feat(integration): add image variants section and standardize code snippets

features/api_keys_screen.feature

@@ -155,7 +155,7 @@ Feature: API keys screen
       "\"Nightly media import\" is ready. Copy the key and store it somewhere safe."
     And a warning alert (UAlert, color warning, triangle-alert icon) reads "You won't be able to
       see this key again."
-    And the full key from the response is shown in a monospace box with a "Copy" button (icon copy)
+    And the full key from the response is shown in a CodeSnippet with the single tab "API key" and a "Copy" button (icon copy, accessible name "Copy code"), focused when the modal opens
     And the note "Closing this window discards the key from the screen. Copy it first." is shown
     And the only button is a primary "Done"
 
@@ -181,8 +181,7 @@ Feature: API keys screen
     Given the key reveal is open
     When the user activates "Copy"
     Then the full key is written to the clipboard
-    And the button shows icon check and text "Copied" in the success color, announced to assistive
-      technology
+    And the button shows icon check and text "Copied" in the success color, announced politely
     When 2 seconds elapse
     Then the button reverts to icon copy and text "Copy"