feat: add dining app promo (#598)

* feat: add DiningAppPromo component and integrate it into Calendar

* feat: update WhatsNewPopup with new features and app download link

* fix: remove outdated links

* chore: run lint

* chore: run prettier

* feat: enhance DiningAppPromo with close button and integrate user preference for promo visibility

* chore: run lint

* chore: run check types

* fix: correct promo visibility logic in Calendar component

* feat: centralize app store URLs in appUrls.ts

* chore: run lint

* feat: integrate UT Dining promo image

* chore: run lint

* fix: update logo in WhatsNew popup to use LD icon

* fix: convert URLs to URL objects for consistency

* fix: update LD icon in WhatsNew popup to new version

* fix: update description for Coffee Shops feature to clarify operating times

* fix: rename promo state and storage key to showUTDiningPromo for clarity

---------

Co-authored-by: doprz <52579214+doprz@users.noreply.github.com>

src/shared/util/appUrls.ts

@@ -0,0 +1,19 @@
+/**
+ * This file contains URLs for external applications and resources.
+ * Centralizing these URLs makes it easier to track, update, and manage them in a single place.
+ */
+
+/**
+ * URL to the UT Dining app on the App Store
+ */
+export const UT_DINING_APP_STORE_URL = new URL('https://apps.apple.com/us/app/ut-dining/id6743042002').toString();
+
+/**
+ * URL to the UT Dining app on the Google Play Store (currently not available)
+ */
+export const UT_DINING_GOOGLE_PLAY_URL = ''; // Placeholder for Google Play URL, Android app not available yet
+
+/**
+ * URL to the promo image
+ */
+export const UT_DINING_PROMO_IMAGE_URL = new URL('https://cdn.longhorns.dev/ut-dining-advert1.png').toString();