Fix 0m meeting time for skipped/auto-named speakers

Speakers persisted via skipNaming (the "Skip" button and the
auto-dismiss path) were created without totalMeetingDuration or
totalWordCount, so they defaulted to 0 and showed "0m" in the
Speakers settings tab even after being renamed. saveSpeakerName
already carried these stats from the naming candidate; skipNaming
now does the same.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W14mbfXxsSN9dEBdwApYmH

Author: claude

Sources/HeardCore/AppModel.swift

@@ -776,6 +776,8 @@ public var filteredSpeakers: [SpeakerProfile] {
                     firstSeen: Date(),
                     lastSeen: Date(),
                     meetingCount: 1,
+                    totalMeetingDuration: candidate.totalMeetingDuration,
+                    totalWordCount: candidate.totalWordCount,
                     audioClipURLs: persistedClips
                 )
             )