fix(ui5-toolbar): correct event handlers attachment #10546
Merged
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Fixes: #10415
The Toolbar component now attaches event listeners directly in the template, replacing the previous onEnterDOM approach. This ensures handlers are available immediately after rendering, resolving race conditions and improving test reliability.
Event handling is now managed by the abstract items themselves, rather than the toolbar mediating events. Items fire a new internal "close-overflow" event to notify the toolbar when the overflow menu should close.