fix(tauri): add CEF GPU-disable startup override (#4309)

Co-authored-by: Sami Rusani <sr@samirusani>
Co-authored-by: M3gA-Mind <megamind@mahadao.com>

.env.example

@@ -130,6 +130,12 @@ OPENHUMAN_REASONING_ENABLED=
 # shell tool spawns child processes (CREATE_NO_WINDOW). Default: false.
 # Equivalent TOML: [shell] hide_window = true
 OPENHUMAN_SHELL_HIDE_WINDOW=
+# [optional] Desktop CEF startup escape hatch. Set to 1/true/yes/on only when
+# CEF fails before the app can render, for example on a GPU/driver stack where
+# startup logs show `cef::initialize returned 0`. Adds --disable-gpu and
+# --disable-gpu-compositing to the embedded CEF runtime. Leave unset otherwise;
+# this disables GPU acceleration and can break WebGL-heavy surfaces.
+# OPENHUMAN_DISABLE_GPU=
 
 # ---------------------------------------------------------------------------
 # Web search