chatgui: Ninja + parallel build for Windows speedup

tools/chatgui/build.sh

@@ -19,12 +19,13 @@ log "Build:   $BUILD_DIR"
 log ""
 
 log "[1/4] Configuring CMake..."
-cmake -S "$SRC_DIR" -B "$BUILD_DIR" -G "MSYS Makefiles" 2>&1 | tee -a "$LOG_FILE"
+cmake -S "$SRC_DIR" -B "$BUILD_DIR" -G Ninja 2>&1 | tee -a "$LOG_FILE"
 test ${PIPESTATUS[0]} -eq 0 || { log "CMake configure FAILED"; exit 1; }
 
 log ""
-log "[2/4] Building..."
-cmake --build "$BUILD_DIR" 2>&1 | tee -a "$LOG_FILE"
+JOBS=$(nproc 2>/dev/null || echo 4)
+log "[2/4] Building (parallel: $JOBS jobs)..."
+cmake --build "$BUILD_DIR" -j"$JOBS" 2>&1 | tee -a "$LOG_FILE"
 test ${PIPESTATUS[0]} -eq 0 || { log "Build FAILED"; exit 1; }
 
 log ""