fix(core/dropdown): spacing and color

[matthiashader]

💡 What is the current behavior?

• icon color not correct
• text to narrow on the icon

GitHub Issue Number: #N/A, [IX-707]

🆕 What is the new behavior?

• Icon has var(--theme-color-std-text) as color
• dropdown-item-text has padding-left: 0.25rem

🏁 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: 9f60215ee486e58281956e03f4af3f04fbe958c8

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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