feat: Qt6 Sensors v6.11.0 — builds on Redox, pkgar in repo

- Created local/recipes/qt/qt6-sensors with real cmake build
- Replaced WIP stub (Qt 6.6.1) with Qt 6.11.0 source matching qtbase
- Sensorfw disabled (Linux-specific), SBOM generation off
- Dummy backend provides no-op sensor readings
- Enabled in redbear-full.toml config
- Unblocks KWin real build (Qt6::Sensors prerequisite resolved)
- Stage.pkgar: 520KB in repo

local/recipes/qt/qt6-sensors/recipe.toml

@@ -0,0 +1,46 @@
+#TODO: Qt6 Sensors — minimal build with dummy backend for Red Bear OS.
+# Provides Qt6::Sensors cmake target needed by KWin.
+# Sensorfw disabled (Linux-specific). Dummy plugin provides no-op sensor readings.
+[source]
+tar = "https://download.qt.io/official_releases/qt/6.11/6.11.0/submodules/qtsensors-everywhere-src-6.11.0.tar.xz"
+
+[build]
+template = "custom"
+dependencies = [
+    "qtbase",
+    "qtdeclarative",
+]
+script = """
+DYNAMIC_INIT
+
+HOST_BUILD="${COOKBOOK_ROOT}/build/qt-host-build"
+
+for qtdir in plugins mkspecs metatypes modules; do
+    if [ -d "${COOKBOOK_SYSROOT}/usr/${qtdir}" ] && [ ! -e "${COOKBOOK_SYSROOT}/${qtdir}" ]; then
+        ln -s "usr/${qtdir}" "${COOKBOOK_SYSROOT}/${qtdir}"
+    fi
+done
+
+rm -f CMakeCache.txt
+rm -rf CMakeFiles
+
+cmake "${COOKBOOK_SOURCE}" \
+    -DCMAKE_TOOLCHAIN_FILE="${COOKBOOK_ROOT}/local/recipes/qt/redox-toolchain.cmake" \
+    -DQT_HOST_PATH="${HOST_BUILD}" \
+    -DCMAKE_INSTALL_PREFIX=/usr \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_PREFIX_PATH="${COOKBOOK_SYSROOT}" \
+    -DBUILD_TESTING=OFF \
+    -DBUILD_EXAMPLES=OFF \
+    -DFEATURE_sensorfw=OFF \
+    -DQT_GENERATE_SBOM=OFF \
+    -Wno-dev
+
+cmake --build . -j${COOKBOOK_MAKE_JOBS}
+cmake --install . --prefix "${COOKBOOK_STAGE}/usr"
+
+for lib in "${COOKBOOK_STAGE}/usr/lib/"libQt6Sensors*.so.*; do
+    [ -f "${lib}" ] || continue
+    patchelf --remove-rpath "${lib}" 2>/dev/null || true
+done
+"""