fix(core/push-card): adjust colors and v3 adaptions

[matthiashader]

💡 What is the current behavior?

• hover / active color wrong
• wrong variant names: insigth, notification
• wrong property name: notification

GitHub Issue Number: #N/A, [IX-691], [IX-346]

🆕 What is the new behavior?

• right hover / active color
• variant insigth -> outline
• variant notifitcation-> filled
• property notification -> header

🏁 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
• [ ] 📄 Documentation was reviewed/updated (pnpm run 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[bot]]

🦋 Changeset detected

Latest commit: 424f8b3ee6f94b01efa1b473f4bad99eecea8972

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

| Name | Type | | ------------------- | ----- | | @siemens/ix | Patch | | @siemens/ix-angular | Patch | | @siemens/ix-react | Patch | | @siemens/ix-vue | Patch |

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[github-actions[bot]]

Report of strictNullChecks (strictPropertyInitialization) check

😢 Total errors increased in PR branch: 1

Increased errors in PR branch: src/components/push-card/push-card.tsx - 1 errors

- src/components/push-card/push-card.tsx:33:11 ` Property 'notification' has no initializer and is not definitely assigned in the constructor.` - src/components/push-card/push-card.tsx:39:11 ` Property 'header' has no initializer and is not definitely assigned in the constructor.` - src/components/push-card/push-card.tsx:44:11 ` Property 'heading' has no initializer and is not definitely assigned in the constructor.` - src/components/push-card/push-card.tsx:49:11 ` Property 'subheading' has no initializer and is not definitely assigned in the constructor.` - src/components/push-card/push-card.tsx:69:11 ` Type '"std" | undefined' is not assignable to type 'TypographyColors'. Type 'undefined' is not assignable to type 'TypographyColors'.`