feat(mobile): add interactive portfolio performance charts

[Amarjeet325]

Linked Issue

Closes #415

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Type of Change

• feat
• fix
• docs
• refactor
• test
• chore

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Validation

• Lint passed for affected area(s)
• Tests passed for affected area(s)
• Manual verification completed (if applicable)

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Documentation

• Documentation updated (or N/A with explanation)
• Added Portfolio chart feature documentation and usage notes
• Screenshots/videos attached for UI changes

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Checklist

• Branch name uses feat/, fix/, or docs/

• Branch: feat/mobile-portfolio-charts

• Commit messages follow Conventional Commits

• feat(mobile): add interactive portfolio performance charts

• PR scope matches linked issue acceptance criteria

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📈 Feature Summary

• Added line chart to Portfolio screen showing total value over time
• Implemented time range selector (1D, 1W, 1M, ALL)
• Integrated with API: GET /portfolio/history
• Added smooth loading state for better UX
• Ensured high performance rendering using optimized chart library

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🧪 Testing Notes

• Verified chart updates correctly when switching time ranges
• Confirmed smooth transitions and no UI lag
• Handled empty and error states gracefully

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