[Bug Fix] Fix /docs/dropdown_menu 404 (#428) (#429)

* [Bug Fix] Fix DropdownMenu docs example: replace nonexistent DialogClose

The 'Non-navigational item' example (added in #427) referenced a
DialogClose component that does not exist in the gem. VisualCodeExample
evaluates the snippet at render time, so it raised NoMethodError and the
whole /docs/dropdown_menu page failed to render.

Close the dialog with the documented pattern instead: a Button wired to
click->ruby-ui--dialog#dismiss (same approach used in dialog_docs.rb).

Fixes #428

* [Bug Fix] Dispatch exceptions through the router so 500s aren't masked as 404

config.exceptions_app pointed at a lambda that always rendered the
not_found action, so every unhandled error (including 500s such as a
raising view) surfaced as a 404. That masked the DropdownMenu render
error behind a misleading 'not found' page.

Point exceptions_app at the router instead; the /404 and /500 routes
already exist, so the response status now matches the actual error and
ErrorsController#internal_server_error is finally reachable.

Author: djalmaaraujo

docs/app/views/docs/dropdown_menu.rb

@@ -43,7 +43,7 @@ def view_template
                       DialogDescription { "This action cannot be undone." }
                     end
                     DialogFooter do
-                      DialogClose { Button(variant: :destructive) { "Delete" } }
+                      Button(variant: :destructive, data: { action: 'click->ruby-ui--dialog#dismiss' }) { "Delete" }
                     end
                   end
                 end

docs/config/application.rb

@@ -24,6 +24,9 @@ class Application < Rails::Application
     # config.time_zone = "Central Time (US & Canada)"
     # config.eager_load_paths << Rails.root.join("extras")
 
-    config.exceptions_app = ->(env) { ErrorsController.action(:not_found).call(env) }
+    # Dispatch exceptions through the router (see the /404 and /500 routes) so the
+    # response status matches the actual error. A bare lambda to a single action
+    # rendered every failure as 404, masking 500s (e.g. a raising view) as "not found".
+    config.exceptions_app = routes
   end
 end