* Enable middle-click primary paste for GTK/Chromium apps
gsettings-desktop-schemas 50.x ships gtk-enable-primary-paste=false as
the default. GTK4 apps (Ghostty 1.3.0+) and Chromium-family browsers
honor that setting and silently no-op middle-click paste, even though
the primary selection itself works (wl-paste --primary returns text,
Firefox/LibreOffice paste fine because they implement primary paste
themselves rather than going through GTK).
Flip the GSetting to true so middle-click paste behaves the way Linux
desktop users expect across Ghostty, Brave, and Chromium.
Closes#5371
* Address Copilot review on #5577
Move install-time GSetting from install/config/ to install/first-run/
so it runs after login when a session D-Bus is guaranteed (matching the
existing gnome-theme.sh convention). Make the migration's gsettings
call best-effort with `|| true` so a missing dconf service doesn't
trigger the omarchy-migrate skip prompt.
David Heinemeier Hansson