UIIN-3625: The page reloads instead of showing "Confirm move" modal when moving holdings to another instance in member tenant

[mariia-aloshyna]

Purpose

Fix a first-click failure in ECS holdings move flow where clicking Move to could trigger a page reload/remount instead of opening the confirmation modal, especially for instances with multiple holdings and acquisition-linked data.

Approach

• Added explicit button semantics and guarded pointer/click events to prevent unintended parent/default behavior.
• Safely handles unresolved/invalid linked holdings before rendering modal content.
• Normalizes holdings IDs used in move/linkage logic to avoid invalid entries.
• Uses correct tenant source in modal holdings context.

Refs

https://folio-org.atlassian.net/browse/UIIN-3625

Screenshots

[sonarqubecloud]

Quality Gate failed

Failed conditions
48.5% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud