ci(linux): fix for ubunutu

.gitea/workflows/build-linux.yml

@@ -124,6 +124,16 @@ jobs:
           flutter --version
           command -v flutter_rust_bridge_codegen
 
+          # CRITICAL: use the apt-installed libclang (libclang-dev), NOT the
+          # LLVM 15.0.6 tarball at /opt/llvm-15.0.6 that the rest of the build
+          # uses. fr_bridge_codegen 1.80.1 emits broken Dart (stray
+          # `typedef bool = NativeFunction<...>`, unprefixed Int/Pointer in
+          # part files) when its internal ffigen runs against the tarball
+          # libclang. Upstream bridge.yml uses apt's libclang and the same
+          # codegen produces clean output. Don't pass --llvm-path either; let
+          # ffigen find libclang via system defaults.
+          unset LIBCLANG_PATH
+
           # 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.
@@ -134,7 +144,6 @@ jobs:
           # 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 \
             --dart-output ./flutter/lib/generated_bridge.dart \
             --c-output ./flutter/macos/Runner/bridge_generated.h

ci/runners/linux/provision.sh

@@ -81,6 +81,7 @@ apt-get update -qq
 apt-get install -y --no-install-recommends \
     build-essential clang gcc g++ cmake ninja-build pkg-config nasm yasm \
     autoconf automake libtool libtool-bin \
+    libclang-dev llvm-dev \
     libgtk-3-dev libayatana-appindicator3-dev \
     libasound2-dev libpulse-dev libpam0g-dev libssl-dev \
     libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev \