feat: integrate awesome_lints and upgrade to Flutter 3.38 (#1173)

* chore: update Flutter SDK to version 3.38.5

Upgrade Flutter from 3.32.4 to 3.38.5 to meet awesome_lints
requirement for Dart SDK 3.10.0+. Update CI workflow to use
the new Flutter version and add custom_lint verification step.

* chore: integrate awesome_lints with custom lint rules

Add awesome_lints and custom_lint dependencies, configure
analysis_options.yaml to enable newline lint rules: newline_before_case,
newline_before_constructor, newline_before_method, and newline_before_return.

* style: apply newline formatting per awesome_lints rules

Add blank lines before case clauses, return statements, method
declarations, and constructors throughout the codebase to comply
with awesome_lints newline rules.

* fix: replace deprecated translate with leftTranslateByDouble

Update Matrix4.translate() calls to use the new leftTranslateByDouble()
API to resolve deprecation warnings in Flutter SDK 3.38.5.

* chore: improve code readability with blank line formatting

analysis_options.yaml

@@ -11,4 +11,14 @@ linter:
 
 analyzer:
   exclude:
-    - lib/src/l10n/**
+    - lib/src/l10n/**
+  plugins:
+    - custom_lint
+
+custom_lint:
+  enable_all_lint_rules: false
+  rules:
+    - newline_before_case
+    - newline_before_constructor
+    - newline_before_method
+    - newline_before_return