test(23-00): Wave 0 test stubs for Phase 23 components and hooks

- ChatSpecCard.test.tsx — 9 it.todo() entries covering spec card behaviors
- ChatHandoffIndicator.test.tsx — 3 it.todo() entries
- ChatTaskCreatedBadge.test.tsx — 4 it.todo() entries
- ChatStatusUpdateBadge.test.tsx — 3 it.todo() entries
- useBrainstormerDefault.test.ts — 4 it.todo() entries
- All 23 todo tests found and skipped by vitest (0 failures)

ui/src/components/ChatHandoffIndicator.test.tsx

@@ -0,0 +1,8 @@
+// @vitest-environment jsdom
+import { describe, it } from "vitest";
+
+describe("ChatHandoffIndicator", () => {
+  it.todo("renders content text between two hr elements");
+  it.todo("has aria-label for agent handoff");
+  it.todo("hr elements have aria-hidden=true");
+});

ui/src/components/ChatSpecCard.test.tsx

@@ -0,0 +1,14 @@
+// @vitest-environment jsdom
+import { describe, it } from "vitest";
+
+describe("ChatSpecCard", () => {
+  it.todo("renders four spec sections: What, Why, Constraints, Success");
+  it.todo("parses JSON content and displays field values");
+  it.todo("shows error fallback on JSON parse failure");
+  it.todo("Send to PM button calls onHandoff with spec content");
+  it.todo("Edit button switches to textarea edit mode");
+  it.todo("Save changes button disabled when all fields empty");
+  it.todo("Discard button reverts to read-only mode");
+  it.todo("Save as Draft button adds [Draft] badge");
+  it.todo("renders with role=region and aria-label=Specification");
+});

ui/src/components/ChatStatusUpdateBadge.test.tsx

@@ -0,0 +1,8 @@
+// @vitest-environment jsdom
+import { describe, it } from "vitest";
+
+describe("ChatStatusUpdateBadge", () => {
+  it.todo("renders CheckCircle2 icon, agent name, and task reference");
+  it.todo("View task link navigates to issue detail");
+  it.todo("has role=status on container");
+});

ui/src/components/ChatTaskCreatedBadge.test.tsx

@@ -0,0 +1,9 @@
+// @vitest-environment jsdom
+import { describe, it } from "vitest";
+
+describe("ChatTaskCreatedBadge", () => {
+  it.todo("shows Creating task... when taskId is not provided");
+  it.todo("renders taskId, taskTitle, and View task link when resolved");
+  it.todo("View task link has correct aria-label");
+  it.todo("has role=status on container");
+});

ui/src/hooks/useBrainstormerDefault.test.ts

@@ -0,0 +1,9 @@
+// @vitest-environment jsdom
+import { describe, it } from "vitest";
+
+describe("useBrainstormerDefault", () => {
+  it.todo("returns general role agent ID when available");
+  it.todo("returns first by createdAt when multiple general agents exist");
+  it.todo("returns null when no agents loaded");
+  it.todo("returns null when no general agent exists");
+});