fix(recordings): stop faking duration from file size + render edited content in search

The voice_recordings table has no duration column, but the backend aliased
duration_bytes = size_bytes (file size in bytes) and RecordingCard divided it
by 60 as if it were seconds — a 3MB MP3 rendered as a nonsensical '55924:3'
fake timestamp. Drop the fabricated field and show real file size instead.

Also render edited_content fallback in the analysis search results for
consistency with message cards/detail.

services/frontend/src/lib/types/recording.ts

@@ -8,8 +8,6 @@ export interface VoiceRecording {
   channel_name?: string | null;
   filename: string;
   size_bytes: number;
-  /** Present on REST rows; absent on WS voice_recording_uploaded events */
-  duration_bytes?: number | null;
   download_url?: string | null;
   upload_status: string;
   upload_error?: string | null;