test : added unit tests for toastStore

[tmdeveloper007]

Closes #2059.

Summary of What Has Been Done:
Added unit tests for the toastStore notification system.

Changes Made:

• Created Frontend/src/store/toastStore.test.js with 10 test cases
• Uses zustand store directly (no Supabase dependencies)
• Uses vitest fake timers for duration-based auto-removal tests
• Tests showToast with different types, removeToast, non-existent id handling, and multiple toasts
• Verifies Infinity duration prevents auto-removal

Impact it Made:

• Ensures notification system works reliably across the app
• Guards against timer leaks and stale toast references
• All 10 tests pass (verified with vitest run)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: a032bd6a-3fec-4d5a-aecf-de528e6a5f93

📥 Commits

Reviewing files that changed from the base of the PR and between da8faf2 and 055a49c.

📒 Files selected for processing (1)

• Frontend/src/store/toastStore.test.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[riteshbonthalakoti]

Hi @tmdeveloper007! Thanks for the contribution. I have triaged your PR and set it to merge into the gssoc branch.

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[tmdeveloper007]

Hi @ritesh-1918, this PR was merged but does not have GSSoC labels applied. Could you please add the appropriate labels (e.g. gssoc, gssoc:approved, level:beginner/level:advanced, type:testing/type:bug/type:docs etc.) so the contribution is properly tracked for GSSoC? Thank you!