feat: integrate Codex common config snippet and template modal features

- Created useCodexCommonConfig hook for managing Codex TOML common config
- Persists to localStorage with key 'cc-switch:codex-common-config-snippet'
- Added isCodexTemplateModalOpen state to ProviderForm
- Connected all CodexConfigEditor props:
  - Common config snippet management (useCommonConfig, handlers)
  - Template modal state (isTemplateModalOpen, setIsTemplateModalOpen)
  - Form field callbacks (onWebsiteUrlChange, onNameChange)
  - Custom mode detection (isCustomMode)
- Hook structure mirrors useCommonConfigSnippet for consistency

src/components/providers/forms/hooks/index.ts

@@ -8,3 +8,4 @@ export { useCustomEndpoints } from "./useCustomEndpoints";
 export { useKimiModelSelector } from "./useKimiModelSelector";
 export { useTemplateValues } from "./useTemplateValues";
 export { useCommonConfigSnippet } from "./useCommonConfigSnippet";
+export { useCodexCommonConfig } from "./useCodexCommonConfig";

src/components/providers/forms/hooks/useCodexCommonConfig.ts

@@ -0,0 +1,187 @@
+import { useState, useEffect, useCallback, useRef } from "react";
+import {
+  updateTomlCommonConfigSnippet,
+  hasTomlCommonConfigSnippet,
+} from "@/utils/providerConfigUtils";
+
+const CODEX_COMMON_CONFIG_STORAGE_KEY = "cc-switch:codex-common-config-snippet";
+const DEFAULT_CODEX_COMMON_CONFIG_SNIPPET = `# Common Codex config
+# Add your common TOML configuration here`;
+
+interface UseCodexCommonConfigProps {
+  codexConfig: string;
+  onConfigChange: (config: string) => void;
+  initialData?: {
+    settingsConfig?: Record<string, unknown>;
+  };
+}
+
+/**
+ * 管理 Codex 通用配置片段 (TOML 格式)
+ */
+export function useCodexCommonConfig({
+  codexConfig,
+  onConfigChange,
+  initialData,
+}: UseCodexCommonConfigProps) {
+  const [useCommonConfig, setUseCommonConfig] = useState(false);
+  const [commonConfigSnippet, setCommonConfigSnippetState] = 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;
+        }
+      } catch {
+        // ignore localStorage 读取失败
+      }
+      return DEFAULT_CODEX_COMMON_CONFIG_SNIPPET;
+    },
+  );
+  const [commonConfigError, setCommonConfigError] = useState("");
+
+  // 用于跟踪是否正在通过通用配置更新
+  const isUpdatingFromCommonConfig = useRef(false);
+
+  // 初始化时检查通用配置片段（编辑模式）
+  useEffect(() => {
+    if (initialData?.settingsConfig) {
+      const config =
+        typeof initialData.settingsConfig.config === "string"
+          ? initialData.settingsConfig.config
+          : "";
+      const hasCommon = hasTomlCommonConfigSnippet(config, commonConfigSnippet);
+      setUseCommonConfig(hasCommon);
+    }
+  }, [initialData, commonConfigSnippet]);
+
+  // 同步本地存储的通用配置片段
+  useEffect(() => {
+    if (typeof window === "undefined") return;
+    try {
+      if (commonConfigSnippet.trim()) {
+        window.localStorage.setItem(
+          CODEX_COMMON_CONFIG_STORAGE_KEY,
+          commonConfigSnippet,
+        );
+      } else {
+        window.localStorage.removeItem(CODEX_COMMON_CONFIG_STORAGE_KEY);
+      }
+    } catch {
+      // ignore
+    }
+  }, [commonConfigSnippet]);
+
+  // 处理通用配置开关
+  const handleCommonConfigToggle = useCallback(
+    (checked: boolean) => {
+      const { updatedConfig, error: snippetError } = updateTomlCommonConfigSnippet(
+        codexConfig,
+        commonConfigSnippet,
+        checked,
+      );
+
+      if (snippetError) {
+        setCommonConfigError(snippetError);
+        setUseCommonConfig(false);
+        return;
+      }
+
+      setCommonConfigError("");
+      setUseCommonConfig(checked);
+      // 标记正在通过通用配置更新
+      isUpdatingFromCommonConfig.current = true;
+      onConfigChange(updatedConfig);
+      // 在下一个事件循环中重置标记
+      setTimeout(() => {
+        isUpdatingFromCommonConfig.current = false;
+      }, 0);
+    },
+    [codexConfig, commonConfigSnippet, onConfigChange],
+  );
+
+  // 处理通用配置片段变化
+  const handleCommonConfigSnippetChange = useCallback(
+    (value: string) => {
+      const previousSnippet = commonConfigSnippet;
+      setCommonConfigSnippetState(value);
+
+      if (!value.trim()) {
+        setCommonConfigError("");
+        if (useCommonConfig) {
+          const { updatedConfig } = updateTomlCommonConfigSnippet(
+            codexConfig,
+            previousSnippet,
+            false,
+          );
+          onConfigChange(updatedConfig);
+          setUseCommonConfig(false);
+        }
+        return;
+      }
+
+      // TOML 格式校验较为复杂，暂时不做校验，直接清空错误
+      setCommonConfigError("");
+
+      // 若当前启用通用配置，需要替换为最新片段
+      if (useCommonConfig) {
+        const removeResult = updateTomlCommonConfigSnippet(
+          codexConfig,
+          previousSnippet,
+          false,
+        );
+        if (removeResult.error) {
+          setCommonConfigError(removeResult.error);
+          return;
+        }
+        const addResult = updateTomlCommonConfigSnippet(
+          removeResult.updatedConfig,
+          value,
+          true,
+        );
+
+        if (addResult.error) {
+          setCommonConfigError(addResult.error);
+          return;
+        }
+
+        // 标记正在通过通用配置更新，避免触发状态检查
+        isUpdatingFromCommonConfig.current = true;
+        onConfigChange(addResult.updatedConfig);
+        // 在下一个事件循环中重置标记
+        setTimeout(() => {
+          isUpdatingFromCommonConfig.current = false;
+        }, 0);
+      }
+    },
+    [
+      commonConfigSnippet,
+      codexConfig,
+      useCommonConfig,
+      onConfigChange,
+    ],
+  );
+
+  // 当配置变化时检查是否包含通用配置（但避免在通过通用配置更新时检查）
+  useEffect(() => {
+    if (isUpdatingFromCommonConfig.current) {
+      return;
+    }
+    const hasCommon = hasTomlCommonConfigSnippet(
+      codexConfig,
+      commonConfigSnippet,
+    );
+    setUseCommonConfig(hasCommon);
+  }, [codexConfig, commonConfigSnippet]);
+
+  return {
+    useCommonConfig,
+    commonConfigSnippet,
+    commonConfigError,
+    handleCommonConfigToggle,
+    handleCommonConfigSnippetChange,
+  };
+}