Refactor UI imports and update component paths

Replaces imports from 'components/ui' with 'components/common' across the app and dashboard pages, and updates model and API imports to use new paths under 'lib'. Removes redundant authentication checks from several dashboard pages. Adds new dashboard components and utility files, and reorganizes hooks and services into the 'lib' directory for improved structure.

components/common/calendar.tsx

@@ -0,0 +1,67 @@
+"use client"
+
+import * as React from "react"
+import { ChevronLeft, ChevronRight } from "lucide-react"
+import { DayPicker } from "react-day-picker"
+
+import { cn } from "@/lib/utils/styles";
+import { buttonVariants } from "@/components/common/button"
+
+export type CalendarProps = React.ComponentProps<typeof DayPicker>
+
+function Calendar({
+  className,
+  classNames,
+  showOutsideDays = true,
+  ...props
+}: CalendarProps) {
+  return (
+    <DayPicker
+      showOutsideDays={showOutsideDays}
+      className={cn("p-3", className)}
+      classNames={{
+        months: "flex flex-col sm:flex-row space-y-4 sm:space-x-4 sm:space-y-0",
+        month: "space-y-4",
+        caption: "flex justify-center pt-1 relative items-center",
+        caption_label: "text-sm font-medium",
+        nav: "space-x-1 flex items-center",
+        nav_button: cn(
+          buttonVariants({ variant: "outline" }),
+          "h-7 w-7 bg-transparent p-0 opacity-50 hover:opacity-100"
+        ),
+        nav_button_previous: "absolute left-1",
+        nav_button_next: "absolute right-1",
+        table: "w-full border-collapse space-y-1",
+        head_row: "flex",
+        head_cell:
+          "text-muted-foreground rounded-md w-9 font-normal text-[0.8rem]",
+        row: "flex w-full mt-2",
+        cell: "h-9 w-9 text-center text-sm p-0 relative [&:has([aria-selected].day-range-end)]:rounded-r-md [&:has([aria-selected].day-outside)]:bg-accent/50 [&:has([aria-selected])]:bg-accent first:[&:has([aria-selected])]:rounded-l-md last:[&:has([aria-selected])]:rounded-r-md focus-within:relative focus-within:z-20",
+        day: cn(
+          buttonVariants({ variant: "ghost" }),
+          "h-9 w-9 p-0 font-normal aria-selected:opacity-100"
+        ),
+        day_range_end: "day-range-end",
+        day_selected:
+          "bg-primary text-primary-foreground hover:bg-primary hover:text-primary-foreground focus:bg-primary focus:text-primary-foreground",
+        day_today: "bg-accent text-accent-foreground",
+        day_outside:
+          "day-outside text-muted-foreground aria-selected:bg-accent/50 aria-selected:text-muted-foreground",
+        day_disabled: "text-muted-foreground opacity-50",
+        day_range_middle:
+          "aria-selected:bg-accent aria-selected:text-accent-foreground",
+        day_hidden: "invisible",
+        ...classNames,
+      }}
+      components={{
+        IconLeft: ({ ...props }) => <ChevronLeft className="h-4 w-4" />,
+        IconRight: ({ ...props }) => <ChevronRight className="h-4 w-4" />,
+      }}
+      {...props}
+    />
+  )
+}
+Calendar.displayName = "Calendar"
+
+export { Calendar }
+