refactor(aria/accordion): simplify code by using template references instead of user id to match panels with triggers#32855
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…instead of user id to match panels with triggers
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This CL refactors the Angular Components ARIA accordion to simplify how triggers are associated with their content panels.
Previously, ngAccordionTrigger and ngAccordionPanel were matched using a shared panelId string input. This required the ngAccordionGroup to query for all triggers and panels and link them up after they were rendered.
This change replaces the panelId system with a more direct approach:
The ngAccordionPanel is now given a template reference variable (e.g., #myPanel).
The corresponding ngAccordionTrigger now takes the template reference variable as an input (e.g., [panel]="myPanel").
This allows Angular to directly link the trigger and panel instances, removing the need for the group to match them based on IDs and eliminating the AccordionPanelPattern class. The logic for finding the active trigger based on an element has been moved into the AccordionGroupPattern.