refactor: simplify TOML common config handling by removing markers

- Remove COMMON_CONFIG_MARKER_START/END constants
- Simplify config snippet addition/removal logic
- Use natural append/replace approach instead of markers
- Fix unused variable warning
- Improve user experience with cleaner config output

src/components/ProviderForm.tsx

@@ -128,25 +128,26 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
   const [settingsConfigError, setSettingsConfigError] = useState("");
   // 用于跟踪是否正在通过通用配置更新
   const isUpdatingFromCommonConfig = useRef(false);
-  
+
   // Codex 通用配置状态
   const [useCodexCommonConfig, setUseCodexCommonConfig] = useState(false);
-  const [codexCommonConfigSnippet, setCodexCommonConfigSnippetState] = useState<string>(() => {
-    if (typeof window === "undefined") {
-      return DEFAULT_CODEX_COMMON_CONFIG_SNIPPET;
-    }
-    try {
-      const stored = window.localStorage.getItem(
-        CODEX_COMMON_CONFIG_STORAGE_KEY,
-      );
-      if (stored && stored.trim()) {
-        return stored;
+  const [codexCommonConfigSnippet, setCodexCommonConfigSnippetState] =
+    useState<string>(() => {
+      if (typeof window === "undefined") {
+        return DEFAULT_CODEX_COMMON_CONFIG_SNIPPET;
       }
-    } catch {
-      // ignore localStorage 读取失败
-    }
-    return DEFAULT_CODEX_COMMON_CONFIG_SNIPPET;
-  });
+      try {
+        const stored = window.localStorage.getItem(
+          CODEX_COMMON_CONFIG_STORAGE_KEY,
+        );
+        if (stored && stored.trim()) {
+          return stored;
+        }
+      } catch {
+        // ignore localStorage 读取失败
+      }
+      return DEFAULT_CODEX_COMMON_CONFIG_SNIPPET;
+    });
   const [codexCommonConfigError, setCodexCommonConfigError] = useState("");
   const isUpdatingFromCodexCommonConfig = useRef(false);
   // -1 表示自定义，null 表示未选择，>= 0 表示预设索引
@@ -217,7 +218,11 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
   useEffect(() => {
     if (initialData) {
       if (!isCodex) {
-        const configString = JSON.stringify(initialData.settingsConfig, null, 2);
+        const configString = JSON.stringify(
+          initialData.settingsConfig,
+          null,
+          2,
+        );
         const hasCommon = hasCommonConfigSnippet(
           configString,
           commonConfigSnippet,
@@ -235,7 +240,9 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
           };
           if (config.env) {
             setClaudeModel(config.env.ANTHROPIC_MODEL || "");
-            setClaudeSmallFastModel(config.env.ANTHROPIC_SMALL_FAST_MODEL || "");
+            setClaudeSmallFastModel(
+              config.env.ANTHROPIC_SMALL_FAST_MODEL || "",
+            );
             setBaseUrl(config.env.ANTHROPIC_BASE_URL || ""); // 初始化基础 URL
 
             // 初始化 Kimi 模型选择
@@ -254,7 +261,13 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
         setUseCodexCommonConfig(hasCommon);
       }
     }
-  }, [initialData, commonConfigSnippet, codexCommonConfigSnippet, isCodex, codexConfig]);
+  }, [
+    initialData,
+    commonConfigSnippet,
+    codexCommonConfigSnippet,
+    isCodex,
+    codexConfig,
+  ]);
 
   // 当选择预设变化时，同步类别
   useEffect(() => {
@@ -497,7 +510,7 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
         isUpdatingFromCommonConfig.current = false;
       }, 0);
     }
-    
+
     // 保存通用配置到 localStorage
     if (!validationError && typeof window !== "undefined") {
       try {
@@ -529,10 +542,7 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
     setBaseUrl(""); // 清空基础 URL
 
     // 同步通用配置状态
-    const hasCommon = hasCommonConfigSnippet(
-      configString,
-      commonConfigSnippet,
-    );
+    const hasCommon = hasCommonConfigSnippet(configString, commonConfigSnippet);
     setUseCommonConfig(hasCommon);
     setCommonConfigError("");
 
@@ -643,10 +653,7 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
     updateSettingsConfigValue(configString);
 
     // 同步通用配置开关
-    const hasCommon = hasCommonConfigSnippet(
-      configString,
-      commonConfigSnippet,
-    );
+    const hasCommon = hasCommonConfigSnippet(configString, commonConfigSnippet);
     setUseCommonConfig(hasCommon);
   };
 
@@ -681,11 +688,12 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
 
   // Codex: 处理通用配置开关
   const handleCodexCommonConfigToggle = (checked: boolean) => {
-    const { updatedConfig, error: snippetError } = updateTomlCommonConfigSnippet(
-      codexConfig,
-      codexCommonConfigSnippet,
-      checked,
-    );
+    const { updatedConfig, error: snippetError } =
+      updateTomlCommonConfigSnippet(
+        codexConfig,
+        codexCommonConfigSnippet,
+        checked,
+      );
 
     if (snippetError) {
       setCodexCommonConfigError(snippetError);
@@ -753,10 +761,7 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
     // 保存 Codex 通用配置到 localStorage
     if (typeof window !== "undefined") {
       try {
-        window.localStorage.setItem(
-          CODEX_COMMON_CONFIG_STORAGE_KEY,
-          value,
-        );
+        window.localStorage.setItem(CODEX_COMMON_CONFIG_STORAGE_KEY, value);
       } catch {
         // ignore localStorage 写入失败
       }
@@ -1177,7 +1182,9 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
                 useCommonConfig={useCodexCommonConfig}
                 onCommonConfigToggle={handleCodexCommonConfigToggle}
                 commonConfigSnippet={codexCommonConfigSnippet}
-                onCommonConfigSnippetChange={handleCodexCommonConfigSnippetChange}
+                onCommonConfigSnippetChange={
+                  handleCodexCommonConfigSnippetChange
+                }
                 commonConfigError={codexCommonConfigError}
                 authError={codexAuthError}
               />