Dictionary show action for letters, alphabetical links helper

Gemfile.lock

@@ -83,6 +83,15 @@ GEM
     bootsnap (1.16.0)
       msgpack (~> 1.2)
     builder (3.2.4)
+    capybara (3.39.2)
+      addressable
+      matrix
+      mini_mime (>= 0.1.3)
+      nokogiri (~> 1.8)
+      rack (>= 1.6.0)
+      rack-test (>= 0.6.3)
+      regexp_parser (>= 1.5, < 3.0)
+      xpath (~> 3.2)
     concurrent-ruby (1.2.2)
     connection_pool (2.4.1)
     crass (1.0.6)
@@ -145,6 +154,7 @@ GEM
       net-pop
       net-smtp
     marcel (1.0.2)
+    matrix (0.4.2)
     mini_mime (1.1.5)
     minitest (5.20.0)
     msgpack (1.7.2)
@@ -216,6 +226,7 @@ GEM
     rake (13.0.6)
     rdoc (6.5.0)
       psych (>= 4.0.0)
+    regexp_parser (2.8.2)
     reline (0.3.9)
       io-console (~> 0.5)
     responders (3.1.1)
@@ -274,6 +285,8 @@ GEM
     websocket-driver (0.7.6)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
+    xpath (3.2.0)
+      nokogiri (~> 1.8)
     zeitwerk (2.6.12)
 
 PLATFORMS
@@ -283,6 +296,7 @@ PLATFORMS
 
 DEPENDENCIES
   bootsnap
+  capybara
   debug
   devise
   factory_bot_rails