Find the Edge install icon under images/external

install-edge.svg lives in app/assets/images/external/, alongside the
other install icons, but the Edge branch of pwa/_install_instructions
asked for it at the top level. Propshaft raises MissingAssetError, so a
browser the useragent gem reports as Edge got a 500 on the profile page
and anywhere else the partial renders.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/views/pwa/_install_instructions.html.erb

@@ -9,7 +9,7 @@
     <% case
       when platform.edge? %>
         <ol>
-          <li>Click <em><%= image_tag "install-edge.svg", alt: "the app available - install Campfire chat button", size: 16 %></em>in the address bar.</li>
+          <li>Click <em><%= image_tag "external/install-edge.svg", alt: "the app available - install Campfire chat button", size: 16 %></em>in the address bar.</li>
           <li>Click <em>Install</em>.</li>
         </ol>
       <% when platform.chrome? && platform.android? %>

test/controllers/users/profiles_controller_test.rb

@@ -11,6 +11,13 @@ class Users::ProfilesControllerTest < ActionDispatch::IntegrationTest
     assert_response :success
   end
 
+  test "show includes install instructions for Edge" do
+    get user_profile_url, headers: { "User-Agent" => "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 Edge/18.18363" }
+
+    assert_response :success
+    assert_select ".pwa__instructions img[src*='install-edge']"
+  end
+
   test "update" do
     put user_profile_url, params: { user: { name: "John Doe", bio: "Acrobat" } }