fix: unify dialog layout and fix content padding issues

- Fix negative margin overflow in all dialog content areas
- Standardize dialog structure with flex-col layout
- Add consistent py-4 spacing to all content areas
- Ensure proper spacing between header, content, and footer

Affected components:
- AddProviderDialog, EditProviderDialog
- McpFormModal, McpPanel
- UsageScriptModal
- SettingsDialog

All dialogs now follow unified layout pattern:
- DialogContent: flex flex-col max-h-[90vh]
- Content area: flex-1 overflow-y-auto px-6 py-4
- No negative margins that cause content overflow

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

@@ -53,11 +53,12 @@ export function useApiKeyLink({
   }, [selectedPresetId, presetEntries, formWebsiteUrl]);
 
   return {
-    shouldShowApiKeyLink: appType === "claude"
-      ? shouldShowApiKeyLink
-      : appType === "codex"
+    shouldShowApiKeyLink:
+      appType === "claude"
         ? shouldShowApiKeyLink
-        : false,
+        : appType === "codex"
+          ? shouldShowApiKeyLink
+          : false,
     websiteUrl: getWebsiteUrl,
   };
 }