The Hyprland gaps_out value (10px out of the box) reads well as a
window-to-window gap but felt cavernous when used as the screen-edge
margin for panels and notifications. Halve it at the source — panels
that anchor via PopupCard.margin, the launcher / clipboard / emojis /
polkit / menu / settings card-width clamps, and the notification popup
margins all read Style.gapsOut, so one tweak moves them in lockstep.
Revert the per-call /2 in the notifications service, since
Style.gapsOut now already encodes the smaller value.
Sit notifications closer to the top and right edges than the default
gapsOut. The bar-height clearance still applies to the top — only the
free gap portion is halved.
