…ebar

Introduces an 'events' property to UmbExtensionSlotElement, allowing dynamic assignment and removal of event listeners on extension components. Event listeners are added when extensions are permitted and removed on disconnect, improving extensibility and event handling for extension slots.

Introduces handlers for entity expansion and collapse events in the section sidebar menu. This change enables the menu to respond to expansion state changes by updating the context accordingly.

Introduces a local expansion state to both section sidebar and tree menu item components to prevent unnecessary updates and rerenders. This improves performance by ensuring state updates only occur when needed.

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