fix: transform link[rel] shortcut icon and apple-touch-icon to be absolute (#13077)

closes #10317

This PR builds upon https://github.com/sveltejs/kit/pull/5583/files to include the shortcut icon and apple-touch-icon rel attributes in addition just icon when transforming the asset URL to be absolute.

Author: teemingc

.changeset/slow-toes-clap.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: transform link[rel='shortcut icon'] and link[rel='apple-touch-icon'] to be absolute to avoid console error when navigating

packages/kit/src/runtime/client/client.js

@@ -46,6 +46,8 @@ import { INVALIDATED_PARAM, TRAILING_SLASH_PARAM, validate_depends } from '../sh
 import { get_message, get_status } from '../../utils/error.js';
 import { writable } from 'svelte/store';
 
+const ICON_REL_ATTRIBUTES = new Set(['icon', 'shortcut icon', 'apple-touch-icon']);
+
 let errored = false;
 
 // We track the scroll position associated with each history entry in sessionStorage,
@@ -2307,7 +2309,9 @@ function _start_router() {
 	// URLs after a pushState/replaceState, resulting in a 404 — see
 	// https://github.com/sveltejs/kit/issues/3748#issuecomment-1125980897
 	for (const link of document.querySelectorAll('link')) {
-		if (link.rel === 'icon') link.href = link.href; // eslint-disable-line
+		if (ICON_REL_ATTRIBUTES.has(link.rel)) {
+			link.href = link.href; // eslint-disable-line
+		}
 	}
 
 	addEventListener('pageshow', (event) => {