fix(provider/metadata): add plaid_eu entry

`plaid_eu` is registered as a separate Provider::ConfigurationRegistry
entry but had no Provider::Metadata row, so its card in the
Available grid fell through to the gray-500 default and rendered
empty (no region, kind, tier, or tagline). The title also came out
as "Plaid Eu" because `titleize` doesn't know "EU" is an initialism.

- Add a `plaid_eu` row to Provider::Metadata::REGISTRY with the same
  shape as `plaid` (US → EU, otherwise identical).
- Introduce an optional `name:` field in metadata; controller falls
  back to it before titleizing the provider key. Lets `plaid_eu`
  render as "Plaid EU".
- Add the missing `settings.providers.taglines.plaid_eu` translation.

app/controllers/settings/providers_controller.rb

@@ -301,11 +301,12 @@ class Settings::ProvidersController < ApplicationController
     # view to render either a provider_form or a family panel partial.
     def build_provider_entries
       configuration_entries = @provider_configurations.map do |config|
+        meta = Provider::Metadata.for(config.provider_key)
         {
           provider_key: config.provider_key.to_s,
-          title: config.provider_key.to_s.titleize,
+          title: meta[:name] || config.provider_key.to_s.titleize,
           configuration: config,
-          maturity: Provider::Metadata.for(config.provider_key)[:maturity],
+          maturity: meta[:maturity],
           summary: view_context.provider_summary(config.provider_key)
         }
       end

app/models/provider/metadata.rb

@@ -78,6 +78,15 @@ class Provider
         maturity: :stable,
         logo_bg: "bg-indigo-600",
         logo_text: "PL"
+      },
+      plaid_eu: {
+        name: "Plaid EU",
+        region: "EU",
+        kind: "Bank",
+        tier: "Paid",
+        maturity: :stable,
+        logo_bg: "bg-indigo-600",
+        logo_text: "PL"
       }
     }.freeze
 

config/locales/views/settings/en.yml

@@ -231,6 +231,7 @@ en:
         indexa_capital: Track your Indexa Capital automated investment portfolio.
         sophtron: Connect US & Canadian banks and utilities.
         plaid: Connect thousands of US financial institutions via Plaid.
+        plaid_eu: Connect European financial institutions via Plaid (PSD2 / Open Banking).
       search_filters:
         aria_label: Search providers
         placeholder: