Revert "DEV: FloatKit (#23541)" (#23549)

This reverts commits

0623ac684a65f95ce4f5438ff47944b1dc2119f4
408e71e437ef8abf98f93e3449898bf906766b0e
a32fa3b9470dde0543fcee809f2abd1f219f7336

User tips were running into some issues.

plugins/chat/spec/system/react_to_message_spec.rb

@@ -166,6 +166,9 @@ RSpec.describe "React to message", type: :system do
         channel.click_reaction(message_1, "female_detective")
 
         expect(channel).to have_reaction(message_1, "female_detective", "1")
+        expect(
+          channel.find_reaction(message_1, "female_detective")["data-tippy-content"],
+        ).to include(other_user.username)
       end
     end
   end