ci(linux): keep extended_text downgrade until after bridge codegen completes

.gitea/workflows/build-linux.yml

@@ -124,13 +124,15 @@ jobs:
           flutter --version
           command -v flutter_rust_bridge_codegen
 
-          # extended_text 14.0.0 requires Flutter 3.24+. Downgrade to 13.0.0 for
-          # the bridge-gen pub get under 3.22.3. Mirrors upstream bridge.yml.
-          (cd flutter && \
-              sed -i -e 's/extended_text: 14.0.0/extended_text: 13.0.0/g' pubspec.yaml && \
-              flutter pub get && \
-              git checkout -- pubspec.yaml)
+          # extended_text 14.0.0 requires Dart >=3.5 (Flutter 3.24+). Flutter
+          # 3.22.3 has Dart 3.4.4, so downgrade to 13.0.0 for the duration of
+          # bridge generation. Mirrors upstream bridge.yml.
+          (cd flutter && sed -i -e 's/extended_text: 14.0.0/extended_text: 13.0.0/g' pubspec.yaml)
+          (cd flutter && flutter pub get)
 
+          # flutter_rust_bridge_codegen invokes `flutter pub run ffigen`
+          # internally, which re-validates pubspec.yaml -- so pubspec.yaml must
+          # still be the downgraded version when this runs.
           flutter_rust_bridge_codegen \
             --llvm-path "$LLVM_HOME" \
             --rust-input ./src/flutter_ffi.rs \
@@ -138,10 +140,10 @@ jobs:
             --c-output ./flutter/macos/Runner/bridge_generated.h
           cp ./flutter/macos/Runner/bridge_generated.h ./flutter/ios/Runner/bridge_generated.h
 
-          # Re-resolve packages with the build SDK (3.24.5) so pubspec.lock has
-          # the correct entries for the final build. The generated_bridge files
-          # produced under 3.22.3 above stay on disk -- they're plain Dart and
-          # remain compatible with 3.24.5's compiler.
+          # Now bridge gen is done. Restore the original pubspec.yaml and
+          # re-resolve under the build SDK (3.24.5) so pubspec.lock has the
+          # correct entries for the final flutter build linux step.
+          (cd flutter && git checkout -- pubspec.yaml)
           (cd flutter && /opt/flutter/bin/flutter pub get)
 
       - name: vcpkg install dependencies (x64-linux)