feat(calls): "Call ended · 41 min · connection was good" toast (#143)

One line in the existing toast style when a call you were in ends: the
duration from our own join clock, plus the fork's io.lotus.call_summary
readout (fork ≥ 0.25.0-lotus.10) when it arrives — "connection was
good", "3 reconnects", "connection was poor for 4 min". Nothing is
stored or sent; the summary is one postMessage at hangup. Without the
fork summary the toast still shows the duration.

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

src/app/components/CallEmbedProvider.tsx

@@ -47,6 +47,7 @@ import { previewRingtone, startRingtone, unlockRingtoneAudio } from '../utils/ri
 import { useCallMembersChange, useCallSession } from '../hooks/useCall';
 import { useCallJoinLeaveSounds } from '../hooks/useCallJoinLeaveSounds';
 import { useCallPolicyRevokedToast } from '../hooks/useCallPolicyRevokedToast';
+import { useCallEndedToast } from '../hooks/useCallEndedToast';
 import { useCallAnnouncements } from '../hooks/useCallAnnouncements';
 import { useMutedTalkWarning } from '../hooks/useMutedTalkWarning';
 import { callAnnouncementAtom } from '../state/callAnnouncement';
@@ -744,6 +745,7 @@ function CallUtils({ embed, joined }: { embed: CallEmbed; joined: boolean }) {
   useAfkAutoMute(joined ? embed : undefined);
   useCallJoinLeaveSounds(embed);
   useCallPolicyRevokedToast(embed, joined);
+  useCallEndedToast(embed);
   useCallAnnouncements(embed, joined);
   useMutedTalkWarning(embed, joined);
   useCallThemeSync(embed);