fix(chat): apply unlocked voice audio url

src/stores/chat/__tests__/chat-machine.transitions.test.ts

@@ -59,6 +59,7 @@ function makeUnlockPrivateResponse(
   return UnlockPrivateResponse.from({
     unlocked: true,
     content: "unlocked content",
+    audioUrl: "",
     reason: "ok",
     creditBalance: 90,
     creditsCharged: 10,
@@ -740,7 +741,7 @@ describe("chatMachine transitions", () => {
     actor.stop();
   });
 
-  it("keeps voice message content unchanged after unlock succeeds", async () => {
+  it("applies the real voice audio url after unlock succeeds", async () => {
     const actor = createActor(
       createTestChatMachine({
         historyMessages: [
@@ -749,7 +750,6 @@ describe("chatMachine transitions", () => {
             content: "Original voice transcript.",
             isFromAI: true,
             date: "2026-06-29",
-            audioUrl: "https://example.com/voice.mp3",
             locked: true,
             lockReason: "voice_message",
             privateMessageHint: "A voice message is waiting.",
@@ -759,6 +759,7 @@ describe("chatMachine transitions", () => {
           messageId: "msg-voice-locked",
           response: makeUnlockPrivateResponse({
             content: "This response content must be ignored.",
+            audioUrl: "https://example.com/unlocked-voice.mp3",
           }),
         },
       }),
@@ -783,7 +784,7 @@ describe("chatMachine transitions", () => {
       {
         id: "msg-voice-locked",
         content: "Original voice transcript.",
-        audioUrl: "https://example.com/voice.mp3",
+        audioUrl: "https://example.com/unlocked-voice.mp3",
         locked: false,
         lockReason: null,
         privateMessageHint: null,
@@ -802,7 +803,6 @@ describe("chatMachine transitions", () => {
             content: "",
             isFromAI: true,
             date: "2026-06-29",
-            audioUrl: "https://example.com/voice.mp3",
             locked: true,
             lockReason: "voice_message",
             privateMessageHint: "A voice message is waiting.",
@@ -855,6 +855,14 @@ describe("chatMachine transitions", () => {
       requiredCredits: 10,
       shortfallCredits: 7,
     });
+    expect(actor.getSnapshot().context.messages).toMatchObject([
+      {
+        id: "msg-voice-locked",
+        locked: true,
+        lockReason: "voice_message",
+      },
+    ]);
+    expect(actor.getSnapshot().context.messages[0]?.audioUrl).toBeUndefined();
     expect(actor.getSnapshot().context.isUnlockingMessage).toBe(false);
 
     actor.stop();