[Remove Vuetify from Studio] Convert Sign In page unit tests to Vue Testing Library

[vtushar06]

Summary

Converted AccountsMain (Sign In page) unit tests from Vue Test Utils to Vue Testing Library, focusing on user-observable behavior instead of implementation details.

Changes:

• Replaced mount() with render() and Vue Testing Library queries
• Simplified Vuex mocking: Using mocks: { $store } instead of createLocalVue (component only uses dispatch/state)
• Minimal stubs: Only PolicyModals stub kept
• 8 comprehensive tests covering all major user workflows

Test Coverage:

• Form rendering and display
• Form validation (empty submission)
• Login failures with error messaging
• Successful login and redirect flow
• Protected page access with ?next= parameter
• Inactive account detection
• Offline state handling

All tests use semantic queries (getByRole, getByLabelText, getByText) and test only user-visible behavior.

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References

• Issue: #5534 (Convert AccountsMain tests to VTL)
• Related: #5536 (CatalogList conversion)

Reviewer guidance

Testing:

• Run the test suite
• pnpm run test -- accountsMain.spec.js
• All 8 tests should pass

…

[vtushar06]

Hii @MisRob, can you please have a look and provide a reviewer for this PR, implementation is complete and If any changes require please let me know.

[MisRob]

Thank you @vtushar06, we will assign a reviewer soon.

I gave it a very quick skim, and I appreciate that you applied all the recent learnings. A reviewer will check on it in more detail, but high-level it looks nice!

[vtushar06]

Hii @LianaHarris360, Thanks for approving and merging this, can you please look into similar PR #5536.

[LianaHarris360]

No problem! And a reviewer has already been assigned to that pull request, they will review it when they have the opportunity :)