* feat(mobile): refactor mobile chat into modal
- Make page always scrollable
- Move mobile chat into a standalone modal
* fix(test): split out mobile browser test specs
* fix(mobile): force chat button to render on top of footer
* fix: some small updates from review
* fix: hide/show hide chat menu option based on width
* fix: chat button icon getting cut off
* chore(tests): add browser tests for mobile chat modal
* chore(tests): add story for ChatModal component
* fix(test): quiet shellcheck
* fix: remove unused import
* fix(tests): silence storybook linting warning
* fix(ui): reposition chat modal button icon with transform
