2182 prevent nav menu hover flickering#693
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Replace the global mousemove + elementFromPoint poll (which raced the menu's open/close animation and caused open/close flicker) with hover detection driven by real mouseenter/mouseleave on the trigger button and the rendered overlay panel. The <mat-menu> host is a display:none placeholder, so the panel listeners are attached on open to the .cdk-overlay-pane (which stays interactive during the 120ms enter animation). Close fires after a short grace period only when the pointer is over neither element. Also add a visible hover state (background + brighter text) to the header dropdown items.
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Fix the flickering nav menu on hover by removing the global mousemove elemntFromPoint listener with a hoverlistener over both the trigger button and the attached .cdk-overlay-pane.
Issue: hashtopolis/server#2182