fix(sherpa-native): Android build fails — HappierSherpaNativeJni.cpp missing #include <vector> (NDK 27 libc++)

[danljungstrom]

Summary

The nightly Android APK build has failed every run since ~2026-06-21. The UI mobile (dev) / publish job in NIGHTLY — Dev Releases dies at the native C++ compile step, so no new happier-dev-android.apk has shipped in ~3.5 weeks (last successful asset: ui-mobile-dev @ 2026-06-21, version 0.2.7). All other components (server/cli/hstack/ui-web/desktop/docker) publish fine, so the overall nightly run is marked failed but the breakage is mobile-only.

Error

packages/sherpa-native/android/src/main/cpp/HappierSherpaNativeJni.cpp:202:24:
  error: implicit instantiation of undefined template 'std::vector<float>'
  note: template is declared here  (…/c++/v1/iosfwd:168)
HappierSherpaNativeJni.cpp:210 / :393  — same for std::vector<float> / std::vector<int16_t>
5 errors generated.
ninja: build stopped: subcommand failed.
C++ build system [build] failed … happier_sherpa_jni … arm64-v8a
BUILD FAILED
> npx eas-cli@18.0.1 build --platform android --profile publicdev-apk --local … exit 1

Toolchain: ndk/27.0.12077973, cmake 3.22.1, EAS local build via Dagger.

Root cause

HappierSherpaNativeJni.cpp uses std::vector<float> and std::vector<int16_t> but never includes <vector> (nor <cstdint> for int16_t). Current includes: <jni.h> <atomic> <mutex> <string> <unordered_map> <memory> + sherpa-onnx/c-api.h. It was relying on <vector> being pulled in transitively. NDK 27's libc++ tightened its headers (only a forward decl from <iosfwd> is now visible), so the transitive include vanished.

Latent bug, not a code change: the file has a single commit (bc1d1819, 2026-02-15, never modified). The break coincides with the CI build image / NDK bump to 27 — nothing in the app repo changed.

Fix

Add the missing includes to HappierSherpaNativeJni.cpp:

#include <vector>
#include <cstdint>

Follow-ups worth considering

• Grep other native modules (audio-stream-native, etc.) for the same latent transitive-include reliance under NDK 27.
• Make the UI mobile (dev) / publish failure page/alert — it silently failed for 3.5 weeks because the other components kept publishing and masked the red run.