Force software cursors on nouveau

Adapt the fix from PR #6161 to Quattro's per-user hardware setup and add coverage for detection, idempotency, and proprietary-driver handling.

test/shell.d/nouveau-cursor-test.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+set -euo pipefail
+
+source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
+
+test_tmp=$(mktemp -d)
+trap 'rm -rf "$test_tmp"' EXIT
+
+mkdir -p "$test_tmp/bin" "$test_tmp/home/.config/hypr"
+cat >"$test_tmp/bin/lspci" <<'SH'
+#!/bin/bash
+printf '%s\n' "Kernel driver in use: ${TEST_VIDEO_DRIVER:-nouveau}"
+SH
+chmod +x "$test_tmp/bin/lspci"
+
+looknfeel="$test_tmp/home/.config/hypr/looknfeel.lua"
+printf '%s\n' '-- User look and feel' >"$looknfeel"
+
+run_fix() {
+  HOME="$test_tmp/home" \
+    PATH="$test_tmp/bin:$ROOT/bin:$PATH" \
+    OMARCHY_NVIDIA_MODPROBE_CONFIG="$test_tmp/nvidia.conf" \
+    TEST_VIDEO_DRIVER="${1:-nouveau}" \
+    bash -euo pipefail -c 'source "$ROOT/install/user/hardware/fix-nouveau-cursor.sh"'
+}
+
+run_fix >/dev/null
+grep -F 'no_hardware_cursors = true' "$looknfeel" >/dev/null
+pass "nouveau hardware setup enables software cursors"
+
+run_fix >/dev/null
+(( $(grep -c 'no_hardware_cursors = true' "$looknfeel") == 1 )) || fail "nouveau cursor setup is idempotent"
+pass "nouveau cursor setup is idempotent"
+
+printf '%s\n' '-- User look and feel' >"$looknfeel"
+run_fix i915 >/dev/null
+if grep -q 'no_hardware_cursors' "$looknfeel"; then
+  fail "nouveau cursor setup ignores other video drivers"
+fi
+pass "nouveau cursor setup ignores other video drivers"
+
+touch "$test_tmp/nvidia.conf"
+run_fix >/dev/null
+if grep -q 'no_hardware_cursors' "$looknfeel"; then
+  fail "nouveau cursor setup skips proprietary NVIDIA installs"
+fi
+pass "nouveau cursor setup skips proprietary NVIDIA installs"