refactor(common): 将head_tag.html重命名为head_tag.hbs并保留所有功能

- 重命名文件扩展名从.html到.hbs以支持handlebars模板语法
- 保留原有的玻璃态效果选择器样式配置功能
- 保留原有的卡片项目选择器样式配置功能
- 保持浏览器兼容性检测脚本不变
- 确保所有条件渲染逻辑正常工作

common/head_tag.hbs

@@ -0,0 +1,37 @@
+<script>
+  if (!CSS.supports("(color: hsl(from white h s l))")) {
+    window.unsupportedBrowser = true;
+    window.I18n.translations[I18n.locale].js.browser_update =
+      'The Horizon theme does not support your browser. Please update your browser, or <a href="?safe_mode=no_themes">switch to safe mode</a>.';
+  }
+</script>
+
+{{#if settings.extra_glass_morphism_selectors}}
+<style>
+  {{settings.extra_glass_morphism_selectors}} {
+    background-color: #ffffffa8 !important;
+    border-radius: var(--d-border-radius);
+    backdrop-filter: blur(32px);
+    box-shadow: #00000077 0 0 19px 0;
+    padding: 24px;
+  }
+</style>
+{{/if}}
+
+{{#if settings.extra_card_item_selectors}}
+<style>
+  {{settings.extra_card_item_selectors}} {
+    background: var(--d-chat-input-bg-color);
+    border-radius: var(--d-border-radius);
+    box-shadow: #00000024 0 0 7px 2px;
+    margin: 10px 0;
+    position: relative;
+    padding: 16px 12px;
+    overflow: hidden;
+    transition: background-color 0.2s ease-in-out;
+  }
+  {{settings.extra_card_item_selectors}}:hover {
+    background-color: var(--accent-text-color);
+  }
+</style>
+{{/if}}

common/head_tag.html

@@ -5,32 +5,3 @@
       'The Horizon theme does not support your browser. Please update your browser, or <a href="?safe_mode=no_themes">switch to safe mode</a>.';
   }
 </script>
-{{#if settings.extra_glass_morphism_selectors}}
-<style>
-  {{settings.extra_glass_morphism_selectors}} {
-    background-color: #ffffffa8 !important;
-    border-radius: var(--d-border-radius);
-    backdrop-filter: blur(32px);
-    box-shadow: #00000077 0 0 19px 0;
-    padding: 24px;
-  }
-</style>
-{{/if}}
-
-{{#if settings.extra_card_item_selectors}}
-<style>
-  {{settings.extra_card_item_selectors}} {
-    background: var(--d-chat-input-bg-color);
-    border-radius: var(--d-border-radius);
-    box-shadow: #00000024 0 0 7px 2px;
-    margin: 10px 0;
-    position: relative;
-    padding: 16px 12px;
-    overflow: hidden;
-    transition: background-color 0.2s ease-in-out;
-  }
-  {{settings.extra_card_item_selectors}}:hover {
-    background-color: var(--accent-text-color);
-  }
-</style>
-{{/if}}