feat(dashboard): Implement Widget Configuration and Display Components

- Added WidgetConfigModal for creating and editing widgets with fields for title, sources, prompt, provider, model, and refresh frequency.
- Integrated MarkdownRenderer for displaying widget content previews.
- Created WidgetDisplay component to show widget details, including loading states, error handling, and source information.
- Developed a reusable Card component structure for consistent UI presentation.
- Introduced useDashboard hook for managing widget state, including adding, updating, deleting, and refreshing widgets.
- Implemented local storage management for dashboard state and settings.
- Added types for widgets, dashboard configuration, and API requests/responses to improve type safety and clarity.

src/components/ui/card.tsx

@@ -0,0 +1,108 @@
+import React from 'react';
+import { cn } from '@/lib/utils';
+
+interface CardProps extends React.HTMLAttributes<HTMLDivElement> {
+  children: React.ReactNode;
+}
+
+interface CardHeaderProps extends React.HTMLAttributes<HTMLDivElement> {
+  children: React.ReactNode;
+}
+
+interface CardContentProps extends React.HTMLAttributes<HTMLDivElement> {
+  children: React.ReactNode;
+}
+
+interface CardFooterProps extends React.HTMLAttributes<HTMLDivElement> {
+  children: React.ReactNode;
+}
+
+interface CardTitleProps extends React.HTMLAttributes<HTMLHeadingElement> {
+  children: React.ReactNode;
+}
+
+interface CardDescriptionProps extends React.HTMLAttributes<HTMLParagraphElement> {
+  children: React.ReactNode;
+}
+
+const Card = React.forwardRef<HTMLDivElement, CardProps>(
+  ({ className, children, ...props }, ref) => (
+    <div
+      ref={ref}
+      className={cn(
+        'rounded-lg border bg-card text-card-foreground shadow-sm',
+        className
+      )}
+      {...props}
+    >
+      {children}
+    </div>
+  )
+);
+Card.displayName = 'Card';
+
+const CardHeader = React.forwardRef<HTMLDivElement, CardHeaderProps>(
+  ({ className, children, ...props }, ref) => (
+    <div
+      ref={ref}
+      className={cn('flex flex-col space-y-1.5 p-6', className)}
+      {...props}
+    >
+      {children}
+    </div>
+  )
+);
+CardHeader.displayName = 'CardHeader';
+
+const CardTitle = React.forwardRef<HTMLParagraphElement, CardTitleProps>(
+  ({ className, children, ...props }, ref) => (
+    <h3
+      ref={ref}
+      className={cn(
+        'text-2xl font-semibold leading-none tracking-tight',
+        className
+      )}
+      {...props}
+    >
+      {children}
+    </h3>
+  )
+);
+CardTitle.displayName = 'CardTitle';
+
+const CardDescription = React.forwardRef<HTMLParagraphElement, CardDescriptionProps>(
+  ({ className, children, ...props }, ref) => (
+    <p
+      ref={ref}
+      className={cn('text-sm text-muted-foreground', className)}
+      {...props}
+    >
+      {children}
+    </p>
+  )
+);
+CardDescription.displayName = 'CardDescription';
+
+const CardContent = React.forwardRef<HTMLDivElement, CardContentProps>(
+  ({ className, children, ...props }, ref) => (
+    <div ref={ref} className={cn('p-6 pt-0', className)} {...props}>
+      {children}
+    </div>
+  )
+);
+CardContent.displayName = 'CardContent';
+
+const CardFooter = React.forwardRef<HTMLDivElement, CardFooterProps>(
+  ({ className, children, ...props }, ref) => (
+    <div
+      ref={ref}
+      className={cn('flex items-center p-6 pt-0', className)}
+      {...props}
+    >
+      {children}
+    </div>
+  )
+);
+CardFooter.displayName = 'CardFooter';
+
+export { Card, CardHeader, CardFooter, CardTitle, CardDescription, CardContent };