chore: Rename user imageUrl field

The User.imageUrl field has been renamed to User.image to better reflect its purpose and potentially support non-URL image sources in the future.

This commit updates the sample_app to use the new field name.

Author: xsahil03x

sample_app/lib/login_screen/login_screen.dart

@@ -59,11 +59,11 @@ class _LoginUserListItem extends StatelessWidget {
     return ListTile(
       onTap: onTap,
       leading: CircleAvatar(
-        backgroundImage: switch (credentials.user.imageUrl) {
-          final String imageUrl => CachedNetworkImageProvider(imageUrl),
+        backgroundImage: switch (credentials.user.image) {
+          final String image => CachedNetworkImageProvider(image),
           _ => null,
         },
-        child: switch (credentials.user.imageUrl) {
+        child: switch (credentials.user.image) {
           String _ => null,
           _ => _LoginUserListItemPlaceholder(credentials),
         },

sample_app/lib/login_screen/user_credentials.dart

@@ -12,7 +12,7 @@ class UserCredentials {
     user: const User(
       id: 'luke_skywalker',
       name: 'Luke Skywalker',
-      imageUrl:
+      image:
           'https://vignette.wikia.nocookie.net/starwars/images/2/20/LukeTLJ.jpg',
     ),
     token: DemoAppConfig.current.tokenForUser('luke_skywalker'),
@@ -22,7 +22,7 @@ class UserCredentials {
     user: const User(
       id: 'martin',
       name: 'Martin',
-      imageUrl:
+      image:
           'https://getstream.io/static/2796a305dd07651fcceb4721a94f4505/802d2/martin-mitrevski.webp',
     ),
     token: DemoAppConfig.current.tokenForUser('martin'),
@@ -32,7 +32,7 @@ class UserCredentials {
     user: const User(
       id: 'tommaso',
       name: 'Tommaso',
-      imageUrl:
+      image:
           'https://getstream.io/static/712bb5c0bd5ed8d3fa6e5842f6cfbeed/c59de/tommaso.webp',
     ),
     token: DemoAppConfig.current.tokenForUser('tommaso'),
@@ -42,7 +42,7 @@ class UserCredentials {
     user: const User(
       id: 'thierry',
       name: 'Thierry',
-      imageUrl:
+      image:
           'https://getstream.io/static/237f45f28690696ad8fff92726f45106/c59de/thierry.webp',
     ),
     token: DemoAppConfig.current.tokenForUser('thierry'),
@@ -52,7 +52,7 @@ class UserCredentials {
     user: const User(
       id: 'marcelo',
       name: 'Marcelo',
-      imageUrl:
+      image:
           'https://getstream.io/static/aaf5fb17dcfd0a3dd885f62bd21b325a/802d2/marcelo-pires.webp',
     ),
     token: DemoAppConfig.current.tokenForUser('marcelo'),