fix: change cancellation policy icon to calendar

Replace document icon with calendar icon for Cancellation & Deposit Policy button in account page Policies section.

frontend/src/routes/account/+page.svelte

@@ -3253,15 +3253,12 @@ import { generateUUID } from '$lib/utils/uuid';
 											fill="none"
 											stroke="currentColor"
 											stroke-width="2"
-											><path
-												d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"
-											/><polyline points="14 2 14 8 20 8" /><line
-												x1="16"
-												y1="13"
-												x2="8"
-												y2="13"
-											/><line x1="16" y1="17" x2="8" y2="17" /></svg
 										>
+											<rect x="3" y="4" width="18" height="18" rx="2" ry="2" />
+											<line x1="16" y1="2" x2="16" y2="6" />
+											<line x1="8" y1="2" x2="8" y2="6" />
+											<line x1="3" y1="10" x2="21" y2="10" />
+										</svg>
 										Cancellation & Deposit Policy
 									</Button>
 								{/snippet}