ci(smoke): fix the mpd / hardware / leak tiers so they actually run

The first run went green but the best-effort tiers silently didn't exercise
anything:

- state.sh: the mpd `audio_output { ... }` block was on one line, which mpd
  rejects ("Unknown tokens after '{'"), so mpd never started and the mpd
  sub-tier (the #5183 empty-queue repro) skipped. Split the block across lines.
  Also move teardown into a cleanup() with `|| true` so a dead-pid kill under
  `set -e` no longer makes the step exit 1.
- hardware.sh: umockdev-run's LD_PRELOAD lands ahead of the linked-in ASan
  runtime, so ASan aborted before main() ("ASan runtime does not come first")
  and waybar never started -- the backlight/slider (#5179) path wasn't tested.
  Set verify_asan_link_order=0 so the instrumented binary runs under the preload.
- leakcheck.sh: abort_on_error=1 turned LSan's exit report into a core dump;
  force abort_on_error=0 for this report-only tier.
- lib.sh: assert_clean now also flags "ASan runtime does not come first" so a
  future preload/link-order regression fails loudly instead of passing.

test/smoke/state.sh

@@ -15,14 +15,21 @@ DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 # shellcheck source=lib.sh
 source "$DIR/lib.sh"
 
-smoke::setup
-smoke::start_compositor
-trap 'smoke::stop; [ -n "${MPD_PID:-}" ] && kill "$MPD_PID" 2>/dev/null; [ -n "${PA_STARTED:-}" ] && pulseaudio --kill 2>/dev/null; true' EXIT
-
 fail=0
 MPD_PID=""
 PA_STARTED=""
 
+cleanup() {
+    smoke::stop
+    [ -n "$MPD_PID" ] && kill "$MPD_PID" 2>/dev/null || true
+    [ -n "$PA_STARTED" ] && pulseaudio --kill 2>/dev/null || true
+    return 0
+}
+
+smoke::setup
+smoke::start_compositor
+trap cleanup EXIT
+
 # ---------------------------------------------------------------- mpd -----
 mpd_tier() {
     if ! command -v mpd >/dev/null || ! command -v mpc >/dev/null; then
@@ -39,7 +46,10 @@ state_file "$d/state"
 pid_file "$d/pid"
 bind_to_address "127.0.0.1"
 port "6600"
-audio_output { type "null" name "null" }
+audio_output {
+    type "null"
+    name "null"
+}
 EOF
     mpd --no-daemon "$conf" >/tmp/mpd.log 2>&1 &
     MPD_PID=$!