Remove widget resizing and edit mode from dashboard

Eliminated the ability to resize dashboard widgets by removing colSpan from WidgetConfig, related UI, and logic. Removed edit mode functionality and the EditDashboardButton, simplifying the dashboard layout and widget management. Updated drag-and-drop strategy to vertical list and incremented the storage key version.

components/dashboard/draggable-widget.tsx

@@ -1,6 +1,6 @@
 "use client"
 
-import React from "react"
+import React, { useState, useEffect, useRef } from "react"
 import { useSortable } from "@dnd-kit/sortable"
 import { CSS } from "@dnd-kit/utilities"
 import { GripVertical, Settings, X, Eye, EyeOff } from "lucide-react"
@@ -41,21 +41,12 @@ export function DraggableWidget({
         zIndex: isDragging ? 1000 : 1,
     }
 
-    const colSpanClasses = {
-        1: "lg:col-span-1",
-        2: "lg:col-span-2",
-        3: "lg:col-span-3",
-        4: "lg:col-span-4",
-    }[widget.colSpan || 4] || "lg:col-span-4"
-
     return (
         <div
             ref={setNodeRef}
             style={style}
             className={cn(
                 "relative group",
-                colSpanClasses,
-                "md:col-span-2", // Default to 2 columns on tablet
                 isEditMode && "ring-2 ring-primary ring-offset-2 ring-offset-background rounded-lg",
                 isDragging && "z-50 shadow-2xl"
             )}