fix(playback): Correctly handle UUID argument

- Update the main command loop to correctly parse and pass the
  '--uuid' flag to the showChat function.
- This fixes the 'invalid subcommand' error and makes the detailed
  playback view fully functional.

Makefile

@@ -49,3 +49,4 @@ identify-protobuf:
 
 playback:
 	gemini playback
+	gemini playback --uuid a1b2c3d4-e5f6-4a5b-8c9d-1e2f3a4b5c6d

main.go

@@ -58,14 +58,13 @@ func main() {
 		if err != nil {
 			badExit(err)
 		}
-		verifyUuids(newChats)
-		listChats(newChats)
 		for _, newChat := range newChats.GetChats() {
 			me.chats.AppendByUuid(newChat)
 		}
-		listChats(me.chats)
 
-		me.chats.ConfigSave()
+		if verifyUuids(me.chats) {
+			me.chats.ConfigSave()
+		}
 		okExit("")
 	}