fix(ui): add dark mode support for provider modals

- Add dark mode styles to ProviderForm modal (background, borders, text)
- Update ApiKeyInput component with dark mode colors
- Add dark mode detection to ClaudeConfigEditor for JSON editor
- Apply dark mode styles to CodexConfigEditor textareas
- Update PresetSelector buttons for dark mode
- Ensure consistent amber color scheme for all hint boxes in dark mode

This ensures proper visibility and readability of add/edit provider dialogs
when dark mode is enabled.

src/components/ProviderForm/ClaudeConfigEditor.tsx

@@ -1,4 +1,4 @@
-import React from "react";
+import React, { useEffect, useState } from "react";
 import JsonEditor from "../JsonEditor";
 
 interface ClaudeConfigEditorProps {
@@ -14,21 +14,47 @@ const ClaudeConfigEditor: React.FC<ClaudeConfigEditorProps> = ({
   disableCoAuthored,
   onCoAuthoredToggle,
 }) => {
+  const [isDarkMode, setIsDarkMode] = useState(false);
+
+  useEffect(() => {
+    // 检测暗色模式
+    const checkDarkMode = () => {
+      setIsDarkMode(document.documentElement.classList.contains("dark"));
+    };
+
+    checkDarkMode();
+
+    // 监听暗色模式变化
+    const observer = new MutationObserver((mutations) => {
+      mutations.forEach((mutation) => {
+        if (mutation.attributeName === "class") {
+          checkDarkMode();
+        }
+      });
+    });
+
+    observer.observe(document.documentElement, {
+      attributes: true,
+      attributeFilter: ["class"],
+    });
+
+    return () => observer.disconnect();
+  }, []);
   return (
     <div className="space-y-2">
       <div className="flex items-center justify-between">
         <label
           htmlFor="settingsConfig"
-          className="block text-sm font-medium text-gray-900"
+          className="block text-sm font-medium text-gray-900 dark:text-gray-100"
         >
           Claude Code 配置 (JSON) *
         </label>
-        <label className="inline-flex items-center gap-2 text-sm text-gray-500 cursor-pointer">
+        <label className="inline-flex items-center gap-2 text-sm text-gray-500 dark:text-gray-400 cursor-pointer">
           <input
             type="checkbox"
             checked={disableCoAuthored}
             onChange={(e) => onCoAuthoredToggle(e.target.checked)}
-            className="w-4 h-4 text-blue-500 bg-white border-gray-200 rounded focus:ring-blue-500 focus:ring-2"
+            className="w-4 h-4 text-blue-500 bg-white dark:bg-gray-800 border-gray-200 dark:border-gray-700 rounded focus:ring-blue-500 dark:focus:ring-blue-400 focus:ring-2"
           />
           禁止 Claude Code 签名
         </label>
@@ -36,6 +62,7 @@ const ClaudeConfigEditor: React.FC<ClaudeConfigEditorProps> = ({
       <JsonEditor
         value={value}
         onChange={onChange}
+        darkMode={isDarkMode}
         placeholder={`{
   "env": {
     "ANTHROPIC_BASE_URL": "https://your-api-endpoint.com",
@@ -44,7 +71,7 @@ const ClaudeConfigEditor: React.FC<ClaudeConfigEditorProps> = ({
 }`}
         rows={12}
       />
-      <p className="text-xs text-gray-500">
+      <p className="text-xs text-gray-500 dark:text-gray-400">
         完整的 Claude Code settings.json 配置内容
       </p>
     </div>