feat(campaigns): add a delete action with a scope-aware confirmation

The dialog says what will actually be destroyed, which differs by case:
a synced MaskanX campaign is deleted on Meta too, an imported one is only
forgotten here, and a draft never reached Meta at all.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/pages/Campaigns/CampaignActions.tsx

@@ -59,6 +59,26 @@ export default function CampaignActions({ campaign, account, onChanged }: Props)
 
   const isImported = campaign.origin === "imported";
 
+  // Deleting a synced campaign also deletes it on Meta, so the dialog says
+  // which of the two is about to happen.
+  const confirmDelete = () => {
+    Modal.confirm({
+      title: "Delete this campaign?",
+      okText: "Delete",
+      okButtonProps: { danger: true },
+      content: (
+        <Paragraph>
+          {isImported
+            ? "MaskanX will forget this campaign. It stays in Meta, where it was created."
+            : campaign.meta_campaign_id
+              ? "This deletes the campaign, ad set and ad on Meta as well. It cannot be undone."
+              : "This campaign was never sent to Meta, so only the MaskanX record is removed."}
+        </Paragraph>
+      ),
+      onOk: () => run("Delete", () => api.deleteCampaign(campaign.id)),
+    });
+  };
+
   return (
     <Space size="small" wrap>
       {campaign.status === "approved" && !isImported && (
@@ -105,6 +125,16 @@ export default function CampaignActions({ campaign, account, onChanged }: Props)
           Stop
         </Button>
       )}
+
+      <Button
+        size="small"
+        danger
+        type="text"
+        loading={busy === "Delete"}
+        onClick={confirmDelete}
+      >
+        Delete
+      </Button>
     </Space>
   );
 }