Ghostty's stylesheets (style.css, style-dark.css, style-hc*.css) were
never loaded. AdwApplication loads them from `resource-base-path` once,
during startup, and only if the resources exist at that moment. Zig's
gresource is registered by a glib-compile-resources C constructor before
main; the Rust build registered it lazily on first template instantiation
(windows, dialogs), i.e. after startup.
Visible effect: every rule in style.css was missing, e.g. the clipboard
confirmation dialog (`clipboard-read = ask`) rendered its preview without
the rounded inset and overlapping the "Remember choice" row.
Registering in Application::new restores parity; the Adwaita
"style-dark.css is deprecated" warnings Zig logs now appear too, which
confirms the files are picked up.
Test Plan:
- clipboard-read = ask, run `printf '\e]52;c;?\a'`: dialog is
pixel-identical to Ghostty 1.3.1 (nested weston capture)
ddidderr
87dde3fafa