Backfill pre-quattro hardware support and tmux fixes for existing installs

Existing quattro installs get sof-firmware, the Mesa Vulkan drivers,
the tmux terminal-features and pane-binding fixes, and the XPS 13 text
scaling via migration, while Omarchy 4 upgraders get the same hardware
support and scaling through omarchy-upgrade-to-quattro.

The Vulkan driver backfill adapts da46ad85 from master.

Co-authored-by: Sai Sridhar <tarrasridhar1154@gmail.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/shell.d/upgrade-to-quattro-test.sh

@@ -55,3 +55,10 @@ pass "Omarchy 4 upgrade retires systemd-networkd for NetworkManager"
 
 grep -F 'omarchy-bar defaults' "$upgrade_to_quattro" >/dev/null
 pass "Omarchy 4 upgrade restores service-aware bar defaults"
+
+grep -F 'install_hardware_transition_packages' "$upgrade_to_quattro" >/dev/null
+grep -F 'sof-firmware' "$upgrade_to_quattro" >/dev/null
+grep -F 'vulkan-intel' "$upgrade_to_quattro" >/dev/null
+grep -F 'apply_user_hardware_transition' "$upgrade_to_quattro" >/dev/null
+grep -F 'DX13260' "$upgrade_to_quattro" >/dev/null
+pass "Omarchy 4 upgrade backfills hardware support from the legacy release"