Fixes for task creation in content releases, Portable Text annotation popovers, URI validation, and more

This release fixes several key issues including task creation in content releases, document menu functionality when annotation editors are open, URI validation for custom schemes, asset selector access for custom roles, and menu layout problems in narrow panes.

• Fixes an issue where Tasks could not be created or edited while a content release or a variant was selected in the studio. Creating a task in a release now links it with the release document, following the same behaviour as comments.
• Fixes the document pane ellipsis menu (History, Duplicate, Inspect, Compare versions, etc.) closing itself when opened while a Portable Text annotation editor is on screen. The menu now stays open and its items work.
• Rule.uri({ scheme }) now respects the custom scheme when combined with other rules in a validation array, so schemes such as mailto: and tel: are no longer wrongly rejected.
• Fixes an error that prevented users on custom roles with attribute-based grants from loading the default image and file asset selector.
• Fixes the "Copy version to" sub-menu inside the release version-chip context menu overlaying "Discard version" (and other parent menu items) when the document pane is narrow. The sub-menu now always opens side-to-side, never downwards.