Fix virtual mic routing: WirePlumber was restoring the stream to the speakers

WirePlumber's node.stream.restore-target remembers where each stream last
played and restores it, ignoring the default sink, so vois.rs output kept
going to the headphones. setup() now installs a wireplumber.conf.d override
(restore-target/props = false) and restarts WirePlumber on first use.
Also: virtual mic setup runs before any device queries, and keep_others_off
pulls our own stream back onto vois.rs if it drifts.

scripts/setup_virtual_mic.sh

@@ -8,6 +8,27 @@ SINK_NAME="vois.rs"
 SINK_DESC="vois.rs virtual mic"
 REMAP_NAME="vois.rs"
 
+CONF_DIR="${XDG_CONFIG_HOME:-$HOME/.config}/wireplumber/wireplumber.conf.d"
+CONF_FILE="${CONF_DIR}/51-vois.conf"
+
+# WirePlumber remembers stream targets and restores them, so streams that once
+# played to the speakers keep going there even after the default sink changes.
+# Disable that so the app's output follows the default (vois.rs).
+if [ ! -f "${CONF_FILE}" ] || ! grep -q "restore-target = false" "${CONF_FILE}" 2>/dev/null; then
+    mkdir -p "${CONF_DIR}"
+    cat > "${CONF_FILE}" <<EOF
+wireplumber.settings = {
+  node.stream.restore-target = false
+  node.stream.restore-props = false
+}
+EOF
+    echo "installed WirePlumber fix (${CONF_FILE})"
+    systemctl --user restart wireplumber || true
+    echo "restarted WirePlumber"
+else
+    echo "WirePlumber fix already present"
+fi
+
 # Idempotency check: field 2 of `pactl list short <x>` is the object name.
 if ! pactl list short sinks | awk -v n="${SINK_NAME}" '$2==n' | grep -q .; then
     pactl load-module module-null-sink \