test: add mock integration tests for ProfileOptimizerModal

[Tuba1809]

Description

Fixes #2691

Adds mock integration tests for ProfileOptimizerModal focusing on async state transitions using Vitest fake timers. The tests ensure reliable behavior of the loading pipeline and modal reset logic.

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Bug fix, refactoring, docs)

Visual Preview

Not applicable (test-only change)

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally (npx vitest run).
• I have run npm run format and npm run lint locally and resolved all errors.
• My commits follow the Conventional Commits format (e.g., test: ...).
• I have updated README.md if required.
• I have started the repo.
• I have made sure that I have only one commit to merge in this PR.
• The changes maintain existing UI/logic stability and do not introduce breaking changes.
• (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

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[Aamod007]

LGTM! Mock integrations and timer tests are very well implemented.