WebKitGTK's accelerated GL compositor crashes with a SIGSEGV inside
g_application_run on some Intel setups, hitting Mesa anv/i965 code paths
for DRM format modifiers that aren't implemented (FINISHME: YUV
colorspace / multi-planar formats). Disabling the DMA-BUF renderer alone
doesn't cover the GL compositor, so the crash survived that workaround.
Set WEBKIT_DISABLE_COMPOSITING_MODE=1 in init() (skipped if the user
already set it) to force CPU rendering, which is fine for a UI this
small and sidesteps the broken modifier path.
WebKitGTK crashes at startup when its bubblewrap sandbox can't create an
unprivileged user namespace (bwrap: setting up uid map: Permission denied
-> Failed to fully launch dbus-proxy -> panic in webkit_web_view_load_uri).
This happens in containers/VMs and on Ubuntu 24.04+ where AppArmor
restricts unprivileged user namespaces. Detect that the kernel blocks
userns via procfs and set WEBKIT_DISABLE_SANDBOX_THIS_IS_DANGEROUS so the
UI stays usable; honor an explicit user override either way.
Removes the legacy fyne-based client/ui implementation and renames the
Wails replacement (client/ui-wails) to take its place at client/ui. Go
imports, frontend bindings, CI workflows, goreleaser configs and the
windows .syso icon path are updated to follow the rename.
