feat(effects): implement iOS 26 Liquid Glass effect with reusable components

Add GlassEffect.qml, a pure ShaderEffect item with GLSL liquid-glass
shader: rounded-rect SDF, edge refraction, RGB dispersion, specular
highlight, SDF-derivative AA. Register shaders via qt_add_shaders.

新增 GlassEffect.qml 组件，含 GLSL 液态玻璃着色器：圆角矩形 SDF、
边缘折射、RGB 色差、镜面高光、SDF 导数抗锯齿，通过 qt_add_shaders 注册。

Add dconfig keys for glass/blur effect switch and blur strength. Add
highlight dconfig switch; remove unused props highlightStrength,
shaderLog, radiusEnabled alias.

新增 dconfig 配置项：glass/blur 效果开关和 blur 强度，高光开关，
移除未使用属性 highlightStrength、shaderLog、radiusEnabled。

BlitTextureProvider maps smooth to setFiltering, antialiasing to
setAnisotropyLevel. Fix corner white artifacts via premultiplied alpha
output. Unify light direction via lightAngle.

BlitTextureProvider 将 smooth 映射 setFiltering，antialiasing 映射
setAnisotropyLevel。修复圆角白色伪影（预乘 alpha 输出），统一光线方向。

test_glass standalone demo uses SHARED treeland_stub library providing
a minimal Treeland QML module (Helper singleton + GlassConfig defaults)
so Blur.qml / RoundBlur.qml work without libtreeland.

test_glass 示例使用 SHARED treeland_stub 库提供最小 Treeland QML 模块
（Helper 单例 + GlassConfig 默认值），无需链接 libtreeland 即可运行。

RoundBlur: glassEnabled=false, pure blur at blurMax=64, color property
restored. Remove non-existent color property from lockscreen QML.

RoundBlur 设 glassEnabled=false，纯 blur（blurMax=64），恢复 color 属性，
移除锁屏 QML 中对不存在 color 属性的引用。

test_effect_glass: 14 tests covering GlassEffect properties and shader
output.

test_effect_glass 含 14 个测试，覆盖 GlassEffect 属性和着色器输出。

Log: 实现iOS 26 Liquid Glass效果，可复用组件和dconfig配置
Influence: 新增玻璃效果开关和材质参数配置，锁屏模糊效果由RoundBlur统一控制

Author: zccrs

examples/CMakeLists.txt

@@ -27,3 +27,4 @@ add_subdirectory(test_im_candidate_panel_tag)
 add_subdirectory(test_im_candidate_panel_xprop)
 add_subdirectory(test_input_manager)
 add_subdirectory(test_keyboard_state_notify)
+add_subdirectory(test_glass)

examples/test_glass/CMakeLists.txt

@@ -0,0 +1,99 @@
+# Copyright (C) 2026 UnionTech Software Technology Co., Ltd.
+# SPDX-License-Identifier: Apache-2.0 OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+find_package(Qt6 COMPONENTS Quick QuickControls2 ShaderTools REQUIRED)
+qt_standard_project_setup(REQUIRES 6.4)
+
+if(QT_KNOWN_POLICY_QTP0001) # this policy was introduced in Qt 6.5
+    qt_policy(SET QTP0001 NEW)
+    # the RESOURCE_PREFIX argument for qt_add_qml_module() defaults to ":/qt/qml/"
+endif()
+if(POLICY CMP0071)
+    # https://cmake.org/cmake/help/latest/policy/CMP0071.html
+    cmake_policy(SET CMP0071 NEW)
+endif()
+
+set(QML_IMPORT_PATH "${PROJECT_BINARY_DIR}/src/server;${QML_IMPORT_PATH}" CACHE STRING "For LSP" FORCE)
+
+find_package(PkgConfig REQUIRED)
+pkg_search_module(PIXMAN REQUIRED IMPORTED_TARGET pixman-1)
+pkg_search_module(WAYLAND REQUIRED IMPORTED_TARGET wayland-server)
+
+set(GLASS_LIQUIDGLASS_SHADER_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../misc/shaders")
+set(GLASS_EFFECT_QML "${CMAKE_CURRENT_SOURCE_DIR}/../../src/core/qml/Effects/GlassEffect.qml")
+set(GLASS_BLUR_QML "${CMAKE_CURRENT_SOURCE_DIR}/../../src/core/qml/Effects/Blur.qml")
+set(LOCKSCREEN_ROUNDBLUR_QML "${CMAKE_CURRENT_SOURCE_DIR}/../../src/plugins/lockscreen/qml/RoundBlur.qml")
+set_source_files_properties(${GLASS_EFFECT_QML}
+    PROPERTIES
+        QT_RESOURCE_ALIAS "GlassEffect.qml"
+)
+set_source_files_properties(${GLASS_BLUR_QML}
+    PROPERTIES
+        QT_RESOURCE_ALIAS "Blur.qml"
+)
+set_source_files_properties(${LOCKSCREEN_ROUNDBLUR_QML}
+    PROPERTIES
+        QT_RESOURCE_ALIAS "RoundBlur.qml"
+)
+
+# ── Stub Treeland QML module ─────────────────────────────────────────────
+# Provides a minimal Helper singleton with default-valued glass config so
+# the upstream Blur.qml / RoundBlur.qml — which read `Helper.config.*` and
+# `import Treeland` — work inside the standalone demo without libtreeland.
+qt_add_library(treeland_stub SHARED)
+qt_add_qml_module(treeland_stub
+    URI Treeland
+    VERSION "2.0"
+    QML_FILES
+        ${GLASS_EFFECT_QML}
+        ${GLASS_BLUR_QML}
+        ${LOCKSCREEN_ROUNDBLUR_QML}
+    SOURCES
+        helper.h
+        helper.cpp
+)
+qt_add_shaders(treeland_stub "treeland_stub_liquidglass_shaders"
+    PRECOMPILE
+    PREFIX
+        "/shaders"
+    BASE
+        ${GLASS_LIQUIDGLASS_SHADER_DIR}
+    FILES
+        ${GLASS_LIQUIDGLASS_SHADER_DIR}/liquidglass.vert
+        ${GLASS_LIQUIDGLASS_SHADER_DIR}/liquidglass.frag
+)
+target_compile_definitions(treeland_stub PRIVATE WLR_USE_UNSTABLE)
+target_link_libraries(treeland_stub PUBLIC
+    Qt6::Quick
+    waylibserver
+    PkgConfig::PIXMAN
+    PkgConfig::WAYLAND
+)
+
+# ── test_glass executable ────────────────────────────────────────────────
+add_executable(test_glass
+    main.cpp
+)
+qt_add_qml_module(test_glass
+    URI GlassExample
+    VERSION "1.0"
+    QML_FILES
+        Main.qml
+    RESOURCES
+        assets/default-glass-background.jpg
+)
+target_compile_definitions(test_glass
+    PRIVATE
+    SOURCE_DIR="${CMAKE_CURRENT_SOURCE_DIR}"
+    $<$<BOOL:${START_DEMO}>:START_DEMO>
+    WLR_USE_UNSTABLE
+)
+target_link_libraries(test_glass
+    PRIVATE
+    Qt6::Quick
+    Qt6::QuickControls2
+    treeland_stub
+    PkgConfig::PIXMAN
+    PkgConfig::WAYLAND
+)
+install(TARGETS test_glass DESTINATION ${CMAKE_INSTALL_BINDIR})