Add ability to put previews into sidecar directory (#2061)

* don't prefix preview with _

* Add a changelog entry

* Apply suggestions from code review

* Update docs/CHANGELOG.md

* Update docs/CHANGELOG.md

---------

Co-authored-by: Joel Hawksley <[email protected]>

Author: sethherr

docs/CHANGELOG.md

@@ -10,6 +10,10 @@ nav_order: 5
 
 ## main
 
+* Look for preview files that end in `preview.rb` rather than `_preview.rb` to allow previews to exist in sidecar directory with test files.
+
+    *Seth Herr*
+
 ## 3.13.0
 
 * Add ruby head and YJIT to CI.

lib/view_component/preview.rb

@@ -102,7 +102,7 @@ def preview_source(example)
 
       def load_previews
         Array(preview_paths).each do |preview_path|
-          Dir["#{preview_path}/**/*_preview.rb"].sort.each { |file| require_dependency file }
+          Dir["#{preview_path}/**/*preview.rb"].sort.each { |file| require_dependency file }
         end
       end