chore(frontend): create PasswordInput wrapper with stories DEV-2727

[magicznyleszek]

🗒️ Checklist

1. run linter locally
2. update developer docs (API, README, inline, etc.), if any
3. for user-facing doc changes create a Zulip thread at #Support Docs Updates, if any
4. draft PR with a title <type>(<scope>)<!>: <title> DEV-1234
5. assign yourself, tag PR: at least Front end and/or Back end or workflow
6. fill in the template below and delete template comments
7. review thyself: read the diff and repro the preview as written
8. open PR & confirm that CI passes & request reviewers, if needed
9. act on any greptile review below a 5/5 score or leave comment explaining why you won't
10. delete this checklist section from the final squash commit before merging

💭 Notes

Adds the wrapper so we can have nice stories file for Chromatic.

Also updated how we set colors for disabled inputs and placeholder.

👀 Preview steps

1. ℹ️ Run storybook
2. Go to Design System → PasswordInput
3. Verify it looks good

[greptile-apps]

Greptile Summary

The PR adds a shared PasswordInput wrapper and Storybook examples, migrates RESTServicesForm to the wrapper, enforces its use through ESLint, and updates disabled and placeholder input colors.

• Adds PasswordInput wrapper and stories.
• Migrates RESTServicesForm away from the direct Mantine import.
• Centralizes disabled and placeholder colors through Mantine input variables.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

_{Reviews (2): Last reviewed commit: "typo" | Re-trigger Greptile}