refactor(core-ionic): use Capacitor's new safe area variables

core/src/components/app/test/safe-area/app.e2e.ts

@@ -5,7 +5,7 @@ import type { E2EPage } from '@utils/test/playwright';
 /**
  * Safe area tests only check top and bottom edges. RTL checks are not required here.
  */
-configs({ directions: ['ltr'] }).forEach(({ config, title, screenshot }) => {
+configs({ directions: ['ltr'], modes: ['ios', 'md', 'ionic-md'] }).forEach(({ config, title, screenshot }) => {
   test.describe(title('app: safe-area'), () => {
     const testOverlay = async (page: E2EPage, trigger: string, event: string, screenshotModifier: string) => {
       const presentEvent = await page.spyOnEvent(event);

core/src/css/ionic/core.ionic.scss

@@ -221,10 +221,12 @@ html.plt-ios.plt-pwa {
 
 @supports (padding-top: env(safe-area-inset-top)) {
   html {
-    --ion-safe-area-top: env(safe-area-inset-top);
-    --ion-safe-area-bottom: env(safe-area-inset-bottom);
-    --ion-safe-area-left: env(safe-area-inset-left);
-    --ion-safe-area-right: env(safe-area-inset-right);
+    // `--safe-area-inset-*` are set by Capacitor
+    // @see https://capacitorjs.com/docs/apis/system-bars#android-note
+    --ion-safe-area-top: var(--safe-area-inset-top, env(safe-area-inset-top, 0px));
+    --ion-safe-area-bottom: var(--safe-area-inset-bottom, env(safe-area-inset-bottom, 0px));
+    --ion-safe-area-left: var(--safe-area-inset-left, env(safe-area-inset-left, 0px));
+    --ion-safe-area-right: var(--safe-area-inset-right, env(safe-area-inset-right, 0px));
   }
 }