Several issues in the shared docs `Select` component (used by the API
reference package filter):
- The options list never scrolled: its element used a class with no styles,
so the intended max-height/overflow rule was dead. Point it at the styled
class so long lists scroll within the popover.
- Selecting an option now closes the popup instead of leaving it open.
- Clip the trigger and popover corners (overflow: hidden) so their rounded
borders render cleanly, and align the popover width with the trigger.
- Drop the selected-option checkmark. The component is single-select and
already marks the selection with a highlight, so the tick was misleading.
- Remove the unused `disabled` input.
To increase the ease of development we are moving @angular/docs into the adev directory within this repo. While
we are doing this to improve our development experience in the short term, efforts are also in place
to maintain a division between this @angular/docs (shared) code and adev itself, so that it can be extracted
back out in the future when components is ready to leverage it as well.
PR Close#57132
yamanerkam