Add modular dashboard widgets and layout editor

Introduces a modular dashboard system with draggable, configurable widgets including revenue, low stock, recent customers, and pending chats. Adds a dashboard editor for layout customization, widget visibility, and settings. Refactors dashboard content to use the new widget system and improves UI consistency and interactivity.

components/ui/relative-time.tsx

@@ -0,0 +1,114 @@
+"use client"
+
+import * as React from "react"
+import {
+    Tooltip,
+    TooltipContent,
+    TooltipProvider,
+    TooltipTrigger,
+} from "@/components/ui/tooltip"
+import { format, formatDistanceToNow, isToday, isYesterday, differenceInMinutes } from "date-fns"
+
+interface RelativeTimeProps {
+    date: Date | string | null | undefined
+    className?: string
+    showTooltip?: boolean
+    updateInterval?: number // ms, for auto-updating recent times
+}
+
+/**
+ * RelativeTime - Displays time as "2 hours ago" with full date on hover
+ * Auto-updates for times less than 1 hour old
+ */
+export function RelativeTime({
+    date,
+    className = "",
+    showTooltip = true,
+    updateInterval = 60000 // Update every minute
+}: RelativeTimeProps) {
+    const [, forceUpdate] = React.useReducer(x => x + 1, 0)
+
+    const parsedDate = React.useMemo(() => {
+        if (!date) return null
+        return typeof date === "string" ? new Date(date) : date
+    }, [date])
+
+    // Auto-update for recent times
+    React.useEffect(() => {
+        if (!parsedDate) return
+
+        const minutesAgo = differenceInMinutes(new Date(), parsedDate)
+
+        // Only auto-update if within the last hour
+        if (minutesAgo < 60) {
+            const interval = setInterval(forceUpdate, updateInterval)
+            return () => clearInterval(interval)
+        }
+    }, [parsedDate, updateInterval])
+
+    if (!parsedDate || isNaN(parsedDate.getTime())) {
+        return <span className={className}>-</span>
+    }
+
+    const formatRelative = (d: Date): string => {
+        const now = new Date()
+        const minutesAgo = differenceInMinutes(now, d)
+
+        // Just now (< 1 minute)
+        if (minutesAgo < 1) return "Just now"
+
+        // Minutes ago (< 60 minutes)
+        if (minutesAgo < 60) return `${minutesAgo}m ago`
+
+        // Hours ago (< 24 hours and today)
+        if (isToday(d)) {
+            const hoursAgo = Math.floor(minutesAgo / 60)
+            return `${hoursAgo}h ago`
+        }
+
+        // Yesterday
+        if (isYesterday(d)) return "Yesterday"
+
+        // Use formatDistanceToNow for older dates
+        return formatDistanceToNow(d, { addSuffix: true })
+    }
+
+    const fullDate = format(parsedDate, "dd MMM yyyy, HH:mm")
+    const relativeText = formatRelative(parsedDate)
+
+    if (!showTooltip) {
+        return <span className={className}>{relativeText}</span>
+    }
+
+    return (
+        <TooltipProvider>
+            <Tooltip delayDuration={300}>
+                <TooltipTrigger asChild>
+                    <span className={`cursor-default ${className}`}>{relativeText}</span>
+                </TooltipTrigger>
+                <TooltipContent side="top" className="text-xs">
+                    {fullDate}
+                </TooltipContent>
+            </Tooltip>
+        </TooltipProvider>
+    )
+}
+
+/**
+ * Utility function to get relative time string without component
+ */
+export function getRelativeTimeString(date: Date | string | null | undefined): string {
+    if (!date) return "-"
+    const d = typeof date === "string" ? new Date(date) : date
+    if (isNaN(d.getTime())) return "-"
+
+    const now = new Date()
+    const minutesAgo = differenceInMinutes(now, d)
+
+    if (minutesAgo < 1) return "Just now"
+    if (minutesAgo < 60) return `${minutesAgo}m ago`
+    if (isToday(d)) return `${Math.floor(minutesAgo / 60)}h ago`
+    if (isYesterday(d)) return "Yesterday"
+
+    return formatDistanceToNow(d, { addSuffix: true })
+}