test: improve coverage for main.tsx

[Sparshagarwal29]

Description

Improves test coverage for main.tsx .

• Fixes: Add test suites for Frontend files to bump overall coverage #352

Checklist

• Ran npx prettier --write . (for formatting)
• Ran npm test (for JS/TS testing)
• Added unit tests
• Verified all tests pass
• Ran gofmt -w . (not applicable – frontend only)
• Updated documentation (not required)

Additional Notes

After change :

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