Add logic to show/hide transcripts without JS

src/invidious/routes/watch.cr

@@ -38,6 +38,11 @@ module Invidious::Routes::Watch
     nojs ||= "0"
     nojs = nojs == "1"
 
+    show_transcripts = env.params.query["show_transcripts"]?
+
+    show_transcripts ||= "0"
+    show_transcripts = show_transcripts == "1"
+
     preferences = env.get("preferences").as(Preferences)
 
     user = env.get?("user").try &.as(User)
@@ -156,6 +161,13 @@ module Invidious::Routes::Watch
     }
     captions = captions - preferred_captions
 
+    if show_transcripts
+      # Placeholder
+      transcript = true
+    else
+      transcript = nil
+    end
+
     aspect_ratio = "16:9"
 
     thumbnail = "/vi/#{video.id}/maxres.jpg"