  • Improved CSV lead imports by handling extra whitespace in column headers more reliably, reducing mismatches when mapping fields.

[coderabbitai]

📝 Walkthrough

Walkthrough

The import_leads_from_csv task now strips leading and trailing whitespace from CSV header names before using them for field mapping, preserving None entries in the fieldnames list.

Changes

CSV Header Trimming

Layer / File(s)	Summary
Strip whitespace from CSV headers backend/leads/tasks.py	After CSV dialect detection, header names in reader.fieldnames are trimmed of leading/trailing whitespace (preserving None entries) before being used for field mapping.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The change strips whitespace from CSV header names before downstream matching, matching issue #558's import sanitization requirement.
Out of Scope Changes check	✅ Passed	The only described change is header trimming in backend/leads/tasks.py, with no unrelated or extra scope visible.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: trimming whitespace from CSV headers during import.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Kuldeeep18]

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