feat: add \skip_confirm_for_delete\ option

Problem: there was no way to suppress the confirmation popup when the
only pending operations are deletes. \`skip_confirm_for_simple_edits\`
explicitly excludes deletes, so users who delete frequently had no opt-out.

Solution: add \`skip_confirm_for_delete = false\` config option. When true,
\`confirmation.show()\` skips the popup if every pending action is a delete.

Based on: stevearc/oil.nvim#392

lua/canola/mutator/confirmation.lua

@@ -67,6 +67,19 @@ M.show = vim.schedule_wrap(function(actions, should_confirm, cb)
     cb(true)
     return
   end
+  if should_confirm == nil and config.skip_confirm_for_delete then
+    local all_deletes = true
+    for _, action in ipairs(actions) do
+      if action.type ~= 'delete' then
+        all_deletes = false
+        break
+      end
+    end
+    if all_deletes then
+      cb(true)
+      return
+    end
+  end
 
   -- Create the buffer
   local bufnr = vim.api.nvim_create_buf(false, true)