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__/Sagi.test.tsx

@@ -88,6 +88,89 @@ describe("Sagi widget", () => {
     expect(within(btn).getByText("1")).toBeInTheDocument();
   });
 
+  it("names the errored session in its bubble and in the panel", () => {
+    renderSagi();
+    act(() => {
+      eventBus.publish({
+        type: "session_updated",
+        data: { id: "a", status: "error", name: "Fix login", cwd: "/w/app", lane_id: 3 } as Session,
+        timestamp: "t",
+      });
+    });
+    const bubble = screen.getByRole("status");
+    expect(within(bubble).getByText("Fix login")).toBeInTheDocument();
+    expect(within(bubble).getByRole("button", { name: "Open" })).toBeInTheDocument();
+    fireEvent.click(screen.getByRole("button", { name: /open sagi companion/i }));
+    const panel = screen.getByRole("dialog", { name: /sagi companion/i });
+    expect(within(panel).getByText("Needs you")).toBeInTheDocument();
+    expect(within(panel).getByRole("button", { name: /Fix login/ })).toBeInTheDocument();
+  });
+
+  it("stays quiet about a cleared error when that session updates again", () => {
+    renderSagi();
+    act(() => {
+      eventBus.publish(sessionMsg("a", "error"));
+    });
+    fireEvent.click(screen.getByRole("button", { name: /open sagi companion/i }));
+    fireEvent.click(screen.getByRole("button", { name: "Clear alerts" }));
+    act(() => {
+      eventBus.publish(sessionMsg("a", "error"));
+    });
+    const btn = screen.getByRole("button", { name: /close sagi/i, expanded: true });
+    expect(within(btn).queryByText("1")).not.toBeInTheDocument();
+    expect(JSON.parse(localStorage.getItem("agenthub.pet.dismissedErrors")!)).toEqual(["a"]);
+  });
+
+  it("renames the pet from the panel header", () => {
+    renderSagi();
+    fireEvent.click(screen.getByRole("button", { name: /open sagi companion/i }));
+    fireEvent.click(screen.getByRole("button", { name: /rename sagi/i }));
+    const input = screen.getByLabelText("Pet name");
+    fireEvent.change(input, { target: { value: "Mochi" } });
+    fireEvent.keyDown(input, { key: "Enter" });
+    expect(screen.getByRole("dialog", { name: /mochi companion/i })).toBeInTheDocument();
+    expect(screen.getByLabelText(/ask mochi/i)).toBeInTheDocument();
+  });
+
+  it("hands a question it cannot answer to the chat window", () => {
+    localStorage.setItem("agenthub.defaultTool", "claude");
+    renderSagi();
+    fireEvent.click(screen.getByRole("button", { name: /open sagi companion/i }));
+    const input = screen.getByLabelText(/ask sagi/i);
+    fireEvent.change(input, { target: { value: "write me a haiku" } });
+    fireEvent.submit(input.closest("form")!);
+    const chat = screen.getByRole("dialog", { name: /chat with sagi/i });
+    expect(within(chat).getByText("write me a haiku")).toBeInTheDocument();
+    expect(screen.queryByRole("dialog", { name: /sagi companion/i })).not.toBeInTheDocument();
+  });
+
+  it("opens the chat from the panel and goes back to it", () => {
+    renderSagi();
+    fireEvent.click(screen.getByRole("button", { name: /open sagi companion/i }));
+    fireEvent.click(screen.getByRole("button", { name: /chat with sagi/i }));
+    expect(screen.getByRole("dialog", { name: /chat with sagi/i })).toBeInTheDocument();
+    fireEvent.click(screen.getByRole("button", { name: "Back" }));
+    expect(screen.getByRole("dialog", { name: /sagi companion/i })).toBeInTheDocument();
+  });
+
+  it("a pat shows its reaction on the pet even while the panel is open", () => {
+    renderSagi();
+    fireEvent.click(screen.getByRole("button", { name: /open sagi companion/i }));
+    fireEvent.click(screen.getByRole("button", { name: /pat sagi/i }));
+    const pet = screen.getByRole("button", { name: /close sagi/i, expanded: true });
+    expect(pet.querySelector(".sagi-reaction-text")?.textContent).toBeTruthy();
+  });
+
+  it("stroking the pet back and forth pats it", () => {
+    renderSagi();
+    const pet = screen.getByRole("button", { name: /open sagi companion/i });
+    const xs = [100, 130, 100, 130, 100, 130, 100];
+    act(() => {
+      for (const x of xs) fireEvent.pointerMove(pet, { clientX: x, clientY: 50, buttons: 0 });
+    });
+    expect(pet.querySelector(".sagi-reaction-text")).not.toBeNull();
+  });
+
   it("reflects the live count in the panel status", () => {
     renderSagi();
     act(() => {