refactor(mobile): build context extensions (#4923)

* refactor: move all extensions to separate package

* refactor(mobile): add BuildContext extension

* refactor(mobile): use theme getters from context

* refactor(mobile): use media query size from context

* refactor(mobile): use auto router methods from context

* refactor(mobile): use navigator methods from context

---------

Co-authored-by: shalong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

mobile/lib/extensions/string_extensions.dart

@@ -0,0 +1,30 @@
+extension StringExtension on String {
+  String capitalize() {
+    return split(" ")
+        .map(
+          (str) => str.isEmpty ? str : str[0].toUpperCase() + str.substring(1),
+        )
+        .join(" ");
+  }
+}
+
+extension DurationExtension on String {
+  Duration? toDuration() {
+    try {
+      final parts = split(':')
+          .map((e) => double.parse(e).toInt())
+          .toList(growable: false);
+      return Duration(hours: parts[0], minutes: parts[1], seconds: parts[2]);
+    } catch (e) {
+      return null;
+    }
+  }
+
+  double toDouble() {
+    return double.parse(this);
+  }
+
+  int toInt() {
+    return int.parse(this);
+  }
+}