chore: add unawaited_futures lint as warning

mobile/analysis_options.yaml

@@ -17,7 +17,7 @@ linter:
   # section below to disable rules from the `package:flutter_lints/flutter.yaml`
   # included above or to enable additional rules. A list of all available lints
   # and their documentation is published at
-  # https://dart-lang.github.io/linter/lints/index.html.
+  # https://dart.dev/tools/linter-rules
   #
   # Instead of disabling a lint rule for the entire project in the
   # section below, it can also be suppressed for a single line of code
@@ -28,6 +28,7 @@ linter:
   rules:
     # avoid_print: false  # Uncomment to disable the `avoid_print` rule
     # prefer_single_quotes: true # Uncomment to enable the `prefer_single_quotes` rule
+    unawaited_futures: true
     use_build_context_synchronously: false
     require_trailing_commas: true
     unrelated_type_equality_checks: true
@@ -45,6 +46,9 @@ analyzer:
 
   plugins:
     - custom_lint
+  
+  errors:
+    unawaited_futures: warning
 
 custom_lint:
   debug: true