hyprland: actually enable the floating-window snap (the previous commit

ended up just toggling blur back on)

Adds the general.snap block — alignment snap to screen edges and other
floating windows with a 10px gap.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

settings/hyprland.nix

@@ -113,6 +113,15 @@
             border_size = 2;
             layout = "dwindle";
             resize_on_border = true;
+
+            # Snap floating windows when dragged near each other or screen
+            # edges. Alignment-snap only — not Aero-style "drag to top to
+            # maximize".
+            snap = {
+              enabled = true;
+              window_gap = 10;
+              monitor_gap = 10;
+            };
           };
 
           decoration = {