refactor(constants): extract magic numbers and strings to named const…

[shogun444]

Summary

Refactors selected parts of the codebase to replace magic numbers and hardcoded strings with named constants, improving readability and maintainability.

A centralized constants file was introduced and used across core modules to eliminate repeated values.

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Closes #205

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Type of change

• Feature
• Bug fix
• Chore / Refactor
• Docs

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Changes

• Added src/constants/app.constants.ts for shared constants

• Replaced magic values in:

  • api.ts
  • apiInterceptors.ts
  • ToastContext.tsx
  • performanceUtils.ts
  • messagingStore.ts

• Minor fixes to ensure build stability after refactoring:

  • resolved duplicate function definition in envValidation.ts
  • fixed JSX parsing issue in ErrorBoundarySystem.tsx

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Testing

• Verified application runs locally with npm run dev

• Confirmed no runtime or console errors after refactor

• Ensured existing functionality remains unchanged

• npm run type-check

• npm run lint

• npm run test

• npm run build

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Notes

• Scope intentionally limited to selected modules to keep the PR focused and reviewable
• No functional behavior changes intended

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[RUKAYAT-CODER]

Kindly resolve conflict

[RUKAYAT-CODER]

Kindly resolve conflict

[shogun444]

@RUKAYAT-CODER I resolved the conflicts please merge