feat(pet): cleared alerts stay cleared, contextual bubbles, i18n, moments, chat window

- Fix: an errored session alerted on every update, and Clear alerts only
  dropped it in memory, so its next update (or a reload) brought the alert
  straight back. An error now alerts on the transition into error only;
  cleared sessions are remembered (agenthub.pet.dismissedErrors) and stay
  quiet until they recover and fail anew.
- Quips, greetings, notifications and Ask answers move to i18n (EN/VI);
  Ask understands Vietnamese keywords and names the sessions it counts.
- The pet goes by the worn pet's name; click it in the panel to rename
  (agenthub.pet.names, synced to the account).
- Bubbles name the session they are about, with an Open button (never a
  resume); a burst of the same event coalesces into one count.
- Moments: a new session waves, a finish hops, a subagent peeks, a wait taps,
  an error flinches — on Sagi, Codex sprites and still images. Idle fidgets,
  a once-per-session greeting, a "Needs you" list, an amber waiting dot.
- Pat (heart button, Ask, or stroking the pet) reacts on the pet itself, so
  it shows while the panel or chat is open.
- Panel drops Run Claude / Activity / Sessions / Errored.
- Ask hands off to a chat window (PetChat) on the default AI tool
  (Claude/Codex): transcript as bubbles, follow-ups and CLI menus through an
  off-screen attached terminal; no new server route.

Verified on HEAD + this diff in a clean worktree: tsc -b, the full client
suite (1334/1335; the one failure, ConversationView.follow, is flaky under
load and passes 3/3 alone) and server me-prefs.test.js.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

client/src/components/Sagi/__tests__/Pets.test.tsx

@@ -261,7 +261,7 @@ describe("PetMenu", () => {
     renderMenu();
     fireEvent.click(screen.getByTestId("pet-choose"));
     fireEvent.click(await screen.findByTestId("pet-featured-goku"));
-    await waitFor(() => expect(sagiPrefs.getPet()).toEqual({ id: "cp-goku", kind: "codex" }));
+    await waitFor(() => expect(sagiPrefs.getPet()).toEqual({ id: "cp-goku", kind: "codex", name: "Goku" }));
     expect(api.pets.installFeatured).toHaveBeenCalledWith("goku");
   });
 
@@ -284,7 +284,7 @@ describe("PetMenu", () => {
     });
     fireEvent.change(screen.getByTestId("pet-image-input"), { target: { files: [file] } });
     await waitFor(() =>
-      expect(sagiPrefs.getPet()).toEqual({ id: "p-bbbbbbbbbbbb", kind: "image" })
+      expect(sagiPrefs.getPet()).toEqual({ id: "p-bbbbbbbbbbbb", kind: "image", name: "Dog" })
     );
     expect(api.pets.upload).toHaveBeenCalledWith(file);
   });
@@ -313,11 +313,11 @@ describe("PetSettings", () => {
   it("downloads a featured pet on its first pick, wears an own one, deletes it back to Sagi", async () => {
     render(<PetSettings />);
     fireEvent.click(await screen.findByTestId("pet-card-featured-goku"));
-    await waitFor(() => expect(sagiPrefs.getPet()).toEqual({ id: "cp-goku", kind: "codex" }));
+    await waitFor(() => expect(sagiPrefs.getPet()).toEqual({ id: "cp-goku", kind: "codex", name: "Goku" }));
     expect(api.pets.installFeatured).toHaveBeenCalledWith("goku");
 
     fireEvent.click(screen.getByTestId("pet-card-own-p-aaaaaaaaaaaa"));
-    expect(sagiPrefs.getPet()).toEqual({ id: "p-aaaaaaaaaaaa", kind: "image" });
+    expect(sagiPrefs.getPet()).toEqual({ id: "p-aaaaaaaaaaaa", kind: "image", name: "My cat" });
     fireEvent.click(screen.getByTestId("pet-card-own-p-aaaaaaaaaaaa-delete"));
     answerConfirm(true);
     await waitFor(() => expect(sagiPrefs.getPet()).toEqual({ id: "sagi" }));
@@ -329,7 +329,7 @@ describe("PetSettings", () => {
     const file = new File([new Uint8Array([0x89, 0x50])], "Dog.png", { type: "image/png" });
     fireEvent.change(screen.getByTestId("pet-settings-image-input"), { target: { files: [file] } });
     await waitFor(() =>
-      expect(sagiPrefs.getPet()).toEqual({ id: "p-bbbbbbbbbbbb", kind: "image" })
+      expect(sagiPrefs.getPet()).toEqual({ id: "p-bbbbbbbbbbbb", kind: "image", name: "Dog" })
     );
   });