FIX: Use subfolder-safe url for category in html view (#24595)

Use subfolder-safe url for category in html view

spec/views/topics/show.html.erb_spec.rb

@@ -4,7 +4,22 @@ require "rails_helper"
 require "ostruct"
 
 RSpec.describe "topics/show.html.erb" do
-  fab!(:topic)
+  fab!(:category)
+  fab!(:topic) { Fabricate(:topic, category: category) }
+
+  it "uses subfolder-safe category url" do
+    set_subfolder "/subpath"
+    topic_view = OpenStruct.new(topic: topic, posts: [])
+    topic_view.stubs(:summary).returns("")
+    view.stubs(:crawler_layout?).returns(false)
+    assign(:topic_view, topic_view)
+    assign(:breadcrumbs, [{ name: category.name, color: category.color }])
+    assign(:tags, [])
+
+    render template: "topics/show", formats: [:html]
+
+    assert_select "a[href='/subpath/c/#{category.slug}/#{category.id}']"
+  end
 
   it "add nofollow to RSS alternate link for topic" do
     topic_view = OpenStruct.new(topic: topic, posts: [])