Refactor microphone selection handling in voice components

- Rename `setSelectedDeviceId` to `selectDevice` in `DebugVoicePanel` and `VoiceSessionControls` for clarity and consistency.
- Update `useVoicePreview` hook to implement the `selectDevice` function, enabling dynamic microphone switching during voice sessions.
- Enhance device selection logic to support real-time audio track replacement without requiring session reconnection.

frontend/src/components/pages/AssistantPage.tsx

@@ -1838,7 +1838,7 @@ function DebugVoicePanel({
     messages,
     audioInputs,
     selectedDeviceId,
-    setSelectedDeviceId,
+    selectDevice,
     sendText,
     connect,
     disconnect,
@@ -1868,7 +1868,7 @@ function DebugVoicePanel({
             assistantId={assistantId}
             audioInputs={audioInputs}
             selectedDeviceId={selectedDeviceId}
-            setSelectedDeviceId={setSelectedDeviceId}
+            selectDevice={selectDevice}
             connect={connect}
             disconnect={disconnect}
           />
@@ -1941,9 +1941,8 @@ function DebugVoicePanel({
             <Select
               value={selectedDeviceId || "default"}
               onValueChange={(value) =>
-                setSelectedDeviceId(value === "default" ? "" : value)
+                selectDevice(value === "default" ? "" : value)
               }
-              disabled={recording}
             >
               <SelectTrigger
                 size="sm"
@@ -2044,7 +2043,7 @@ function VoiceSessionControls({
   assistantId,
   audioInputs,
   selectedDeviceId,
-  setSelectedDeviceId,
+  selectDevice,
   connect,
   disconnect,
 }: {
@@ -2054,7 +2053,7 @@ function VoiceSessionControls({
   assistantId: string | null;
   audioInputs: MediaDeviceInfo[];
   selectedDeviceId: string;
-  setSelectedDeviceId: (deviceId: string) => void;
+  selectDevice: (deviceId: string) => void;
   connect: () => Promise<void>;
   disconnect: () => void;
 }) {
@@ -2096,9 +2095,8 @@ function VoiceSessionControls({
         <Select
           value={selectedDeviceId || "default"}
           onValueChange={(value) =>
-            setSelectedDeviceId(value === "default" ? "" : value)
+            selectDevice(value === "default" ? "" : value)
           }
-          disabled={recording}
         >
           <SelectTrigger
             size="sm"