FIX: Preserve current converters when restoring sent prompts

frontend/README.md

@@ -34,8 +34,12 @@ For single-turn targets or targets that cannot replay the first prompt as histor
 without copying the response. After a successful single send, **Undo last send**
 also restores the prompt in a new conversation, if the target can replay the
 preceding history. Both actions restore the saved prompt and converter results
-for text, image, audio, video, and mixed responses. They do not overwrite new
-prompt edits or changed converter pipelines.
+for text, image, audio, video, and mixed responses when the converter pipeline
+has not changed. If you change the pipeline, both actions keep your
+current converters and temporary settings, restore the original prompt, and
+discard the old conversion results. You can then convert the prompt again.
+Neither action overwrites new prompt or working-input edits, sends a prompt,
+or runs a converter.
 When you save an edited conversation, its final user turn moves to the prompt
 box instead of saved history. Text and attachments retain their metadata,
 including text-only video remix IDs. You can enter and edit prompts without a target.

frontend/e2e/chat-recovery.spec.ts

@@ -708,7 +708,7 @@ test.describe("Chat processing recovery @seeded", () => {
     });
   }
 
-  test("warns about lost converter choices when recovering a saved failure to a new attack", async ({
+  test("restores original media when recovering a saved failure to a new attack", async ({
     page, request, localTarget, imageConverterId,
   }) => {
     await page.getByTestId("file-input").setInputFiles({
@@ -747,7 +747,6 @@ test.describe("Chat processing recovery @seeded", () => {
     await expect(page).toHaveURL((url: URL) => url.pathname.includes(created.attack_result_id));
     await expect(page.getByTestId("chat-input")).toHaveValue("Restore the original image");
     await expect(page.getByRole("button", { name: `Remove ${originalImage.original_filename}`, exact: true })).toBeVisible();
-    await expect(page.getByText(/Converter choices could not be restored/)).toBeVisible();
     await expect(page.getByTestId("clear-media-conversion-image")).toHaveCount(0);
     await expect(page.getByTestId(/^message-bubble-/)).toHaveCount(0);
     expect(localTarget.requestBodies).toHaveLength(1);
@@ -761,7 +760,6 @@ test.describe("Chat processing recovery @seeded", () => {
     expect(payload.pieces.every((piece) => !piece.applied_converter_ids?.length)).toBe(true);
     expect(retried.messages.messages[0].message_pieces[1].original_value)
       .toBe(originalImage.original_value);
-    await expect(page.getByText(/Converter choices could not be restored/)).toHaveCount(0);
     const historyResponse = await request.get(
       `/api/attacks/${retried.attack.attack_result_id}/messages?conversation_id=${retried.messages.conversation_id}`,
       { headers: compatibilityHeaders() },