fix(lotus): call_state skips standalone mode; dedupe before throttle

startLotusCallState gated only on the URL flag, so a standalone (non-widget)
load built the whole per-member pipeline and stringified it at up to 8 Hz
for a host that doesn't exist. Add the same `if (!widget)` guard the sibling
modules use. Also move distinctUntilChanged ahead of throttleTime so an
unchanged value no longer spends a throttle window (first half of #20).

Fixes #31

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/lotus/lotusCallState.ts

@@ -6,9 +6,15 @@ Please see LICENSE in the repository root for full details.
 */
 
 import { combineLatest, of, type Subscription } from "rxjs";
-import { distinctUntilChanged, map, switchMap, throttleTime } from "rxjs/operators";
+import {
+  distinctUntilChanged,
+  map,
+  switchMap,
+  throttleTime,
+} from "rxjs/operators";
 
 import { type CallViewModel } from "../state/CallViewModel/CallViewModel";
+import { widget } from "../widget";
 import { LotusWidgetActions, lotusFlag, lotusSendToHost } from "./lotusWidget";
 
 interface ParticipantState {
@@ -32,6 +38,10 @@ interface ParticipantState {
  */
 export function startLotusCallState(vm: CallViewModel): () => void {
   if (!lotusFlag("lotusCallState")) return () => undefined;
+  // [lotus] Standalone (non-widget) mode has no host to send state to;
+  // skip building the whole stream pipeline, mirroring lotusFocus.ts /
+  // lotusDecorations.ts.
+  if (!widget) return () => undefined;
 
   const sub: Subscription = vm.userMedia$
     .pipe(
@@ -46,7 +56,11 @@ export function startLotusCallState(vm: CallViewModel): () => void {
                   m.videoEnabled$,
                 ]).pipe(
                   map(
-                    ([speaking, audioEnabled, videoEnabled]): ParticipantState => ({
+                    ([
+                      speaking,
+                      audioEnabled,
+                      videoEnabled,
+                    ]): ParticipantState => ({
                       id: m.id,
                       userId: m.userId,
                       speaking,
@@ -58,11 +72,12 @@ export function startLotusCallState(vm: CallViewModel): () => void {
               ),
             ),
       ),
-      // `speaking` flips rapidly; cap the send rate and drop no-op repeats.
-      // 250ms is plenty for speaking rings / mute badges and keeps the
-      // request/response widget traffic modest.
-      throttleTime(250, undefined, { leading: true, trailing: true }),
+      // `speaking` flips rapidly; drop no-op repeats BEFORE throttling so
+      // the throttle window isn't spent re-emitting an unchanged value, then
+      // cap the send rate. 250ms is plenty for speaking rings / mute badges
+      // and keeps the request/response widget traffic modest.
       distinctUntilChanged((a, b) => JSON.stringify(a) === JSON.stringify(b)),
+      throttleTime(250, undefined, { leading: true, trailing: true }),
     )
     .subscribe((participants) => {
       lotusSendToHost(LotusWidgetActions.CallState, { participants });