fix: use quoted strings for size values in YAML to prevent time parsing

YAML parser interprets 16:9 as time format (16h 9m = 969s).
Using quoted strings "16:9" ensures correct string parsing.

tests/integration/test_presentation.py

@@ -32,7 +32,7 @@ class TestTemplateCaching:
         # 创建使用模板的 YAML
         yaml_content = f"""
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - template: title-slide
@@ -69,7 +69,7 @@ class TestRenderSlide:
         """测试渲染使用模板的幻灯片"""
         yaml_content = f"""
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - template: title-slide
@@ -94,7 +94,7 @@ slides:
         # 有 subtitle 的情况
         yaml_with = f"""
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - template: title-slide
@@ -115,7 +115,7 @@ slides:
         # 没有 subtitle 的情况
         yaml_without = f"""
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - template: title-slide
@@ -136,7 +136,7 @@ slides:
         """测试变量传递"""
         yaml_content = f"""
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - template: title-slide
@@ -164,7 +164,7 @@ class TestPresentationWithoutTemplate:
         """测试直接渲染元素（不使用模板）"""
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:

tests/integration/test_rendering_flow.py

@@ -39,7 +39,7 @@ class TestRenderingFlow:
         """测试文本元素渲染"""
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:
@@ -81,7 +81,7 @@ slides:
         """测试图片元素渲染"""
         yaml_content = f"""
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:
@@ -111,7 +111,7 @@ slides:
         """测试形状元素渲染"""
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:
@@ -145,7 +145,7 @@ slides:
         """测试表格元素渲染"""
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:
@@ -180,7 +180,7 @@ slides:
         """测试背景渲染"""
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - background:
@@ -217,7 +217,7 @@ slides:
         """测试使用模板的幻灯片渲染"""
         yaml_content = f"""
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - template: title-slide
@@ -254,7 +254,7 @@ slides:
         """测试多张幻灯片渲染"""
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:

tests/integration/test_validation_flow.py

@@ -26,7 +26,7 @@ class TestValidationFlow:
         """测试验证包含警告的 YAML"""
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:
@@ -49,7 +49,7 @@ slides:
         """测试验证包含错误的 YAML"""
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:
@@ -81,7 +81,7 @@ slides:
         """测试收集多个错误"""
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:
@@ -110,7 +110,7 @@ slides:
         """测试错误包含位置信息"""
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:
@@ -134,7 +134,7 @@ slides:
         """测试验证使用模板的 YAML"""
         yaml_content = f"""
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - template: title-slide
@@ -155,7 +155,7 @@ slides:
         """测试验证缺少必需变量的模板"""
         yaml_content = f"""
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - template: title-slide
@@ -175,7 +175,7 @@ slides:
         # 创建包含错误和警告的 YAML
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:
@@ -200,7 +200,7 @@ slides:
         """测试验证结果格式化"""
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:
@@ -229,7 +229,7 @@ slides:
         """测试验证图片资源"""
         yaml_content = f"""
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements:
@@ -250,7 +250,7 @@ slides:
         """测试验证不存在的图片资源"""
         yaml_content = """
 metadata:
-  size: 16:9
+  size: "16:9"
 
 slides:
   - elements: