Fix: Prevent Dashboard Crash from Unsafe Date Parsing

[TanCodeX]

Summary

Closes #224

This PR improves the stability of src/pages/Dashboard.jsx by adding safe handling for transaction date parsing. It prevents runtime crashes caused by invalid or improperly formatted date strings.

Previously, the getMonth helper assumed all transaction dates were valid, which could lead to a RangeError when format() is called on an invalid date.

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Changes Made

• Added validation for parsed dates in getMonth helper

• Ensured invalid, empty, or undefined dateStr values are safely handled

• Prevented format() from being called on invalid Date objects

• Added fallback behavior for corrupted or malformed transaction dates

  • Invalid entries are skipped or safely ignored in grouping logic

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Why This Matters

• Prevents full Dashboard crashes (white screen of death)
• Improves resilience against bad or inconsistent data
• Makes date handling robust across all transaction inputs
• Ensures UI remains stable even when data is partially corrupted

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Behavior Change

• Before: Invalid date → app crash ❌
• Now: Invalid date → safely ignored / handled gracefully ✅

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Testing

• Pass valid date strings → months render correctly
• Pass empty/null/invalid dates → Dashboard does not crash
• Mix valid + invalid data → only valid entries are processed

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Impact

• Improved application stability
• Safer data processing in Dashboard
• Better user experience with corrupted or incomplete data

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[TanCodeX]

@khanirfan18 Please review!!

[TanCodeX]

@khanirfan18 review!

[TanCodeX]

@khanirfan18 level?