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/dashboard-editor.tsx

@@ -15,7 +15,7 @@ import {
 import {
     SortableContext,
     sortableKeyboardCoordinates,
-    rectSortingStrategy,
+    verticalListSortingStrategy,
     arrayMove,
 } from "@dnd-kit/sortable"
 import { Button } from "@/components/ui/button"
@@ -81,7 +81,7 @@ export function DashboardEditor({
         >
             <SortableContext
                 items={widgets.map(w => w.id)}
-                strategy={rectSortingStrategy}
+                strategy={verticalListSortingStrategy}
             >
                 {children}
             </SortableContext>
@@ -126,32 +126,3 @@ export function DashboardEditor({
     )
 }
 
-// Edit button component to add to the header
-export function EditDashboardButton({
-    isEditMode,
-    onToggle
-}: {
-    isEditMode: boolean
-    onToggle: () => void
-}) {
-    return (
-        <Button
-            variant={isEditMode ? "default" : "outline"}
-            size="sm"
-            className="h-8 gap-2"
-            onClick={onToggle}
-        >
-            {isEditMode ? (
-                <>
-                    <X className="h-4 w-4" />
-                    <span className="hidden sm:inline">Cancel</span>
-                </>
-            ) : (
-                <>
-                    <Edit3 className="h-4 w-4" />
-                    <span className="hidden sm:inline">Edit Layout</span>
-                </>
-            )}
-        </Button>
-    )
-}