Adds a desktop: section to config.yaml so headless/VM users can make
`hermes desktop` launch correctly without a wrapper command:
- desktop.electron_flags: extra Electron CLI flags (e.g. --ozone-platform=x11)
appended to every launch. Accepts a list or a shell-split string.
- desktop.disable_gpu: auto|true|false, bridged to the HERMES_DESKTOP_DISABLE_GPU
env var the Electron app already reads. An explicit env var still wins.
cmd_gui() reads these via _desktop_launch_options() and applies them. This is
the config.yaml form of the capability proposed as a raw env var in #38934
(@1RB) — behavioral settings belong in config.yaml, not a new HERMES_* env var.
Co-authored-by: ray <86501179+1RB@users.noreply.github.com>
