Enable Dell XPS 13 sidecar speaker amplifiers (#7032)

The Dell XPS 13 DX13260 drives its two CS35L56 sidecar speaker amplifiers through a quirk that Linux only gains in 7.2, so until Arch ships that kernel the machine plays through one amplifier with no bass. The dell-xps13-sidecar-amps package selects the same driver path with a module override; this installs it on that exact machine and nowhere else.

The detector requires both the DX13260 product name and SKU 0E53, because the override forces a quirk value rather than merging into one, and a machine that gets it wrong loses whatever quirk the kernel would have chosen for itself.

Pacman registers a package even when its post_install scriptlet fails, so the leaf calls dell-xps13-sidecar-amps-apply itself instead of trusting the install to have applied: a failed cleanup or boot-image rebuild has to reach the caller rather than hide behind a package pacman considers installed. That is also why the migration marks reboot-required only after the apply succeeds — a migration that exits non-zero keeps no completion marker and retries the apply on the next run, even though pacman already has the package.

The leaf runs after intel/ptl-kernel.sh rather than beside the other Dell leaf at the top of install/hardware/all.sh, so its boot-image rebuild sees the Panther Lake kernel that step swaps in rather than the stock one it removes.

Co-authored-by: Codex XHigh <codex@openai.com>

bin/omarchy-hw-dell-xps13-sidecar-amps

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# omarchy:summary=Match the Dell XPS 13 DX13260 that requires the sidecar amplifier workaround.
+
+product_sku="${OMARCHY_DMI_PRODUCT_SKU:-/sys/class/dmi/id/product_sku}"
+
+omarchy-hw-match "DX13260" &&
+  grep -qix "0E53" "$product_sku" 2>/dev/null