Added letter_opener

Gemfile.lock

@@ -93,6 +93,8 @@ GEM
       rack-test (>= 0.6.3)
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
+    childprocess (5.1.0)
+      logger (~> 1.5)
     concurrent-ruby (1.3.3)
     connection_pool (2.4.1)
     crass (1.0.6)
@@ -134,6 +136,11 @@ GEM
       activesupport (>= 5.0.0)
     json (2.7.2)
     language_server-protocol (3.17.0.3)
+    launchy (3.0.1)
+      addressable (~> 2.8)
+      childprocess (~> 5.0)
+    letter_opener (1.10.0)
+      launchy (>= 2.2, < 4)
     logger (1.6.0)
     loofah (2.22.0)
       crass (~> 1.0.2)
@@ -352,6 +359,7 @@ DEPENDENCIES
   importmap-rails
   inline_svg (~> 1.9)
   jbuilder
+  letter_opener
   pdf-reader (~> 2.12)
   puma (>= 5.0)
   rails (~> 7.2.0, >= 7.2.0)