🏗 Janis department filters handoff

- Google doc: https://docs.google.com/document/d/14pRxKlIM5G29PnkJPQAdfkzJjCbRTYDQb0Po4ctZb3Y/edit#
- Abstract handoff collection: https://share.goabstract.com/564e4c13-96bf-4309-a01e-fe53a8b58ab1

# Dev criteria
- [ ] "Filter" label: the cumulative number of selected checkboxes should be displayed between the parenthesis, example: "Filter (1)"
- [ ] When filters are applied, the number of results should reflect the filtered total

## Interaction
- Selecting a filter (checkbox = "TRUE")
- Desktop: applies the filter to the list, with no need for user confirmation
- Tablet and mobile: user must select `Show results` to apply filters, if "Back" is selected, any filters selected during that instance will not be applied to the results list.
- Filter heading: updates to show the cumulative number of selected filters
### Mobile
- Clicking `Filters` opens a filter overlay. The background is a dark gray and slightly transparent so that sighted residents will still be able to see their search criteria beneath this overlay.
- [ ] "X" button should close the modal, but not modify any of selection states
- [ ] The number of results should be displayed on the button primary button label "Show # results"

## Keyboard interactions
Close affordances for the `filter` overlay:
- keyboard: escape key
- keyboard: back button
- "X" button: `Back to results`

## Interactive states
`Filter` button
- [ ] Default state
- [ ] Hover state

`Remove all filters` button
- [ ] Default state
- [ ] Hover state