Description

Fixes the layout of the invite collaborator form where the "Share" button was being pushed down to a new line when sharing a space. The changes include:

• Replaced oc-flex-wrap with oc-flex-middle on the main action row to vertically center items and prevent wrapping
• Added oc-flex-nowrap to the button container to keep the expiration indicator and share button on the same line
• Moved the "Notify via mail" checkbox out of the flex row into its own block-level container, so it no longer affects the
  button positioning
• Added white-space: nowrap to the share button to prevent its text from breaking across lines

Related Issue

• Fixes https://kiteworks.atlassian.net/browse/OCISDEV-862

Motivation and Context

When sharing a space, the additional UI elements (role dropdown, expiration indicator) caused the "Share" button to be pushed below the action row. This made the form look broken and was confusing to users.

How Has This Been Tested?

• test environment: local dev server with oCIS backend
• test case 1: Open sidebar → share a space with a user → verify the Share button stays inline with the role dropdown
• test case 2: Set an expiration date → verify the expiration indicator, share button, and role dropdown all remain on the same row
• test case 3: Regular file/folder sharing still renders correctly