Adds 'Filters' pattern page

[jtamiace]

Description

Part of the In docs we trust project

Adds specs and behaviors for these components as they relate to filtering:

• Dropdown menus
• Text input dropdowns
• Text filters
• Checkbox lists

Reviewer guidance

This new page documents specs for our current use of filters. Looking for feedback on anything that's missing, inaccurate, or under-specced.

Comments

Later I'll add two follow up issues that I couldn't document for now because of inconsistencies & undesirable behaviors, and the fact that library implementation would need to happen first or in tandem:

• Multi-select dropdown filters: we need a better representation of multiple selections at one time and how long text is handled
• This new page states that when there are '0 results' for a filter in a dropdown, we should hide that option from the dropdown. In the future, we should also communicate the number of missing options in a filter dropdown menu and why they are hidden via a tooltip.

[indirectlylit]

this looks great!