This PR fixes the bulk invite input overflow: cap to 4 rows and keep the role selector fixed. Closes https://linear.app/rilldata/issue/APP-145/bulk-adding-of-users-leads-to-invite-cta-hidden-off-screen

To test: copy and paste below

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Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!