修改在西班牙键盘bar上 ai图标不显示问题

CustomKeyboard/View/KBToolBar.m

@@ -42,6 +42,10 @@
                                                  selector:@selector(kb_undoStateChanged)
                                                      name:KBBackspaceUndoStateDidChangeNotification
                                                    object:nil];
+        [[NSNotificationCenter defaultCenter] addObserver:self
+                                                 selector:@selector(kb_skinDidChange)
+                                                     name:KBSkinDidChangeNotification
+                                                   object:nil];
     }
     return self;
 }
@@ -183,9 +187,14 @@
     KBSkinManager *skinManager = [KBSkinManager shared];
     UIImage *icon = [skinManager iconImageForKeyIdentifier:kKBAIKeyIdentifier caseVariant:0];
     NSString *skinId = skinManager.current.skinId ?: @"";
-    BOOL usingDefaultSkin = (skinId.length == 0 || [skinId isEqualToString:@"default"]);
-    if (!icon && usingDefaultSkin) {
+    
+    NSLog(@"[KBToolBar] kb_updateAIButtonAppearance: skinId=%@ icon=%@", 
+          skinId, icon ? @"有" : @"nil");
+    
+    // 如果当前皮肤没有 ai 图标，使用默认图标
+    if (!icon) {
         icon = [UIImage imageNamed:@"ai_key_icon"];
+        NSLog(@"[KBToolBar] fallback to bundled ai_key_icon: %@", icon ? @"有" : @"nil");
     }
 
     if (icon) {
@@ -472,6 +481,10 @@
     [self kb_updateUndoVisibilityAnimated:YES];
 }
 
+- (void)kb_skinDidChange {
+    [self kb_applyTheme];
+}
+
 - (void)kb_updateUndoVisibilityAnimated:(BOOL)animated {
     BOOL visible = [KBBackspaceUndoManager shared].hasUndo;
     if (self.kbUndoVisible == visible) { return; }