Require the claim message in the browser

A claim carries no evidence without one. Client-side only - neither the model nor
impound_claims#update turns an empty claim away, which the spec says out loud.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: sethherr

app/components/registrations/show/current_alerts/claim_impound/component.html.erb

@@ -6,8 +6,14 @@
     <% if impound_claim.present? %>
       <% if impound_claim.unsubmitted? %>
         <%= form_with(model: impound_claim, url: impound_claim_path(impound_claim), builder: BikeIndexFormBuilder, data: {controller: "csrf-refresh"}) do |form| %>
+          <%#
+            Required in the browser only - a claim carries no evidence without it, but nothing
+            server-side turns one away for being empty
+          %>
+
           <%= render(UI::Forms::Group::Component.new(form_builder: form, attribute: :message, kind: :text_area,
-            label_text: translation(".prove_its_yours", bike_type: impound_claim.bike_type), html_options: {rows: 4})) %>
+            label_text: translation(".prove_its_yours", bike_type: impound_claim.bike_type), required: true,
+            html_options: {rows: 4})) %>
 
           <%= render(UI::Button::Component.new(text: translation(".save_message"), color: :secondary, kind: :submit)) %>
         <% end %>

app/components/registrations/show/wrapper/component.rb

@@ -8,7 +8,7 @@ module Wrapper
       class Component < ApplicationComponent
         # Digest of the markup inside the cache block — the cached_markup_digest spec
         # keeps it current, following what this tree renders out into UI:: and elsewhere
-        MARKUP_DIGEST = "5762e9b41c69"
+        MARKUP_DIGEST = "fb4cbfb189d9"
 
         def initialize(bike:, current_user:, view:, available_views:, bike_sticker: nil, current_alerts: {})
           @bike = bike

spec/components/registrations/show/current_alerts/claim_impound/component_system_spec.rb

@@ -53,9 +53,15 @@
     it "offers the message form, then carries the outcome once it's answered" do
       visit "#{preview_path}/unsubmitted"
 
-      expect(page).to have_field("Verify your ownership")
+      # Required in the browser, so an empty box won't save - though nothing server-side
+      # turns an empty claim away
+      expect(page).to have_field("Verify your ownership", type: "textarea", valid: false)
       expect(page).to have_button("Save message")
       expect(page).to have_button("Submit claim")
+
+      fill_in "Verify your ownership", with: "it still has my sticker under the seat"
+
+      expect(page).to have_field("Verify your ownership", valid: true)
       # The card is the claim now, rather than an invitation to open one
       expect(page).to have_no_button("Claim found bike")
       expect_axe_clean