fix: briefing TTS now uses saved voice/speed/blend settings

synthesiseSpeech() called without explicit params now omits voice/speed/
blend from the request body. The backend detects this and auto-loads all
three from the user's saved settings (voice_tts_voice, voice_tts_speed,
voice_tts_blend), so briefing listen mode respects the voice the user
configured in Settings.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/fabledassistant/routes/voice.py

@@ -130,16 +130,25 @@ async def synthesise_speech():
     if not isinstance(voice_blend, list) or len(voice_blend) < 2:
         voice_blend = None
 
-    # Auto-load blend from user settings when no explicit voice/blend provided
-    if voice_blend is None and "voice" not in data and "voice_blend" not in data:
+    # When no explicit voice/blend/speed provided, load all voice settings from the user's profile
+    if "voice" not in data and "voice_blend" not in data and "speed" not in data:
         from fabledassistant.services.settings import get_setting
         from fabledassistant.auth import get_current_user_id
         import json as _json
         try:
             uid = get_current_user_id()
-            stored = await get_setting(uid, "voice_tts_blend", "")
-            if stored:
-                parsed = _json.loads(stored)
+            saved_voice = await get_setting(uid, "voice_tts_voice", "")
+            if saved_voice:
+                voice = saved_voice
+            saved_speed = await get_setting(uid, "voice_tts_speed", "")
+            if saved_speed:
+                try:
+                    speed = float(saved_speed)
+                except ValueError:
+                    pass
+            saved_blend = await get_setting(uid, "voice_tts_blend", "")
+            if saved_blend:
+                parsed = _json.loads(saved_blend)
                 if isinstance(parsed, list) and len(parsed) >= 2:
                     voice_blend = parsed
         except Exception: