chore(lotus): 0.25.0-lotus.13

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

embedded/web/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@lotusguild/element-call-embedded",
-  "version": "0.25.0-lotus.10",
+  "version": "0.25.0-lotus.13",
   "files": [
     "README.md",
     "LICENSE-AGPL-3.0",

locales/en/app.json

@@ -104,8 +104,9 @@
     "generic_description": "Submitting debug logs will help us track down the problem.",
     "insufficient_capacity": "Insufficient capacity",
     "insufficient_capacity_description": "The server has reached its maximum capacity and you cannot join the call at this time. Try again later, or contact your server admin if the problem persists.",
-    "livekit_connection_error": "Failed to connect to Livekit server",
-    "livekit_connection_error_description": "An error occurred while connecting to the Livekit server (<1>Reason:</1> <2>{{ reason }}</2>).",
+    "livekit_connection_error": "Couldn’t connect to voice",
+    "livekit_not_allowed_description": "The voice server didn’t let you in. The call may be full, or your access to this room may have changed. Try again in a moment.",
+    "livekit_unreachable_description": "Your device couldn’t reach the voice server. Chat can still work when this happens: voice needs its own live connection, which VPNs, antivirus web protection and some work or school networks block. Try again. If it keeps failing, pause your VPN or antivirus web shield, or try another network such as a phone hotspot.",
     "matrix_rtc_transport_missing": "The server is not configured to work with {{brand}}. Please contact your server admin (Domain: {{domain}}, Error Code: {{ errorCode }}).",
     "membership_manager": "Membership Manager Error",
     "membership_manager_description": "The Membership Manager had to shut down. This is caused by many consecutive failed network requests.",
@@ -119,6 +120,7 @@
     "sfu_token_refused": "Can't join this call",
     "sticky_events_required": "Homeserver does not support Matrix 2.0 calls",
     "sticky_events_required_description": "This deployment is configured to use Matrix 2.0 call mode, but the homeserver does not advertise support for sticky events (MSC4354). Ask your server admin to upgrade, or switch the deployment to a compatible mode.",
+    "try_again": "Try again",
     "unexpected_ec_error": "An unexpected error occurred (<0>Error Code:</0> <1>{{ errorCode }}</1>). Please contact your server admin."
   },
   "group_call_loader": {

src/lotus/lotusActions.test.ts

@@ -26,6 +26,7 @@ describe("LotusWidgetActions", () => {
       LotusWidgetActions.SetQuality,
       LotusWidgetActions.Decorations,
       LotusWidgetActions.SetDeafen,
+      LotusWidgetActions.SetAudioOutput,
     ];
 
     expect(new Set(LOTUS_TO_WIDGET_ACTIONS)).toEqual(new Set(expectedToWidget));

src/lotus/lotusActions.ts

@@ -52,6 +52,16 @@ export enum LotusWidgetActions {
    * disconnect or in-call teardown, whichever comes first.
    */
   CallSummary = "io.lotus.call_summary",
+  /** toWidget: select the audio output device `{ deviceId }` (#119). */
+  SetAudioOutput = "io.lotus.set_audio_output",
+  /** fromWidget: the currently selected output `{ deviceId }` (#119). */
+  AudioOutputState = "io.lotus.audio_output_state",
+  /**
+   * fromWidget: local screenshare reminder `{ kind: "ended" | "no-frames" | "alone" }`
+   * — window closed, no frames for 15 s, or 30 min of sharing with nobody
+   * else in the call (#39). Each fires at most once per share.
+   */
+  ScreenshareNotice = "io.lotus.screenshare_notice",
 }
 
 /** toWidget Lotus actions that must be allow-listed in `initializeWidget`. */
@@ -61,4 +71,5 @@ export const LOTUS_TO_WIDGET_ACTIONS: LotusWidgetActions[] = [
   LotusWidgetActions.SetQuality,
   LotusWidgetActions.Decorations,
   LotusWidgetActions.SetDeafen,
+  LotusWidgetActions.SetAudioOutput,
 ];

src/lotus/lotusAudioOutput.ts

@@ -0,0 +1,46 @@
+/*
+Copyright 2026 Lotus Guild
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import { type IWidgetApiRequest } from "matrix-widget-api";
+import { logger } from "matrix-js-sdk/lib/logger";
+
+import { type MediaDevices } from "../state/MediaDevices";
+import { widget } from "../widget";
+import { LotusWidgetActions } from "./lotusActions";
+import { lotusSendToHost } from "./lotusWidget";
+
+/**
+ * [Gitea #119] Let the host switch the audio output device (headset ↔
+ * speakers) from its own call bar: `io.lotus.set_audio_output { deviceId }`
+ * selects the output; the fork answers each change (and the initial state)
+ * with `io.lotus.audio_output_state { deviceId, available: [{id,label}] }`.
+ * No effect unless the host sends the action. Returns a teardown function.
+ */
+export function startLotusAudioOutput(mediaDevices: MediaDevices): () => void {
+  const w = widget;
+  if (!w) return () => undefined;
+
+  const handler = (ev: CustomEvent<IWidgetApiRequest>): void => {
+    w.api.transport.reply(ev.detail, {});
+    const data = ev.detail.data as { deviceId?: string } | undefined;
+    if (typeof data?.deviceId !== "string") return;
+    logger.debug(`[lotus] set_audio_output: ${data.deviceId}`);
+    mediaDevices.audioOutput.select(data.deviceId);
+  };
+  w.lazyActions.on(LotusWidgetActions.SetAudioOutput, handler);
+
+  const sub = mediaDevices.audioOutput.selected$.subscribe((selected) => {
+    lotusSendToHost(LotusWidgetActions.AudioOutputState, {
+      deviceId: selected?.id ?? null,
+    });
+  });
+
+  return () => {
+    sub.unsubscribe();
+    w.lazyActions.off(LotusWidgetActions.SetAudioOutput, handler);
+  };
+}

src/lotus/lotusScreenshareWatch.test.ts

@@ -0,0 +1,171 @@
+/*
+Copyright 2026 Lotus Guild
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import { RoomEvent, Track } from "livekit-client";
+import { BehaviorSubject } from "rxjs";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { type CallViewModel } from "../state/CallViewModel/CallViewModel";
+import {
+  ALONE_MS,
+  NO_FRAMES_MS,
+  startLotusScreenshareWatch,
+} from "./lotusScreenshareWatch";
+
+const sent: unknown[] = [];
+vi.mock("../widget", () => ({ widget: { api: {} } }));
+vi.mock("./lotusWidget", () => ({
+  lotusSendToHost: (action: string, data: unknown): boolean => {
+    sent.push({ action, data });
+    return true;
+  },
+}));
+
+class FakeTrack extends EventTarget {}
+
+const makeRoom = (): {
+  room: Record<string, unknown>;
+  emit: (event: string, ...args: unknown[]) => void;
+  remote: Map<string, unknown>;
+} => {
+  const handlers = new Map<string, ((...args: unknown[]) => void)[]>();
+  const remote = new Map<string, unknown>();
+  const room = {
+    remoteParticipants: remote,
+    localParticipant: { trackPublications: new Map() },
+    on: (event: string, h: (...args: unknown[]) => void): void => {
+      handlers.set(event, [...(handlers.get(event) ?? []), h]);
+    },
+    off: (event: string, h: (...args: unknown[]) => void): void => {
+      handlers.set(
+        event,
+        (handlers.get(event) ?? []).filter((x) => x !== h),
+      );
+    },
+  };
+  return {
+    room,
+    remote,
+    emit: (event, ...args): void => {
+      (handlers.get(event) ?? []).forEach((h) => h(...args));
+    },
+  };
+};
+
+describe("startLotusScreenshareWatch", () => {
+  let clock = 0;
+  beforeEach(() => {
+    sent.length = 0;
+    clock = 1_000_000;
+    vi.useFakeTimers();
+  });
+  afterEach(() => vi.useRealTimers());
+
+  const start = (): ReturnType<typeof makeRoom> & { stop: () => void } => {
+    const fake = makeRoom();
+    const connections = new BehaviorSubject({
+      getConnections: () => [{ livekitRoom: fake.room }],
+    });
+    const stop = startLotusScreenshareWatch(
+      { allConnections$: connections } as unknown as CallViewModel,
+      () => clock,
+    );
+    return { ...fake, stop };
+  };
+
+  it("reports a share whose track ended", () => {
+    const { emit, stop } = start();
+    const mst = new FakeTrack();
+    emit(RoomEvent.LocalTrackPublished, {
+      source: Track.Source.ScreenShare,
+      track: { mediaStreamTrack: mst },
+    });
+    mst.dispatchEvent(new Event("ended"));
+    expect(sent).toEqual([
+      { action: "io.lotus.screenshare_notice", data: { kind: "ended" } },
+    ]);
+    stop();
+  });
+
+  it("reports no frames after a sustained mute, once, and not after an unmute", () => {
+    const { emit, stop } = start();
+    const mst = new FakeTrack();
+    emit(RoomEvent.LocalTrackPublished, {
+      source: Track.Source.ScreenShare,
+      track: { mediaStreamTrack: mst },
+    });
+    mst.dispatchEvent(new Event("mute"));
+    vi.advanceTimersByTime(NO_FRAMES_MS / 2);
+    mst.dispatchEvent(new Event("unmute"));
+    vi.advanceTimersByTime(NO_FRAMES_MS);
+    expect(sent).toEqual([]);
+    mst.dispatchEvent(new Event("mute"));
+    vi.advanceTimersByTime(NO_FRAMES_MS);
+    mst.dispatchEvent(new Event("mute"));
+    vi.advanceTimersByTime(NO_FRAMES_MS);
+    expect(sent).toEqual([
+      { action: "io.lotus.screenshare_notice", data: { kind: "no-frames" } },
+    ]);
+    stop();
+  });
+
+  it("nudges after 30 min of sharing with nobody else, never while others are present", () => {
+    const { emit, remote, stop } = start();
+    emit(RoomEvent.LocalTrackPublished, {
+      source: Track.Source.ScreenShare,
+      track: { mediaStreamTrack: new FakeTrack() },
+    });
+    remote.set("bob", {});
+    clock += ALONE_MS + 60_000;
+    vi.advanceTimersByTime(60_000);
+    expect(sent).toEqual([]);
+    remote.clear();
+    vi.advanceTimersByTime(60_000);
+    vi.advanceTimersByTime(60_000);
+    expect(sent).toEqual([
+      { action: "io.lotus.screenshare_notice", data: { kind: "alone" } },
+    ]);
+    stop();
+  });
+
+  it("reports ended from the unpublish when LiveKit's handler ran first", () => {
+    const { emit, stop } = start();
+    const share = new FakeTrack() as FakeTrack & { readyState: string };
+    share.readyState = "ended";
+    const pub = {
+      source: Track.Source.ScreenShare,
+      track: { mediaStreamTrack: share },
+    };
+    emit(RoomEvent.LocalTrackPublished, pub);
+    emit(RoomEvent.LocalTrackUnpublished, pub);
+    share.dispatchEvent(new Event("ended"));
+    expect(sent).toEqual([
+      { action: "io.lotus.screenshare_notice", data: { kind: "ended" } },
+    ]);
+    stop();
+  });
+
+  it("ignores non-screenshare publications and stops watching on unpublish", () => {
+    const { emit, stop } = start();
+    const cam = new FakeTrack();
+    emit(RoomEvent.LocalTrackPublished, {
+      source: Track.Source.Camera,
+      track: { mediaStreamTrack: cam },
+    });
+    cam.dispatchEvent(new Event("ended"));
+    const share = new FakeTrack();
+    const pub = {
+      source: Track.Source.ScreenShare,
+      track: { mediaStreamTrack: share },
+    };
+    emit(RoomEvent.LocalTrackPublished, pub);
+    emit(RoomEvent.LocalTrackUnpublished, pub);
+    share.dispatchEvent(new Event("ended"));
+    expect(sent).toEqual([]);
+    stop();
+  });
+});

src/lotus/lotusScreenshareWatch.ts

@@ -0,0 +1,136 @@
+/*
+Copyright 2026 Lotus Guild
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import {
+  type LocalTrackPublication,
+  type Room as LivekitRoom,
+  RoomEvent,
+  Track,
+} from "livekit-client";
+
+import { type CallViewModel } from "../state/CallViewModel/CallViewModel";
+import { widget } from "../widget";
+import { LotusWidgetActions } from "./lotusActions";
+import { lotusSendToHost } from "./lotusWidget";
+
+export type ScreenshareNoticeKind = "ended" | "no-frames" | "alone";
+
+/** A shared window minimised/occluded this long with no frames → tell the host. */
+export const NO_FRAMES_MS = 15_000;
+/** Sharing this long with nobody else in the call → one "still sharing?" nudge. */
+export const ALONE_MS = 30 * 60_000;
+const ALONE_CHECK_MS = 60_000;
+
+/**
+ * [lotus #39] Watch the local screenshare and tell the host about the two
+ * cases people miss: the share went black/ended (window closed or minimised)
+ * and a long share with nobody else in the call. Detection only — the host
+ * renders the notices. Each notice fires at most once per share.
+ */
+export function startLotusScreenshareWatch(
+  vm: CallViewModel,
+  now: () => number = () => Date.now(),
+): () => void {
+  if (!widget) return () => undefined;
+
+  const notify = (kind: ScreenshareNoticeKind): void => {
+    lotusSendToHost(LotusWidgetActions.ScreenshareNotice, { kind });
+  };
+
+  const perRoom = new Map<LivekitRoom, () => void>();
+
+  const attach = (room: LivekitRoom): void => {
+    let cleanupTrack: (() => void) | undefined;
+    let endedHook: (() => void) | undefined;
+
+    const watchPublication = (pub: LocalTrackPublication): void => {
+      if (pub.source !== Track.Source.ScreenShare) return;
+      cleanupTrack?.();
+      const mst = pub.track?.mediaStreamTrack;
+      const startedAt = now();
+      let noFramesTimer: ReturnType<typeof setTimeout> | undefined;
+      let sentNoFrames = false;
+      let sentAlone = false;
+
+      let sentEnded = false;
+      const onEnded = (): void => {
+        if (sentEnded) return;
+        sentEnded = true;
+        notify("ended");
+      };
+      const onMute = (): void => {
+        if (sentNoFrames) return;
+        noFramesTimer = setTimeout(() => {
+          sentNoFrames = true;
+          notify("no-frames");
+        }, NO_FRAMES_MS);
+      };
+      const onUnmute = (): void => {
+        if (noFramesTimer !== undefined) clearTimeout(noFramesTimer);
+        noFramesTimer = undefined;
+      };
+      endedHook = onEnded;
+      mst?.addEventListener("ended", onEnded);
+      mst?.addEventListener("mute", onMute);
+      mst?.addEventListener("unmute", onUnmute);
+
+      const aloneTimer = setInterval(() => {
+        if (sentAlone) return;
+        if (room.remoteParticipants.size > 0) return;
+        if (now() - startedAt < ALONE_MS) return;
+        sentAlone = true;
+        notify("alone");
+      }, ALONE_CHECK_MS);
+
+      cleanupTrack = (): void => {
+        mst?.removeEventListener("ended", onEnded);
+        mst?.removeEventListener("mute", onMute);
+        mst?.removeEventListener("unmute", onUnmute);
+        if (noFramesTimer !== undefined) clearTimeout(noFramesTimer);
+        clearInterval(aloneTimer);
+        cleanupTrack = undefined;
+        endedHook = undefined;
+      };
+    };
+
+    // LiveKit's own `ended` handler runs first and unpublishes the share; a
+    // listener removed during that dispatch never fires, so decide from the
+    // track's state here as well.
+    const onUnpublished = (pub: LocalTrackPublication): void => {
+      if (pub.source !== Track.Source.ScreenShare) return;
+      if (pub.track?.mediaStreamTrack?.readyState === "ended") endedHook?.();
+      cleanupTrack?.();
+    };
+
+    room.on(RoomEvent.LocalTrackPublished, watchPublication);
+    room.on(RoomEvent.LocalTrackUnpublished, onUnpublished);
+    room.localParticipant.trackPublications.forEach(watchPublication);
+
+    perRoom.set(room, () => {
+      cleanupTrack?.();
+      room.off(RoomEvent.LocalTrackPublished, watchPublication);
+      room.off(RoomEvent.LocalTrackUnpublished, onUnpublished);
+    });
+  };
+
+  const sub = vm.allConnections$.subscribe((data) => {
+    const rooms = data.getConnections().map((c) => c.livekitRoom);
+    for (const [room, off] of perRoom) {
+      if (!rooms.includes(room)) {
+        off();
+        perRoom.delete(room);
+      }
+    }
+    for (const room of rooms) if (!perRoom.has(room)) attach(room);
+  });
+
+  return () => {
+    sub.unsubscribe();
+    for (const off of perRoom.values()) off();
+    perRoom.clear();
+  };
+}

src/room/GroupCallErrorBoundary.test.tsx

@@ -365,17 +365,18 @@ describe("LiveKit ConnectionError variants", () => {
       expectedReason: "InternalError",
     },
   ])(
-    "should display LiveKit $name error correctly",
+    "should explain the LiveKit $name error and offer a retry",
     async ({ error, expectedReason }) => {
       const TestComponent = (): ReactNode => {
         throw new LivekitConnectionError(error);
       };
+      const recoveryActionHandler = vi.fn(async () => Promise.resolve());
 
       const { asFragment } = render(
         <BrowserRouter>
           <GroupCallErrorBoundary
             onError={vi.fn()}
-            recoveryActionHandler={vi.fn()}
+            recoveryActionHandler={recoveryActionHandler}
             widget={null}
           >
             <TestComponent />
@@ -383,12 +384,28 @@ describe("LiveKit ConnectionError variants", () => {
         </BrowserRouter>,
       );
 
-      // Check title
-      await screen.findByText("Failed to connect to Livekit server");
+      await screen.findByText("Couldn’t connect to voice");
 
-      // Check that reason is displayed in the description
-      expect(screen.getByText(/Reason:/i)).toBeInTheDocument();
-      expect(screen.getByText(expectedReason)).toBeInTheDocument();
+      // [lotus] Plain-language guidance instead of "(Reason: X)".
+      expect(
+        screen.getByText(
+          expectedReason === "NotAllowed"
+            ? /The voice server didn’t let you in/
+            : /Your device couldn’t reach the voice server/,
+        ),
+      ).toBeInTheDocument();
+
+      // The raw reason is still there, under Technical details.
+      expect(screen.getByText("Technical details")).toBeInTheDocument();
+      expect(
+        screen.getByText(new RegExp(`Reason: ${expectedReason}`), {
+          selector: "pre",
+        }),
+      ).toBeInTheDocument();
+
+      // Try again re-enters the call.
+      await userEvent.click(screen.getByRole("button", { name: "Try again" }));
+      expect(recoveryActionHandler).toHaveBeenCalledWith("reconnect");
 
       expect(asFragment()).toMatchSnapshot();
     },

src/room/GroupCallErrorBoundary.tsx

@@ -30,6 +30,8 @@ import {
   ElementCallError,
   ErrorCategory,
   ErrorCode,
+  LivekitConnectionError,
+  PeerConnectionTimeoutError,
   UnknownCallError,
 } from "../utils/errors.ts";
 import { FullScreenView } from "../FullScreenView.tsx";
@@ -78,10 +80,22 @@ const ErrorPage: FC<ErrorPageProps> = ({
       label: t("call_ended_view.reconnect_button"),
       onClick: () => void recoveryActionHandler("reconnect"),
     });
+  } else if (
+    // [lotus] A failed connect is often transient (busy server, flaky Wi-Fi);
+    // offer the same re-enter path instead of a dead end.
+    error instanceof LivekitConnectionError ||
+    error instanceof PeerConnectionTimeoutError
+  ) {
+    actions.push({
+      label: t("error.try_again"),
+      onClick: () => void recoveryActionHandler("reconnect"),
+    });
   }
 
   const technicalError =
-    error.cause instanceof MatrixError ? error.cause : null;
+    error.cause instanceof MatrixError
+      ? error.cause.message
+      : (error.technicalDetails ?? null);
 
   return (
     <FullScreenView>
@@ -124,15 +138,15 @@ const ErrorPage: FC<ErrorPageProps> = ({
             <summary className={styles.technicalDetailsSummary}>
               {t("technical_details")}
             </summary>
-            <pre className={styles.technicalDetailsPre}>
-              {technicalError.message}
-            </pre>
+            <pre className={styles.technicalDetailsPre}>{technicalError}</pre>
           </details>
         ) : null}
         {actions &&
           actions.map((action, index) => (
             <Button
-              kind="secondary"
+              // [lotus] primary: the Lotus theme renders `secondary` as dark
+              // text on a dark fill, and this is the action we want taken.
+              kind="primary"
               onClick={action.onClick}
               key={`action${index}`}
             >

src/room/InCallView.tsx

@@ -36,6 +36,8 @@ import { startLotusQuality } from "../lotus/lotusQuality";
 import { startLotusDecorations } from "../lotus/lotusDecorations";
 import { startLotusDenoise } from "../lotus/lotusDenoise";
 import { startLotusCallSummary } from "../lotus/lotusCallSummary";
+import { startLotusAudioOutput } from "../lotus/lotusAudioOutput";
+import { startLotusScreenshareWatch } from "../lotus/lotusScreenshareWatch";
 import { startLotusDeafen } from "../lotus/lotusDeafen";
 import styles from "./InCallView.module.css";
 import { GridTile } from "../tile/GridTile";
@@ -311,10 +313,18 @@ export const InCallView: FC<InCallViewProps> = ({
   // survives reconnects (#1 / A7). No-op unless lotusDenoiseSource=1.
   useEffect(() => startLotusDenoise(vm), [vm]);
   useEffect(() => startLotusCallSummary(vm), [vm]);
+  // [lotus #39] Screenshare reminders (window closed / black / sharing alone).
+  useEffect(() => startLotusScreenshareWatch(vm), [vm]);
   // [lotus] Handle the host's io.lotus.set_deafen action to silence remote
   // audio (and optionally screenshare audio) at the LiveKit source. No-op
   // unless the host sends the action.
   useEffect(() => startLotusDeafen(), []);
+  // [lotus #119] Let the host pick the audio output device from its call bar.
+  const lotusMediaDevices = useMediaDevices();
+  useEffect(
+    () => startLotusAudioOutput(lotusMediaDevices),
+    [lotusMediaDevices],
+  );
 
   const fatalCallError = useBehavior(vm.fatalError$);
   // Stop the rendering and throw for the error boundary

src/room/__snapshots__/GroupCallErrorBoundary.test.tsx.snap

@@ -135,7 +135,7 @@ exports[`ConnectionLostError: Action handling should reset error state 1`] = `
           </p>
           <button
             class="_button_1nw83_8"
-            data-kind="secondary"
+            data-kind="primary"
             data-size="lg"
             role="button"
             tabindex="0"
@@ -158,7 +158,7 @@ exports[`ConnectionLostError: Action handling should reset error state 1`] = `
 </DocumentFragment>
 `;
 
-exports[`LiveKit ConnectionError variants > should display LiveKit 'internal' error correctly 1`] = `
+exports[`LiveKit ConnectionError variants > should explain the LiveKit 'internal' error and offer a retry 1`] = `
 <DocumentFragment>
   <div
     class="_page_4be5c0"
@@ -286,19 +286,35 @@ exports[`LiveKit ConnectionError variants > should display LiveKit 'internal' er
           <h1
             class="_typography_6v6n8_153 _font-heading-md-semibold_6v6n8_112"
           >
-            Failed to connect to Livekit server
+            Couldn’t connect to voice
           </h1>
           <p>
-            An error occurred while connecting to the Livekit server (
-            <b>
-              Reason:
-            </b>
-             
-            <code>
-              InternalError
-            </code>
-            ).
+            Your device couldn’t reach the voice server. Chat can still work when this happens: voice needs its own live connection, which VPNs, antivirus web protection and some work or school networks block. Try again. If it keeps failing, pause your VPN or antivirus web shield, or try another network such as a phone hotspot.
           </p>
+          <details
+            class="_technicalDetails_a69dc5"
+          >
+            <summary
+              class="_technicalDetailsSummary_a69dc5"
+            >
+              Technical details
+            </summary>
+            <pre
+              class="_technicalDetailsPre_a69dc5"
+            >
+              Reason: InternalError
+Internal server error
+            </pre>
+          </details>
+          <button
+            class="_button_1nw83_8"
+            data-kind="primary"
+            data-size="lg"
+            role="button"
+            tabindex="0"
+          >
+            Try again
+          </button>
           <button
             class="_button_1nw83_8"
             data-kind="tertiary"
@@ -315,7 +331,7 @@ exports[`LiveKit ConnectionError variants > should display LiveKit 'internal' er
 </DocumentFragment>
 `;
 
-exports[`LiveKit ConnectionError variants > should display LiveKit 'notAllowed' error correctly 1`] = `
+exports[`LiveKit ConnectionError variants > should explain the LiveKit 'notAllowed' error and offer a retry 1`] = `
 <DocumentFragment>
   <div
     class="_page_4be5c0"
@@ -443,19 +459,36 @@ exports[`LiveKit ConnectionError variants > should display LiveKit 'notAllowed'
           <h1
             class="_typography_6v6n8_153 _font-heading-md-semibold_6v6n8_112"
           >
-            Failed to connect to Livekit server
+            Couldn’t connect to voice
           </h1>
           <p>
-            An error occurred while connecting to the Livekit server (
-            <b>
-              Reason:
-            </b>
-             
-            <code>
-              NotAllowed
-            </code>
-            ).
+            The voice server didn’t let you in. The call may be full, or your access to this room may have changed. Try again in a moment.
           </p>
+          <details
+            class="_technicalDetails_a69dc5"
+          >
+            <summary
+              class="_technicalDetailsSummary_a69dc5"
+            >
+              Technical details
+            </summary>
+            <pre
+              class="_technicalDetailsPre_a69dc5"
+            >
+              Reason: NotAllowed
+Status: 403
+Permission denied by server
+            </pre>
+          </details>
+          <button
+            class="_button_1nw83_8"
+            data-kind="primary"
+            data-size="lg"
+            role="button"
+            tabindex="0"
+          >
+            Try again
+          </button>
           <button
             class="_button_1nw83_8"
             data-kind="tertiary"
@@ -472,7 +505,7 @@ exports[`LiveKit ConnectionError variants > should display LiveKit 'notAllowed'
 </DocumentFragment>
 `;
 
-exports[`LiveKit ConnectionError variants > should display LiveKit 'serverUnreachable' error correctly 1`] = `
+exports[`LiveKit ConnectionError variants > should explain the LiveKit 'serverUnreachable' error and offer a retry 1`] = `
 <DocumentFragment>
   <div
     class="_page_4be5c0"
@@ -600,19 +633,36 @@ exports[`LiveKit ConnectionError variants > should display LiveKit 'serverUnreac
           <h1
             class="_typography_6v6n8_153 _font-heading-md-semibold_6v6n8_112"
           >
-            Failed to connect to Livekit server
+            Couldn’t connect to voice
           </h1>
           <p>
-            An error occurred while connecting to the Livekit server (
-            <b>
-              Reason:
-            </b>
-             
-            <code>
-              ServerUnreachable
-            </code>
-            ).
+            Your device couldn’t reach the voice server. Chat can still work when this happens: voice needs its own live connection, which VPNs, antivirus web protection and some work or school networks block. Try again. If it keeps failing, pause your VPN or antivirus web shield, or try another network such as a phone hotspot.
           </p>
+          <details
+            class="_technicalDetails_a69dc5"
+          >
+            <summary
+              class="_technicalDetailsSummary_a69dc5"
+            >
+              Technical details
+            </summary>
+            <pre
+              class="_technicalDetailsPre_a69dc5"
+            >
+              Reason: ServerUnreachable
+Status: 503
+Server is unreachable
+            </pre>
+          </details>
+          <button
+            class="_button_1nw83_8"
+            data-kind="primary"
+            data-size="lg"
+            role="button"
+            tabindex="0"
+          >
+            Try again
+          </button>
           <button
             class="_button_1nw83_8"
             data-kind="tertiary"
@@ -629,7 +679,7 @@ exports[`LiveKit ConnectionError variants > should display LiveKit 'serverUnreac
 </DocumentFragment>
 `;
 
-exports[`LiveKit ConnectionError variants > should display LiveKit 'serviceNotFound' error correctly 1`] = `
+exports[`LiveKit ConnectionError variants > should explain the LiveKit 'serviceNotFound' error and offer a retry 1`] = `
 <DocumentFragment>
   <div
     class="_page_4be5c0"
@@ -757,19 +807,35 @@ exports[`LiveKit ConnectionError variants > should display LiveKit 'serviceNotFo
           <h1
             class="_typography_6v6n8_153 _font-heading-md-semibold_6v6n8_112"
           >
-            Failed to connect to Livekit server
+            Couldn’t connect to voice
           </h1>
           <p>
-            An error occurred while connecting to the Livekit server (
-            <b>
-              Reason:
-            </b>
-             
-            <code>
-              ServiceNotFound
-            </code>
-            ).
+            Your device couldn’t reach the voice server. Chat can still work when this happens: voice needs its own live connection, which VPNs, antivirus web protection and some work or school networks block. Try again. If it keeps failing, pause your VPN or antivirus web shield, or try another network such as a phone hotspot.
           </p>
+          <details
+            class="_technicalDetails_a69dc5"
+          >
+            <summary
+              class="_technicalDetailsSummary_a69dc5"
+            >
+              Technical details
+            </summary>
+            <pre
+              class="_technicalDetailsPre_a69dc5"
+            >
+              Reason: ServiceNotFound
+RTC service not found
+            </pre>
+          </details>
+          <button
+            class="_button_1nw83_8"
+            data-kind="primary"
+            data-size="lg"
+            role="button"
+            tabindex="0"
+          >
+            Try again
+          </button>
           <button
             class="_button_1nw83_8"
             data-kind="tertiary"
@@ -786,7 +852,7 @@ exports[`LiveKit ConnectionError variants > should display LiveKit 'serviceNotFo
 </DocumentFragment>
 `;
 
-exports[`LiveKit ConnectionError variants > should display LiveKit 'timeout' error correctly 1`] = `
+exports[`LiveKit ConnectionError variants > should explain the LiveKit 'timeout' error and offer a retry 1`] = `
 <DocumentFragment>
   <div
     class="_page_4be5c0"
@@ -914,19 +980,35 @@ exports[`LiveKit ConnectionError variants > should display LiveKit 'timeout' err
           <h1
             class="_typography_6v6n8_153 _font-heading-md-semibold_6v6n8_112"
           >
-            Failed to connect to Livekit server
+            Couldn’t connect to voice
           </h1>
           <p>
-            An error occurred while connecting to the Livekit server (
-            <b>
-              Reason:
-            </b>
-             
-            <code>
-              Timeout
-            </code>
-            ).
+            Your device couldn’t reach the voice server. Chat can still work when this happens: voice needs its own live connection, which VPNs, antivirus web protection and some work or school networks block. Try again. If it keeps failing, pause your VPN or antivirus web shield, or try another network such as a phone hotspot.
           </p>
+          <details
+            class="_technicalDetails_a69dc5"
+          >
+            <summary
+              class="_technicalDetailsSummary_a69dc5"
+            >
+              Technical details
+            </summary>
+            <pre
+              class="_technicalDetailsPre_a69dc5"
+            >
+              Reason: Timeout
+Connection timed out
+            </pre>
+          </details>
+          <button
+            class="_button_1nw83_8"
+            data-kind="primary"
+            data-size="lg"
+            role="button"
+            tabindex="0"
+          >
+            Try again
+          </button>
           <button
             class="_button_1nw83_8"
             data-kind="tertiary"
@@ -1084,6 +1166,15 @@ exports[`LiveKit ConnectionError variants > should link to troubleshoot guide wh
             </a>
              or contact your server administrator.
           </p>
+          <button
+            class="_button_1nw83_8"
+            data-kind="primary"
+            data-size="lg"
+            role="button"
+            tabindex="0"
+          >
+            Try again
+          </button>
           <button
             class="_button_1nw83_8"
             data-kind="tertiary"
@@ -1697,7 +1788,7 @@ exports[`should report correct error for 'Connection lost' 1`] = `
           </p>
           <button
             class="_button_1nw83_8"
-            data-kind="secondary"
+            data-kind="primary"
             data-size="lg"
             role="button"
             tabindex="0"

src/state/media/RemoteScreenShareViewModel.ts

@@ -7,7 +7,7 @@ Please see LICENSE in the repository root for full details.
 */
 
 import { Track, type RemoteParticipant } from "livekit-client";
-import { map, of, switchMap } from "rxjs";
+import { distinctUntilChanged, map, of, switchMap } from "rxjs";
 
 import { type Behavior } from "../Behavior";
 import {
@@ -17,7 +17,7 @@ import {
 } from "./ScreenShareViewModel";
 import { type ObservableScope } from "../ObservableScope";
 import { createVolumeControls, type VolumeControls } from "../VolumeControls";
-import { observeTrackReference$ } from "../observeTrackReference";
+import { observeParticipantMedia } from "@livekit/components-core";
 
 export interface RemoteScreenShareViewModel
   extends BaseScreenShareViewModel, VolumeControls {
@@ -58,14 +58,24 @@ export function createRemoteScreenShare(
     videoEnabled$: scope.behavior(
       pretendToBeDisconnected$.pipe(map((disconnected) => !disconnected)),
     ),
+    // [lotus #38] "Has audio" means the sharer publishes screenshare audio AND
+    // hasn't muted it — a muted publication would show a speaker glyph for a
+    // share nobody can hear.
     audioEnabled$: scope.behavior(
       inputs.participant$.pipe(
         switchMap((p) =>
           p
-            ? observeTrackReference$(p, Track.Source.ScreenShareAudio)
-            : of(null),
+            ? observeParticipantMedia(p).pipe(
+                map(() => {
+                  const pub = p.getTrackPublication(
+                    Track.Source.ScreenShareAudio,
+                  );
+                  return !!pub && !pub.isMuted;
+                }),
+              )
+            : of(false),
         ),
-        map(Boolean),
+        distinctUntilChanged(),
       ),
     ),
   };

src/tile/SpotlightTile.tsx

@@ -43,6 +43,7 @@ import { useReactiveState } from "../useReactiveState";
 import { useLatest } from "../useLatest";
 import { type SpotlightTileViewModel } from "../state/TileViewModel";
 import { useBehavior } from "../useBehavior";
+import { muteScreenshareAudio$ } from "../lotus/lotusScreenshareAudio";
 import { type MemberMediaViewModel } from "../state/media/MemberMediaViewModel";
 import { type LocalUserMediaViewModel } from "../state/media/LocalUserMediaViewModel";
 import { type RemoteUserMediaViewModel } from "../state/media/RemoteUserMediaViewModel";
@@ -322,11 +323,13 @@ const ScreenShareVolumeButton: FC<ScreenShareVolumeButtonProps> = ({ vm }) => {
   const audioEnabled = useBehavior(vm.audioEnabled$);
   const playbackMuted = useBehavior(vm.playbackMuted$);
   const playbackVolume = useBehavior(vm.playbackVolume$);
+  // [lotus #38] The host's screenshare-audio mute (io.lotus.set_deafen) mutes
+  // at the renderer, not through the volume controls; show it as muted too.
+  const lotusMuted = useBehavior(muteScreenshareAudio$);
+  const shownMuted = playbackMuted || lotusMuted;
 
-  const VolumeIcon = playbackMuted ? VolumeOffIcon : VolumeOnIcon;
-  const VolumeSolidIcon = playbackMuted
-    ? VolumeOffSolidIcon
-    : VolumeOnSolidIcon;
+  const VolumeIcon = shownMuted ? VolumeOffIcon : VolumeOnIcon;
+  const VolumeSolidIcon = shownMuted ? VolumeOffSolidIcon : VolumeOnSolidIcon;
 
   const [volumeMenuOpen, setVolumeMenuOpen] = useState(false);
   const onMuteButtonClick = useCallback(() => vm.togglePlaybackMuted(), [vm]);

src/utils/errors.ts

@@ -6,7 +6,7 @@ Please see LICENSE in the repository root for full details.
 */
 
 import { t } from "i18next";
-import { type ConnectionError } from "livekit-client";
+import { type ConnectionError, ConnectionErrorReason } from "livekit-client";
 
 import { i18nKey } from "./i18n";
 
@@ -53,6 +53,9 @@ export class ElementCallError extends Error {
   public localisedMessageKey?: string;
   public localisedMessageValues?: Record<string, string>;
 
+  /** [lotus] Raw detail shown under a collapsed "Technical details", not in the message. */
+  public technicalDetails?: string;
+
   protected constructor(
     localisedTitle: string,
     code: ErrorCode,
@@ -307,9 +310,21 @@ export class LivekitConnectionError extends ElementCallError {
       ErrorCode.SFU_ERROR,
       ErrorCategory.NETWORK_CONNECTIVITY,
     );
-    this.localisedMessageKey = i18nKey(
-      "error.livekit_connection_error_description",
-    );
+    // [lotus] "An error occurred while connecting to the Livekit server
+    // (Reason: ServerUnreachable)" left people with nothing to try (Gitea
+    // element-call: a friend retried for ages while Element worked). Say what
+    // it means and what to do; keep the raw reason under Technical details.
+    this.localisedMessageKey =
+      cause.reason === ConnectionErrorReason.NotAllowed
+        ? i18nKey("error.livekit_not_allowed_description")
+        : i18nKey("error.livekit_unreachable_description");
     this.localisedMessageValues = { reason: cause.reasonName };
+    this.technicalDetails = [
+      `Reason: ${cause.reasonName}`,
+      cause.status ? `Status: ${cause.status}` : null,
+      cause.message,
+    ]
+      .filter(Boolean)
+      .join("\n");
   }
 }