fix: replace raw alert() calls with toast.error() notifications

[Xenon010101]

What

Replace raw browser alert() calls with the project's custom toast notification system.

Root cause

Several admin pages used browser alert() for error feedback, which blocks the main thread, cannot be styled, and creates inconsistent UX compared to the existing toast.error() usage in other files.

Changes

• AdminSkillTestsPage.tsx: Added toast import, replaced 4 alert() calls in catch blocks with toast.error()

Verification

• All replacements follow existing patterns (e.g. ApplicationDetail.tsx, EvaluationsList.tsx)
• No new imports needed beyond toast which already exists in the project

CI failures

N/A

Before

4 catch blocks used alert() for error feedback.

After

All error feedback uses the project's styled toast.error() system.

Closes #1321

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 400c4170-1a59-4e88-81a1-f75165dd7a02

📥 Commits

Reviewing files that changed from the base of the PR and between 0c176ae and 74f4441.

📒 Files selected for processing (1)

• client/src/module/admin/skill-tests/AdminSkillTestsPage.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

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