Fix niri live ISO audio and dark theme setup

iso/_inner-build-niri-live.sh

@@ -31,6 +31,28 @@ command -v xbps-install.static >/dev/null \
 
 mkdir -p "$(dirname "$OUT_ISO")"
 
+# Compile dconf system-db using Void's own dconf binary inside the target
+# rootfs. The Niri live builder writes /etc/dconf/db/local.d/01-dark-theme,
+# but the live system will not report the dark theme unless the GVDB is
+# compiled into /etc/dconf/db/local (and into skel for the live user).
+_DCONF_POSTSETUP="$(mktemp -p "$MKLIVE_DIR" postsetup-dconf.XXXXX.sh)"
+cat > "$_DCONF_POSTSETUP" <<'PSEOF'
+#!/bin/bash
+ROOTFS="$1"
+if [[ -x "$ROOTFS/usr/bin/dconf" ]] && [[ -d "$ROOTFS/etc/dconf/db/local.d" ]]; then
+    chroot "$ROOTFS" dconf compile /etc/dconf/db/local /etc/dconf/db/local.d \
+        && echo "postsetup: system-db compiled ($(chroot "$ROOTFS" dconf --version 2>/dev/null))" \
+        || echo "postsetup: system-db compile failed (non-fatal)"
+    mkdir -p "$ROOTFS/etc/skel/.config/dconf"
+    chroot "$ROOTFS" dconf compile /etc/skel/.config/dconf/user /etc/dconf/db/local.d \
+        && echo "postsetup: skel user dconf db compiled" \
+        || echo "postsetup: skel user dconf db compile failed (non-fatal)"
+else
+    echo "postsetup: dconf or keyfile dir not found in rootfs - skipping dconf compile"
+fi
+PSEOF
+chmod +x "$_DCONF_POSTSETUP"
+
 cd "$MKLIVE_DIR"
 
 # ── Pre-bake nix packages ────────────────────────────────────────────────
@@ -226,6 +248,7 @@ trap _cleanup_mklive_builds EXIT
     -v linux-mainline \
     -p "$ISO_PKGS" \
     -I "$INCLUDE_DIR" \
+    -x "$_DCONF_POSTSETUP" \
     -x "$PROJECT_DIR/iso/postsetup-nvidia.sh" \
     -C "${BOOT_CMDLINE:-}" \
     -o "$OUT_ISO"