chore: v0.1.2 — 全面修复、优化与增强

修复:
- core.js: _resume 计时器 BUG (startedAt 被 _startTimer 覆盖导致暂停恢复失效)
- plugins.js: register 在 install 前展开导致 handler 实例丢失
- locales.js: zh-CN/en-US 大量重复 key 覆盖正确翻译值
- core.js: configure 改为原地更新避免 _config 引用断裂

优化:
- core.js: update() 类型变更时同步更新 DOM 类名和进度条颜色
- animations.js: getActiveCount 返回已注册动画数量
- themes.js: 移除 presetThemes 死代码和重复注册循环
- constants.js: THEMES.auto 从字符串改为规范化对象
- index.js: destroy 添加防重复调用保护

增强:
- core.js: 新增 onError 全局错误回调，钩子异常和定时器错误可被外部捕获
- styles.js: _resume 校准时间基准补偿注释
- 139 tests 全部通过

src/core.js

@@ -1,7 +1,7 @@
 /**
  * MetonaToast Core - 核心Toast逻辑
  * @module core
- * @version 0.1.1
+ * @version 0.1.2
  * @description 重构后的核心模块，包含Toast类的优化实现
  */
 
@@ -68,7 +68,15 @@ class Toast {
   }
   static trigger(name, toast) {
     const list = this._hooks.get(name);
-    if (list) list.forEach(fn => { try { fn(toast); } catch (e) { console.error('Hook error:', name, e); } });
+    if (list) list.forEach(fn => {
+      try { fn(toast); }
+      catch (e) {
+        console.error('Hook error:', name, e);
+        if (meToast._config.onError) {
+          try { meToast._config.onError({ hook: name, error: e, toast }); } catch (_) {}
+        }
+      }
+    });
   }
 
   constructor(opts) {
@@ -392,33 +400,43 @@ class Toast {
     });
   }
 
-  _startTimer() {
+  _startTimer(resuming = false) {
     if (this.config.duration <= 0) return;
-    
-    this.startedAt = Date.now();
-    this.remaining = this.config.duration;
-    
+
+    // 仅在首次启动时重置时间基准；resume 场景由 _resume() 预先调整 startedAt
+    if (!resuming) {
+      this.startedAt = Date.now();
+      this.remaining = this.config.duration;
+    }
+
     const tick = () => {
       if (this.paused || this.closing) return;
-      
-      const elapsed = Date.now() - this.startedAt;
-      this.remaining = Math.max(0, this.config.duration - elapsed);
-      
-      if (this.barEl) {
-        const ratio = this.remaining / this.config.duration;
-        const t = this.config.progressDirection === 'vertical'
-          ? `scaleY(${ratio})` : `scaleX(${ratio})`;
-        this.barEl.style.transform = t;
+
+      try {
+        const elapsed = Date.now() - this.startedAt;
+        this.remaining = Math.max(0, this.config.duration - elapsed);
+
+        if (this.barEl) {
+          const ratio = this.remaining / this.config.duration;
+          const t = this.config.progressDirection === 'vertical'
+            ? `scaleY(${ratio})` : `scaleX(${ratio})`;
+          this.barEl.style.transform = t;
+        }
+
+        if (this.remaining <= 0) {
+          this.close();
+          return;
+        }
+      } catch (e) {
+        console.error('Timer tick error:', e);
+        if (meToast._config.onError) {
+          try { meToast._config.onError({ source: 'timer', error: e, toast: this }); } catch (_) {}
+        }
       }
-      
-      if (this.remaining <= 0) { 
-        this.close(); 
-        return; 
-      }
-      
+
       this.rafId = requestAnimationFrame(tick);
     };
-    
+
     this.rafId = requestAnimationFrame(tick);
   }
 
@@ -432,19 +450,37 @@ class Toast {
   _resume() {
     if (!this.paused) return;
     this.paused = false;
+    // 校准时间基准，补偿暂停期间经过的时间
     this.startedAt = Date.now() - (this.config.duration - this.remaining);
-    this._startTimer();
+    this._startTimer(true);
   }
 
   update(partial) {
     Toast.trigger('beforeUpdate', this);
+    const typeChanged = partial.type && partial.type !== this.type;
     if (partial.type) this.type = partial.type;
     if (partial.title !== undefined) this.title = partial.title;
     if (partial.message !== undefined) this.message = partial.message;
     if (partial.html !== undefined) this.html = partial.html;
-    
+
     if (!this.el) { Toast.trigger('afterUpdate', this); return this; }
-    
+
+    // 类型变更时同步更新 DOM 类名、边框颜色和进度条颜色
+    if (typeChanged) {
+      const typeClasses = ['met-success', 'met-error', 'met-warning', 'met-info', 'met-loading', 'met-default'];
+      typeClasses.forEach(c => this.el.classList.remove(c));
+      this.el.classList.add(`met-${this.type}`);
+      if (this.barEl) {
+        const c = (TYPE_COLORS[this.type] || TYPE_COLORS.default);
+        this.barEl.style.background = c.fg;
+      }
+      const side = this.el.querySelector('.met-side');
+      if (side) {
+        const c = (TYPE_COLORS[this.type] || TYPE_COLORS.default);
+        side.style.background = c.fg;
+      }
+    }
+
     const content = this.el.querySelector('.met-content');
     if (content) {
       const safeTitle = this.title ? `<div class="met-title">${escapeHTML(this.title)}</div>` : '';
@@ -453,7 +489,7 @@ class Toast {
         : (this.message ? `<div class="met-message">${escapeHTML(this.message)}</div>` : '');
       content.innerHTML = `${safeTitle}${safeMessage}`;
     }
-    
+
     // resetTimerOnUpdate: 更新内容后重置计时器
     if (this.config.resetTimerOnUpdate && this.config.duration > 0) {
       cancelAnimationFrame(this.rafId);
@@ -461,11 +497,11 @@ class Toast {
       this.remaining = this.config.duration;
       this._startTimer();
     }
-    
+
     if (typeof this.config.onUpdate === 'function') {
       try { this.config.onUpdate(this); } catch (e) { console.error('onUpdate callback error:', e); }
     }
-    
+
     Toast.trigger('afterUpdate', this);
     return this;
   }
@@ -621,11 +657,12 @@ const _actionHTML = (actions) => {
 const meToast = {
   _toasts: new Map(),
   _config: { ...DEFAULTS },
-  version: '0.1.1',
+  version: '0.1.2',
   
   configure(opts) {
     if (!opts || typeof opts !== 'object') return this;
-    this._config = { ...this._config, ...opts };
+    // 原地更新，保持 _config 引用一致（index.js 的增强对象共享同一个 _config）
+    Object.assign(this._config, opts);
     
     if (opts.theme) {
       applyTheme(opts.theme);