Fix text color in dashboard inputs, sanitize remote status content in UI,

simplify FanOutOnWriteService, add /api/accounts/lookup method

app/controllers/api/accounts/lookup_controller.rb

@@ -0,0 +1,11 @@
+class Api::Accounts::LookupController < ApplicationController
+  def index
+    @accounts = Account.where(domain: nil).where(username: lookup_params)
+  end
+
+  private
+
+  def lookup_params
+    (params[:usernames] || '').split(',').map(&:strip)
+  end
+end