switched to flutter_riverpod for state/page management.

mobile/app/pubspec.lock

@@ -326,6 +326,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.20"
+  flutter_riverpod:
+    dependency: "direct main"
+    description:
+      name: flutter_riverpod
+      sha256: "0f1974eff5bbe774bf1d870e406fc6f29e3d6f1c46bd9c58e7172ff68a785d7d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.1"
   flutter_shaders:
     dependency: transitive
     description:
@@ -800,6 +808,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.2.8"
+  riverpod:
+    dependency: transitive
+    description:
+      name: riverpod
+      sha256: f21b32ffd26a36555e501b04f4a5dca43ed59e16343f1a30c13632b2351dfa4d
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.1"
   rxdart:
     dependency: transitive
     description:
@@ -933,6 +949,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.11.1"
+  state_notifier:
+    dependency: transitive
+    description:
+      name: state_notifier
+      sha256: b8677376aa54f2d7c58280d5a007f9e8774f1968d1fb1c096adcb4792fba29bb
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
   stop_watch_timer:
     dependency: transitive
     description: