fix: voice transcript display, audio file persistence, debug logging

Matthias Nott

2026-03-22 fee149c1fbc63f52aa66148018e569e30cca6161

 lib/models/message.dart
..
..
@@ -114,18 +114,21 @@
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     };
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   }
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-  /// Lightweight JSON for persistence (strips temp audio paths, keeps images).
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+  /// Lightweight JSON for persistence (strips base64 audio, keeps file paths and images).
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   Map<String, dynamic> toJsonLight() {
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+    // Keep audioUri if it's a file path (starts with '/') — these are saved audio files.
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+    // Strip base64 audio data (large, temp) — those won't survive restart.
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+    final keepAudio = audioUri != null && audioUri!.startsWith('/');
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     return {
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       'id': id,
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       'role': role.name,
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       'type': type.name,
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       'content': content,
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+      if (keepAudio) 'audioUri': audioUri,
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       'timestamp': timestamp,
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       if (status != null) 'status': status!.name,
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       if (duration != null) 'duration': duration,
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       // Keep imageBase64 — images are typically 50-200 KB and must survive restart.
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-      // audioUri is intentionally omitted: it is a temp file path that won't survive restart.
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       if (imageBase64 != null) 'imageBase64': imageBase64,
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     };
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   }