Per the design review, the "Add another provider · Browse providers"
card was a redirect to content one scroll-tick away. A search input
plus kind chips lets users self-segment the catalog and is the right
tool once it grows beyond the four to twelve providers we ship today.
- New providers_filter Stimulus controller — case-insensitive free
text search across name/region/kind, plus a chip group with
All / Banks / Crypto / Investment that toggle visibility via
Tailwind's `hidden` class.
- _search_filters partial: search box (count-pluralized placeholder)
+ chip group, ARIA-labelled and aria-pressed for the chips.
- ProviderCard exposes filter_data (target + name/region/kind data
attrs) so the controller can match without re-rendering.
- Lunchflow's `kind` was "Lunch" — switched to "Bank" so it falls
under the Banks chip alongside its actual offering (it aggregates
banks).
- Drops the add_provider_cta partial and its locale entries; adds
search_filters.* and an empty_filter message.
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