* Add select all controls to media lists
* Refine select-all helper and add coverage
* Adjust select-all button alignment
* Tighten select-all helper semantics
* Allow tests to access internal members
* Rename select-all helper and avoid shift tracking
* Simplify select-all reset helper
* Keep pager centered and move select-all right
* Add missing div
* create test project for main app; move and rename new tests
* remove core => main app reference
* cleanup unused imports
* Fix button behavior when the screen is small
* update changelog
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Co-authored-by: Jason Dove <1695733+jasongdove@users.noreply.github.com>
