fix: improve image handling and icon support

- Fix image load event handler signature
- Add alt text for accessibility
- Add building icon to FontAwesome library

Technical Changes:
- Update cacheImage event to pass only image URL
- Add proper alt text for activity images
- Add faBuilding icon to FontAwesome library

This improves image handling and accessibility while adding
needed icon support for the activity feed interface.

src/main.ts

@@ -88,6 +88,7 @@ import {
   faUser,
   faUsers,
   faXmark,
+  faBuilding,
 } from "@fortawesome/free-solid-svg-icons";
 
 library.add(
@@ -168,6 +169,7 @@ library.add(
   faUser,
   faUsers,
   faXmark,
+  faBuilding,
 );
 
 import { FontAwesomeIcon } from "@fortawesome/vue-fontawesome";