Nudge XPS 13 text scaling down just ever so slightly

The 2560x1600 panel on the 2026 XPS 13 (DX13260) renders the default
scaling a touch large. Ports f1fa7f69 from master.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

install/user/hardware/dell/xps13-text-scaling.sh

@@ -0,0 +1,5 @@
+# Nudge text down slightly on the Dell XPS 13 (DX13260, 2026), whose 2560x1600
+# panel renders the default scaling a touch large.
+if omarchy-hw-match "DX13260"; then
+  gsettings set org.gnome.desktop.interface text-scaling-factor 0.95
+fi