fix(modal): Updated imports in standalone modal preview examples

[GayatriK2002]

💡 What is the current behavior?

• ModalService imported from @siemens/ix-angular fails with "no provider found" error

GitHub Issue Number: #2060
Jira Issue Number: 3296

🆕 What is the new behavior?

• ModalService imported from @siemens/ix-angular/standalone works correctly with proper provider setup

🏁 Checklist

A pull request can only be merged if all of these conditions are met (where applicable):

• 🦮 Accessibility (a11y) features were implemented
• 🗺️ Internationalization (i18n) - no hard coded strings
• 📲 Responsiveness - components handle viewport changes and content overflow gracefully
• 📕 Add or update a Storybook story
• 📄 Documentation was reviewed/updated siemens/ix-docs
• 🧪 Unit tests were added/updated and pass (pnpm test)
• 📸 Visual regression tests were added/updated and pass (Guide)
• 🧐 Static code analysis passes (pnpm lint)
• 🏗️ Successful compilation (pnpm build, changes pushed)

👨‍💻 Help & support

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1e8a867

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud