refactor: extract duplicated CSV fetch logic into a single reusable function in useCSVData

[Harshit-Mishra2212]

📌 Description

In useCSVData.ts, the CSV fetch and parse logic was written out twice in full - once inside the useEffect as fetchCSV, and
again inside mutate. Both functions made the same fetch call to the same URL, used the same PapaParse config, set the same state variables, and logged the same console messages. They were identical in every way.

This meant any change to fetch behaviour, parse config, error handling, or logging had to be applied in two places. The two copies had already drifted slightly in their console.log messages ('Fetching CSV data...' vs 'Manually refreshing CSV data...') even
though they do the same thing.

No related issue.

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✅ Changes

• Refactor

• Extracted fetch and parse logic into a single loadCSV function wrapped in useCallback

• useEffect now calls loadCSV directly instead of defining its own copy

• mutate is now just loadCSV - no separate implementation

• Extracted the CSV URL into a CSV_URL constant so it is defined once at the top of the file

• Added useCallback import alongside existing React imports

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📷 Screenshots / Demo

Not applicable - internal hook refactor with no UI changes.

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Checklist

• I have tested this code
• I have added necessary documentation
• I have linked relevant issue(s)
• I followed the code style of the project
• I reviewed my own code

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