Fix error pages to handle non-HTML format requests

- Add respond_to blocks in ErrorsController to handle different formats
- Return appropriate HTTP status codes for non-HTML requests (JSON, XML, etc.)
- Update ApplicationController#not_found to handle format types
- Prevents ActionView::MissingTemplate errors for text/json requests

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: Shpigford

app/controllers/application_controller.rb

@@ -17,10 +17,15 @@ class ApplicationController < ActionController::Base
   end
 
   def not_found
-    if Rails.env.production? || Rails.env.development?
-      render "errors/not_found", status: :not_found
-    else
-      render file: Rails.root.join("public", "404.html"), status: :not_found, layout: false
+    respond_to do |format|
+      format.html do
+        if Rails.env.production? || Rails.env.development?
+          render "errors/not_found", status: :not_found
+        else
+          render file: Rails.root.join("public", "404.html"), status: :not_found, layout: false
+        end
+      end
+      format.any { head :not_found }
     end
   end
 

app/controllers/errors_controller.rb

@@ -5,27 +5,43 @@ def show
     exception = request.env["action_dispatch.exception"]
     status_code = ActionDispatch::ExceptionWrapper.new(request.env, exception).status_code
 
-    case status_code
-    when 404
-      render "not_found", status: :not_found
-    when 422
-      render "unprocessable_entity", status: :unprocessable_entity
-    when 500
-      render "internal_server_error", status: :internal_server_error
-    else
-      render "internal_server_error", status: :internal_server_error
+    respond_to do |format|
+      format.html do
+        case status_code
+        when 404
+          render "not_found", status: :not_found
+        when 422
+          render "unprocessable_entity", status: :unprocessable_entity
+        when 500
+          render "internal_server_error", status: :internal_server_error
+        else
+          render "internal_server_error", status: :internal_server_error
+        end
+      end
+      format.any do
+        head status_code
+      end
     end
   end
 
   def not_found
-    render status: :not_found
+    respond_to do |format|
+      format.html { render status: :not_found }
+      format.any { head :not_found }
+    end
   end
 
   def internal_server_error
-    render status: :internal_server_error
+    respond_to do |format|
+      format.html { render status: :internal_server_error }
+      format.any { head :internal_server_error }
+    end
   end
 
   def unprocessable_entity
-    render status: :unprocessable_entity
+    respond_to do |format|
+      format.html { render status: :unprocessable_entity }
+      format.any { head :unprocessable_entity }
+    end
   end
 end