fix(mobile): pin phosphor_flutter to a fork that handles sealed IconData

phosphor_flutter 2.1.0 (the latest on pub.dev, May 2024) extends
Flutter's `IconData`, which 3.43+ sealed as `final`. Building against
Flutter 3.44 fails the kernel_snapshot Dart AOT step with:

  phosphor_icon_data.dart:5:32: Error: The class 'IconData' can't be
  extended outside of its library because it's a final class.
  class PhosphorIconData extends IconData {

Upstream PR #62 turns PhosphorIconData into a typedef for IconData but
has been open with no maintainer response since May 2026, and the
package's last release is from May 2024 — effectively unmaintained.

Pin phosphor_flutter to the PR author's fork at a specific commit SHA
via dependency_overrides so the lockfile stays reproducible. None of
the removed classes (PhosphorFlatIconData, PhosphorDuotoneIconData)
are referenced by the app — only PhosphorIcon, PhosphorIconsDuotone,
and duotoneSecondaryColor, all of which the fork keeps API-compatible.

Drop the override when upstream publishes a fixed version (or when we
migrate to a maintained icon library).

  phosphor-icons/flutter#61
  phosphor-icons/flutter#62

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Comm4nd0

mobile/pubspec.lock

@@ -763,10 +763,11 @@ packages:
   phosphor_flutter:
     dependency: "direct main"
     description:
-      name: phosphor_flutter
-      sha256: "8a14f238f28a0b54842c5a4dc20676598dd4811fcba284ed828bd5a262c11fde"
-      url: "https://pub.dev"
-    source: hosted
+      path: "."
+      ref: "514f0a883571c4453dbd6ee3041d1dcba4fb8fc7"
+      resolved-ref: "514f0a883571c4453dbd6ee3041d1dcba4fb8fc7"
+      url: "https://github.com/subarnaPdl/phosphor_icons.git"
+    source: git
     version: "2.1.0"
   platform:
     dependency: transitive

mobile/pubspec.yaml

@@ -36,6 +36,21 @@ dev_dependencies:
   flutter_launcher_icons: ^0.13.1
   flutter_native_splash: ^2.4.0
 
+# phosphor_flutter 2.1.0 (the latest on pub.dev as of May 2026) extends
+# Flutter's `IconData`, which was sealed `final` in Flutter 3.43. The
+# package is effectively unmaintained — upstream PR #62 with the fix has
+# been open since May 2026 with no maintainer response. Pin to the PR
+# author's fork at a specific commit so the lockfile is reproducible.
+# When upstream finally publishes a fix (or we migrate to a different
+# icon library), drop this override.
+#   https://github.com/phosphor-icons/flutter/issues/61
+#   https://github.com/phosphor-icons/flutter/pull/62
+dependency_overrides:
+  phosphor_flutter:
+    git:
+      url: https://github.com/subarnaPdl/phosphor_icons.git
+      ref: 514f0a883571c4453dbd6ee3041d1dcba4fb8fc7
+
 flutter:
   uses-material-design: true
   # Flutter 3.44 auto-enables Swift Package Manager and tries to add the