- Count pricing issues only for models an enabled channel serves, under
  its own name, a case variant or an alias. Stale saved prices still count.
- List built-in prices only when they are saved or a channel serves them.
- Keep deletions as drafts: a deleted row stays in the table with Undo
  until saved, and a row without a saved price has no delete action.
- Show old and new prices on changed rows and in the editor, and confirm
  every save with a per-model list of current and new prices.
- Count and confirm expression price edits; the form fields now take
  precedence over the option keys loaded with the page.
- On phones, give the tabs their own scrollable row and move secondary
  actions into a menu.