🔧 Share calculateStats logic with dummyData

[Smartdevs17]

Problem

Duplicated stats calculation logic between store and dummyData.

Context

Inconsistent calculations possible, maintenance overhead.

Proposed Solution

Share logic:

1. Extract stats calculation to shared utility
2. Import in both places
3. Test the shared function
4. Remove duplication

Acceptance Criteria

• Single stats calculation
• Tests pass
• Consistent results
• Less code

Technical Notes

Files:

• src/store/subscriptionStore.ts
• src/utils/dummyData.ts
  New: src/utils/stats.ts

Constraints

• Handle empty data
• Match existing outputs
• Consider performance

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[shoaib050326]

@shoaib050326 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi Maintainer, I want to work on this can you pls assignn it to me.

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[er1c-cartman]

Submitted PR #476 for this issue: #476

Summary:

• extracted shared stats calculation into src/utils/stats.ts
• reused it from both subscriptionStore.calculateStats() and dummyData.getTotalMonthlySpending()
• added focused tests for empty input, billing-cycle conversion, category counts, gas totals, and currency conversion injection

Validation:

• stats smoke check via tsx passed
• Prettier check passed for changed files
• git diff --check passed

Note: local npm ci is currently blocked by upstream dependency metadata (ethers peer conflict and missing @react-native/jest-preset@^0.1.0), so I documented that in the PR body.

[morelucks]

@morelucks has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I'd love to work on this

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