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/hooks/useSettingsMetadata.ts

@@ -33,10 +33,7 @@ export function useSettingsMetadata(): UseSettingsMetadataResult {
 
         setIsPortable(portable);
       } catch (error) {
-        console.error(
-          "[useSettingsMetadata] Failed to load metadata",
-          error,
-        );
+        console.error("[useSettingsMetadata] Failed to load metadata", error);
       } finally {
         if (active) {
           setIsLoading(false);