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/popover.tsx

@@ -1,48 +0,0 @@
-"use client";
-
-import * as PopoverPrimitive from "@radix-ui/react-popover";
-import type * as React from "react";
-
-import { cn } from "./utils";
-
-function Popover({
-	...props
-}: React.ComponentProps<typeof PopoverPrimitive.Root>) {
-	return <PopoverPrimitive.Root data-slot="popover" {...props} />;
-}
-
-function PopoverTrigger({
-	...props
-}: React.ComponentProps<typeof PopoverPrimitive.Trigger>) {
-	return <PopoverPrimitive.Trigger data-slot="popover-trigger" {...props} />;
-}
-
-function PopoverContent({
-	className,
-	align = "center",
-	sideOffset = 4,
-	...props
-}: React.ComponentProps<typeof PopoverPrimitive.Content>) {
-	return (
-		<PopoverPrimitive.Portal>
-			<PopoverPrimitive.Content
-				data-slot="popover-content"
-				align={align}
-				sideOffset={sideOffset}
-				className={cn(
-					"bg-popover text-popover-foreground data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 z-50 w-72 origin-(--radix-popover-content-transform-origin) rounded-md border p-4 shadow-md outline-hidden",
-					className,
-				)}
-				{...props}
-			/>
-		</PopoverPrimitive.Portal>
-	);
-}
-
-function PopoverAnchor({
-	...props
-}: React.ComponentProps<typeof PopoverPrimitive.Anchor>) {
-	return <PopoverPrimitive.Anchor data-slot="popover-anchor" {...props} />;
-}
-
-export { Popover, PopoverTrigger, PopoverContent, PopoverAnchor };