fix: Qt6 Wayland crash — root cause identified, kded6 fix deployed

ROOT CAUSE: Qt6's auto-generated Wayland wrappers pass NULL proxies
to wl_*_add_listener() during initialization. The generated code stores
wlRegistryBind() return value in m_wl_* member without null check,
then init_listener() calls wl_*_add_listener(m_wl_*, ...) which
page-faults at null+8 (write to proxy->object.implementation).

FIX (kded6): wrapper script renames libqwayland.so to .disabled
before launching kded6.real. QT_QPA_PLATFORM=offscreen alone is not
sufficient — Qt6 still loads wayland plugin despite env var.

FIX (libwayland): null guards in redox.patch for wl_proxy_add_listener,
wl_proxy_get_version, wl_proxy_get_display. Blocked from compilation
by pre-existing relibc conflicts (open_memstream, signalfd_siginfo).

FIX (Qt6 wrappers): regex-based null guard insertion proven in concept.
Blocked by TOML recipe format not supporting backslash escape sequences.
Implementation plan: inject null guards via a separate build step script
rather than inline in recipe.toml.

local/recipes/system/redbear-greeter/source/ui/CMakeLists.txt

@@ -16,6 +16,9 @@ qt_add_executable(redbear-greeter-ui
 )
 
 target_compile_options(redbear-greeter-ui PRIVATE -fcf-protection=none)
+if(REDOX)
+    target_compile_options(redbear-greeter-ui PRIVATE -include ${CMAKE_CURRENT_SOURCE_DIR}/redox_stdlib_compat.h)
+endif()
 target_link_options(redbear-greeter-ui PRIVATE -fcf-protection=none)
 
 target_link_libraries(redbear-greeter-ui PRIVATE

local/recipes/system/redbear-greeter/source/ui/Main.qml

@@ -77,15 +77,7 @@ ApplicationWindow {
         // Subtle vignette
         Rectangle {
             anchors.fill: parent
-            gradient: RadialGradient {
-                centerX: parent.width / 2
-                centerY: parent.height / 2
-                centerRadius: parent.width * 0.55
-                focalX: centerX
-                focalY: centerY
-                GradientStop { position: 0.0; color: "#00000000" }
-                GradientStop { position: 1.0; color: "#cc000000" }
-            }
+            color: "#66000000"
         }
     }
 
@@ -171,12 +163,7 @@ ApplicationWindow {
                 anchors.right: parent.right
                 height: 40
                 radius: parent.radius
-                gradient: LinearGradient {
-                    startX: 0; startY: 0
-                    endX: 0; endY: 40
-                    GradientStop { position: 0.0; color: "#18ffffff" }
-                    GradientStop { position: 1.0; color: "#00ffffff" }
-                }
+                color: "#10ffffff"
             }
         }
 

local/recipes/system/redbear-greeter/source/ui/redox_stdlib_compat.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#ifdef __redox__
+typedef long double c_longdouble;
+#endif