feat(miner-ui): chat message list, bubble, and typing indicator components

apps/loopover-miner-ui/src/chat-message-components.test.tsx

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+import { render, screen } from "@testing-library/react";
+import { describe, expect, it } from "vitest";
+import { MessageList } from "./components/chat/message-list";
+import { MessageBubble } from "./components/chat/message-bubble";
+import { TypingIndicator } from "./components/chat/typing-indicator";
+import { emptyConversation, multiTurnConversation, singleMessage, type ChatMessage } from "./components/chat/fixtures";
+
+describe("MessageList (#6515) — StateBoundary branches", () => {
+  it("renders one bubble per message in the populated state", () => {
+    render(<MessageList messages={multiTurnConversation} />);
+    expect(screen.getAllByRole("listitem")).toHaveLength(multiTurnConversation.length);
+    expect(screen.getByText(multiTurnConversation[0]!.content)).toBeTruthy();
+  });
+
+  it("shows the empty state (not a bare list) when there are no messages", () => {
+    render(<MessageList messages={emptyConversation} />);
+    expect(screen.getByText(/No messages yet/i)).toBeTruthy();
+    expect(screen.queryAllByRole("listitem")).toHaveLength(0);
+  });
+
+  it("shows the loading state", () => {
+    render(<MessageList messages={emptyConversation} isLoading />);
+    expect(screen.getByText(/Loading conversation/i)).toBeTruthy();
+    expect(screen.queryAllByRole("listitem")).toHaveLength(0);
+  });
+
+  it("shows the error state", () => {
+    render(<MessageList messages={emptyConversation} isError />);
+    expect(screen.getByText(/Couldn't load the conversation/i)).toBeTruthy();
+  });
+
+  it("renders the typing indicator (below the list) when composing, independent of message state", () => {
+    render(<MessageList messages={singleMessage} composing />);
+    expect(screen.getByRole("status", { name: /is typing/i })).toBeTruthy();
+    // still renders the list itself
+    expect(screen.getAllByRole("listitem")).toHaveLength(1);
+  });
+
+  it("does not render the typing indicator when not composing", () => {
+    render(<MessageList messages={singleMessage} />);
+    expect(screen.queryByRole("status", { name: /is typing/i })).toBeNull();
+  });
+});
+
+describe("MessageBubble (#6515) — role-color + avatar branches", () => {
+  const base: ChatMessage = {
+    id: "x",
+    role: "assistant",
+    content: "hello world",
+    timestamp: "2026-07-16T08:00:00.000Z",
+  };
+
+  it("applies a distinct role-colored background per role, from theme tokens only", () => {
+    const roleToClass: Record<ChatMessage["role"], string> = {
+      user: "bg-primary",
+      assistant: "bg-muted",
+      system: "bg-secondary",
+    };
+    for (const [role, cls] of Object.entries(roleToClass) as [ChatMessage["role"], string][]) {
+      const { unmount } = render(<MessageBubble message={{ ...base, role, content: `c-${role}` }} />);
+      expect(screen.getByText(`c-${role}`).className).toContain(cls);
+      unmount();
+    }
+  });
+
+  it("renders the initials fallback from the author name (or role when unnamed)", () => {
+    const { unmount } = render(<MessageBubble message={{ ...base, authorName: "operator" }} />);
+    expect(screen.getByText("OP")).toBeTruthy();
+    unmount();
+    render(<MessageBubble message={base} />); // no authorName → falls back to the role
+    expect(screen.getByText("AS")).toBeTruthy();
+  });
+
+  it("renders no <img> and shows the initials fallback when no avatarUrl is given", () => {
+    const { container } = render(<MessageBubble message={base} />);
+    expect(container.querySelector("img")).toBeNull();
+    expect(screen.getByText("AS")).toBeTruthy();
+  });
+
+  it("accepts an avatarUrl without breaking the fallback path", () => {
+    // Radix AvatarImage mounts the real <img> only after it loads (which never happens in jsdom), so the
+    // initials fallback is the state that renders here — exercising the avatarUrl-present branch safely.
+    render(
+      <MessageBubble message={{ ...base, role: "user", authorName: "operator", avatarUrl: "https://a.test/o.png" }} />,
+    );
+    expect(screen.getByText("OP")).toBeTruthy();
+  });
+
+  it("renders a machine-readable timestamp", () => {
+    render(<MessageBubble message={base} />);
+    const time = document.querySelector("time");
+    expect(time?.getAttribute("dateTime")).toBe(base.timestamp);
+  });
+});
+
+describe("TypingIndicator (#6515) — composing branches + accessible name", () => {
+  it("renders a typing-specific accessible name (not 'loading') when composing", () => {
+    render(<TypingIndicator composing authorName="LoopOver" />);
+    const status = screen.getByRole("status", { name: /LoopOver is typing/i });
+    expect(status).toBeTruthy();
+    expect(status.getAttribute("aria-label")).toMatch(/typing/i);
+    expect(status.getAttribute("aria-label")).not.toMatch(/loading/i);
+  });
+
+  it("renders nothing when not composing", () => {
+    const { container } = render(<TypingIndicator composing={false} />);
+    expect(container.firstChild).toBeNull();
+  });
+});

apps/loopover-miner-ui/src/components/chat/fixtures.ts

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+// Fixture data for the miner-ui chat components (#6515). These components are backend-agnostic — driven
+// entirely by props (a message array + a composing flag); a real data source arrives in a later,
+// separately-scoped issue. The shapes below are exactly what MessageBubble / MessageList render against.
+
+export type ChatRole = "user" | "assistant" | "system";
+
+export interface ChatMessage {
+  id: string;
+  role: ChatRole;
+  content: string;
+  /** ISO-8601 timestamp; MessageBubble renders it through a <time dateTime={…}> element. */
+  timestamp: string;
+  /** Optional display name; falls back to the role for the avatar initials and image alt text. */
+  authorName?: string;
+  /** Optional avatar image URL; when absent, MessageBubble renders the initials fallback only. */
+  avatarUrl?: string;
+}
+
+/** Empty conversation — drives MessageList's StateBoundary empty branch. */
+export const emptyConversation: ChatMessage[] = [];
+
+export const singleMessage: ChatMessage[] = [
+  {
+    id: "m1",
+    role: "assistant",
+    content: "Hi — ask me anything about this miner's queue, runs, or ledgers.",
+    timestamp: "2026-07-16T08:00:00.000Z",
+    authorName: "LoopOver",
+  },
+];
+
+/** A representative multi-turn exchange spanning all three roles, with and without an avatar image. */
+export const multiTurnConversation: ChatMessage[] = [
+  {
+    id: "m1",
+    role: "user",
+    content: "What's stuck in the portfolio queue?",
+    timestamp: "2026-07-16T08:00:10.000Z",
+    authorName: "operator",
+    avatarUrl: "https://avatars.example.test/operator.png",
+  },
+  {
+    id: "m2",
+    role: "assistant",
+    content: "Two items are leased but idle past their TTL. Want me to reclaim them?",
+    timestamp: "2026-07-16T08:00:15.000Z",
+    authorName: "LoopOver",
+  },
+  {
+    id: "m3",
+    role: "user",
+    content: "Yes, reclaim both.",
+    timestamp: "2026-07-16T08:00:20.000Z",
+    authorName: "operator",
+    avatarUrl: "https://avatars.example.test/operator.png",
+  },
+  {
+    id: "m4",
+    role: "system",
+    content: "Reclaimed 2 stuck items back to queued.",
+    timestamp: "2026-07-16T08:00:21.000Z",
+  },
+];
+
+/** A long-content edge case — exercises wrapping/overflow in MessageBubble and MessageList's viewport. */
+export const longContentConversation: ChatMessage[] = [
+  {
+    id: "m1",
+    role: "assistant",
+    content: `Full run breakdown follows. ${"token ".repeat(120)}`.trim(),
+    timestamp: "2026-07-16T08:05:00.000Z",
+    authorName: "LoopOver",
+  },
+];

apps/loopover-miner-ui/src/components/chat/message-bubble.tsx

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+import { Avatar, AvatarFallback, AvatarImage } from "@loopover/ui-kit/components/avatar";
+import type { ChatMessage, ChatRole } from "./fixtures";
+
+// Role-differentiated bubble backgrounds, built ONLY from existing @loopover/ui-kit theme tokens
+// (packages/loopover-ui-kit/src/theme.css) — no new color literals: user = primary, assistant = muted
+// surface, system = secondary.
+const ROLE_BUBBLE_CLASS: Record<ChatRole, string> = {
+  user: "bg-primary text-primary-foreground",
+  assistant: "bg-muted text-foreground",
+  system: "bg-secondary text-secondary-foreground",
+};
+
+function avatarInitials(message: ChatMessage): string {
+  const source = (message.authorName ?? message.role).trim();
+  return (source.slice(0, 2) || message.role.slice(0, 2)).toUpperCase();
+}
+
+function formatTimestamp(iso: string): string {
+  const date = new Date(iso);
+  return Number.isNaN(date.getTime())
+    ? iso
+    : date.toLocaleTimeString(undefined, { hour: "2-digit", minute: "2-digit" });
+}
+
+export function MessageBubble({ message }: { message: ChatMessage }) {
+  const bubbleClass = ROLE_BUBBLE_CLASS[message.role];
+  const displayName = message.authorName ?? message.role;
+  return (
+    <div className="flex gap-3">
+      <Avatar className="size-8 shrink-0">
+        {message.avatarUrl ? <AvatarImage src={message.avatarUrl} alt={displayName} /> : null}
+        <AvatarFallback>{avatarInitials(message)}</AvatarFallback>
+      </Avatar>
+      <div className="flex min-w-0 flex-col gap-1">
+        <div className={`whitespace-pre-wrap break-words rounded-token-sm px-3 py-2 text-token-sm ${bubbleClass}`}>
+          {message.content}
+        </div>
+        <time className="text-token-xs text-muted-foreground" dateTime={message.timestamp}>
+          {formatTimestamp(message.timestamp)}
+        </time>
+      </div>
+    </div>
+  );
+}

apps/loopover-miner-ui/src/components/chat/message-list.tsx

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+import { ScrollArea } from "@loopover/ui-kit/components/scroll-area";
+import { StateBoundary } from "@loopover/ui-kit/components/state-views";
+import { MessageBubble } from "./message-bubble";
+import { TypingIndicator } from "./typing-indicator";
+import type { ChatMessage } from "./fixtures";
+
+// The scrollable message list for the chat rail (#6515). Backend-agnostic: it renders whatever message
+// array it's given, wrapping the content in ui-kit's StateBoundary for its own loading/empty/error states
+// and using ui-kit's ScrollArea (not a raw overflow div) for the viewport. The composing flag surfaces the
+// TypingIndicator below the list regardless of the message-array state.
+export function MessageList({
+  messages,
+  isLoading = false,
+  isError = false,
+  composing = false,
+}: {
+  messages: ChatMessage[];
+  isLoading?: boolean;
+  isError?: boolean;
+  composing?: boolean;
+}) {
+  return (
+    <ScrollArea className="h-full">
+      <StateBoundary
+        isLoading={isLoading}
+        isError={isError}
+        isEmpty={messages.length === 0}
+        loadingTitle="Loading conversation…"
+        emptyTitle="No messages yet"
+        emptyDescription="Start the conversation to see messages here."
+        errorTitle="Couldn't load the conversation"
+        errorDescription="The conversation source did not respond. Retry, or check back once it has recovered."
+      >
+        <ol className="flex flex-col gap-4 p-3">
+          {messages.map((message) => (
+            <li key={message.id}>
+              <MessageBubble message={message} />
+            </li>
+          ))}
+        </ol>
+      </StateBoundary>
+      {composing ? <TypingIndicator composing authorName="Assistant" /> : null}
+    </ScrollArea>
+  );
+}

apps/loopover-miner-ui/src/components/chat/typing-indicator.tsx

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+// A composing / "typing" affordance for the chat (#6515) — deliberately distinct from @loopover/ui-kit's
+// Spinner, which only signals whole-panel LOADING. This is an animated three-dot pulse with a typing-specific
+// accessible name, so assistive tech hears "…is typing", not "loading".
+export function TypingIndicator({
+  composing = true,
+  authorName,
+}: {
+  /** When false, renders nothing — the other side isn't composing. */
+  composing?: boolean;
+  authorName?: string;
+}) {
+  if (!composing) return null;
+  const label = `${authorName ?? "Assistant"} is typing…`;
+  return (
+    <div role="status" aria-live="polite" aria-label={label} className="flex items-center gap-1.5 px-3 py-2">
+      <span className="sr-only">{label}</span>
+      <span
+        aria-hidden="true"
+        className="size-1.5 animate-bounce rounded-full bg-muted-foreground [animation-delay:-0.3s]"
+      />
+      <span
+        aria-hidden="true"
+        className="size-1.5 animate-bounce rounded-full bg-muted-foreground [animation-delay:-0.15s]"
+      />
+      <span aria-hidden="true" className="size-1.5 animate-bounce rounded-full bg-muted-foreground" />
+    </div>
+  );
+}