Update models.py

Updated Preferences dataclass with a new field:

alarm_duration_seconds: int = 0

Kept ServerState.save_preferences() unchanged so alarm_duration_seconds is automatically serialized into preferences.json.

linux_voice_assistant/models.py

@@ -64,6 +64,10 @@ class Preferences:
     active_wake_words: List[str] = field(default_factory=list)
     volume_level: float = 1.0
     num_leds: int = 3
+    # New: configurable alarm duration in seconds.
+    # 0 = infinite alarm (only Stop/wake word stops it)
+    # >0 = auto-stop alarm after this many seconds
+    alarm_duration_seconds: int = 0
 
 
 @dataclass
@@ -112,5 +116,8 @@ class ServerState:
         self.preferences_path.parent.mkdir(parents=True, exist_ok=True)
         with open(self.preferences_path, "w", encoding="utf-8") as preferences_file:
             json.dump(
-                asdict(self.preferences), preferences_file, ensure_ascii=False, indent=4
+                asdict(self.preferences),
+                preferences_file,
+                ensure_ascii=False,
+                indent=4,
             )