fix(toast): stabilize desktop voice toast window

修复 Windows/mac 独立 /toast 页面里的语音准备框与准备完成框计时器竞争。\n\n补齐蓝框与绿框的隐藏定时器管理，并在两者切换时互斥清理，避免旧回调误伤新的提示显示。

Author: yiyiyiyiGKY

templates/toast.html

@@ -102,6 +102,9 @@
         // ===== Voice Preparing Toast =====
         var voiceAnimInjected = false;
         var spinAnimInjected = false;
+        var voicePreparingHideTimer = null;
+        var voiceReadyToastTimer = null;
+        var voiceReadyHideTimer = null;
 
         function injectVoiceAnimations() {
             if (voiceAnimInjected) return;
@@ -125,6 +128,8 @@
         function showVoicePreparing(message) {
             injectVoiceAnimations();
             injectSpinAnimation();
+            hideReadyToSpeak();
+            clearVoicePreparingHideTimer();
 
             var toast = document.getElementById('voice-preparing-toast');
             if (!toast) {
@@ -155,11 +160,33 @@
             toast.appendChild(span);
         }
 
+        function clearVoicePreparingHideTimer() {
+            if (voicePreparingHideTimer) {
+                clearTimeout(voicePreparingHideTimer);
+                voicePreparingHideTimer = null;
+            }
+        }
+
+        function clearVoiceReadyTimers() {
+            if (voiceReadyToastTimer) {
+                clearTimeout(voiceReadyToastTimer);
+                voiceReadyToastTimer = null;
+            }
+            if (voiceReadyHideTimer) {
+                clearTimeout(voiceReadyHideTimer);
+                voiceReadyHideTimer = null;
+            }
+        }
+
         function hideVoicePreparing() {
             var toast = document.getElementById('voice-preparing-toast');
             if (toast) {
+                clearVoicePreparingHideTimer();
                 toast.style.animation = 'voiceToastFadeIn 0.3s ease reverse';
-                setTimeout(function() { toast.style.display = 'none'; }, 300);
+                voicePreparingHideTimer = setTimeout(function() {
+                    voicePreparingHideTimer = null;
+                    toast.style.display = 'none';
+                }, 300);
             }
         }
 
@@ -182,8 +209,18 @@
         }
 
         // ===== Voice Ready Toast =====
+        function hideReadyToSpeak() {
+            var toast = document.getElementById('voice-ready-toast');
+            if (toast) {
+                clearVoiceReadyTimers();
+                toast.style.display = 'none';
+            }
+        }
+
         function showReadyToSpeak(message) {
             injectVoiceAnimations();
+            hideVoicePreparing();
+            clearVoiceReadyTimers();
 
             var toast = document.getElementById('voice-ready-toast');
             if (!toast) {
@@ -216,9 +253,13 @@
             toast.appendChild(img);
             toast.appendChild(span);
 
-            setTimeout(function() {
+            voiceReadyToastTimer = setTimeout(function() {
+                voiceReadyToastTimer = null;
                 toast.style.animation = 'voiceToastFadeIn 0.3s ease reverse';
-                setTimeout(function() { toast.style.display = 'none'; }, 300);
+                voiceReadyHideTimer = setTimeout(function() {
+                    voiceReadyHideTimer = null;
+                    toast.style.display = 'none';
+                }, 300);
             }, 2000);
         }