feat(uwsm): pin Hyprland to AMD iGPU via AQ_DRM_DEVICES

dot_config/uwsm/env-hyprland

@@ -0,0 +1,9 @@
+# Sourced by uwsm before Hyprland starts.
+# Keep Hyprland on the AMD iGPU (Radeon 8060S, PCI c4:00.0). The Thunderbolt
+# eGPU (RTX 5060 Ti) drives no displays and is for compute only; without this,
+# aquamarine opens it as a second KMS device. cardN numbering shifts with eGPU
+# hotplug timing, so resolve the stable by-path link. Left unset if missing so
+# Hyprland still falls back to auto-detection.
+igpu=$(readlink -f /dev/dri/by-path/pci-0000:c4:00.0-card 2>/dev/null)
+[ -e "$igpu" ] && export AQ_DRM_DEVICES="$igpu"
+unset igpu