feat: Implement theme toggling and enhance dashboard component theming

This commit introduces a theme toggle functionality in the application header
and improves the visual consistency of dashboard components across different
color schemes.

- Added light/dark mode toggle to  using Mantine's .
- Ensured all  components in  have visible borders in both light and dark modes by adding the  prop.
- Made  colors in  theme-aware, dynamically adjusting their background color based on the active color scheme.

Additionally, this commit includes a large refactoring operation, moving various
component files from  to  and updating
their references.

src/components/ui/badge.tsx

@@ -1,51 +0,0 @@
-import {
-	Badge as MantineBadge,
-	type BadgeProps as MantineBadgeProps,
-} from "@mantine/core";
-import { cn } from "./utils";
-
-interface BadgeProps extends MantineBadgeProps {
-	variant?: "default" | "secondary" | "destructive" | "success";
-}
-
-const Badge = ({
-	className,
-	variant = "default",
-	children,
-	...props
-}: BadgeProps) => {
-	let mantineVariant: MantineBadgeProps["variant"];
-	let mantineColor: MantineBadgeProps["color"];
-
-	switch (variant) {
-		case "secondary":
-			mantineVariant = "light";
-			mantineColor = "gray";
-			break;
-		case "destructive":
-			mantineVariant = "filled";
-			mantineColor = "red";
-			break;
-		case "success":
-			mantineVariant = "filled";
-			mantineColor = "green";
-			break;
-		default:
-			mantineVariant = "filled";
-			mantineColor = "blue"; // Placeholder, should align with primary color
-			break;
-	}
-
-	return (
-		<MantineBadge
-			variant={mantineVariant}
-			color={mantineColor}
-			className={cn(className)}
-			{...props}
-		>
-			{children}
-		</MantineBadge>
-	);
-};
-
-export { Badge };