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/checkbox.tsx

@@ -1,32 +0,0 @@
-"use client";
-
-import * as CheckboxPrimitive from "@radix-ui/react-checkbox";
-import { CheckIcon } from "lucide-react";
-import type * as React from "react";
-
-import { cn } from "./utils";
-
-function Checkbox({
-	className,
-	...props
-}: React.ComponentProps<typeof CheckboxPrimitive.Root>) {
-	return (
-		<CheckboxPrimitive.Root
-			data-slot="checkbox"
-			className={cn(
-				"peer border bg-input-background dark:bg-input/30 data-[state=checked]:bg-primary data-[state=checked]:text-primary-foreground dark:data-[state=checked]:bg-primary data-[state=checked]:border-primary focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive size-4 shrink-0 rounded-[4px] border shadow-xs transition-shadow outline-none focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50",
-				className,
-			)}
-			{...props}
-		>
-			<CheckboxPrimitive.Indicator
-				data-slot="checkbox-indicator"
-				className="flex items-center justify-center text-current transition-none"
-			>
-				<CheckIcon className="size-3.5" />
-			</CheckboxPrimitive.Indicator>
-		</CheckboxPrimitive.Root>
-	);
-}
-
-export { Checkbox };