fix: backward-compat + bug fixes and man-page build fix for 0.16.0

Post-0.15.0 review of the 0.15.0..HEAD range surfaced regressions and
bugs. This restores backward compatibility for existing configs/CSS,
fixes confirmed defects, and repairs the scdoc man-page build break on
master. Pango-markup tooltips are intentional and were kept.

Backward-compat restorations:
- AModule: honor legacy numeric Gdk::CursorType cursor values (int overload)
- memory: correct GiB divisor (was ~2.3% low); round bare {} placeholders
- wireplumber: scale max-volume into the linear domain so the cap works again
- idle_inhibitor: gate right/middle-click deactivate & scroll on dynamic-timeouts;
  accept both dynamic-timeout(s); widen timeout to double (no fractional truncation)
- custom: keep #custom-<name>.<class> CSS selectors working (classes on box_)
- image: don't wordexp-split a single path; fall back to the literal path
- niri/window: restore hide-when-empty (new show-empty opt-in); escape tooltip
- wlr/taskbar: plain-text tooltip when markup is disabled

Bug fixes:
- tray: fix use-after-free in onAdd; guard the watcher retry timeout
- hyprland: clamp max-windows iterator (OOB); drop duplicate language tooltip block
- niri/window: supply {col}/{max_col} args in the empty branch (fmt::format_error)
- mpris: escape {dynamic}/{player} tooltip; fix dangling player; albumArtist source
- mango: fix use-after-free race (dispatch under callback_mutex_)
- mpd: contain throwing checkErrors in noexcept idle paths (no std::terminate/UAF)
- keyboard_state: always render every lock label, with guarded defaults
- bluetooth: bound GATT ReadValue timeout, opt-in + services-resolved gating,
  preserve authoritative Battery1 percentage
- wireplumber: fix WpDevice reference leak / NULL handling
- battery, clock, dwl, wayfire, graph, custom_graph, transform, river: assorted
  crash/logic fixes

Man page / build:
- niri-workspaces: fix scdoc "indented by an amount greater than 1"
  (workspace-taskbar sub-options were mis-indented; breaks man-page build)
- document new show-empty (niri/window); correct network {txBitrate}/{rxBitrate}

Not compiled locally (no gtkmm on this host); C++ build relies on CI.
Man pages validated with scdoc 1.11.4.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/modules/mpris/mpris.cpp

@@ -385,6 +385,7 @@ auto Mpris::onPlayerNameAppeared(PlayerctlPlayerManager* manager, PlayerctlPlaye
 
   if (mpris->player != nullptr) {
     g_signal_handlers_disconnect_by_data(mpris->player, mpris);
+    if (mpris->last_active_player_ == mpris->player) mpris->last_active_player_ = nullptr;
     g_clear_object(&mpris->player);
   }
   mpris->player = playerctl_player_new_from_name(player_name, nullptr);
@@ -544,11 +545,12 @@ auto Mpris::getPlayerInfo() -> std::optional<PlayerInfo> {
   if (error) goto errorexit;
 
   if (auto* album_artist_ =
-          playerctl_player_print_metadata_prop(player, "xesam:albumArtist", &error)) {
+          playerctl_player_print_metadata_prop(last_active_player_, "xesam:albumArtist", &error)) {
     spdlog::debug("mpris[{}]: albumArtist = {}", info.name, album_artist_);
     info.album_artist = album_artist_;
     g_free(album_artist_);
   }
+  if (error) goto errorexit;
 
   if (auto* album_ = playerctl_player_get_album(last_active_player_, &error)) {
     spdlog::debug("mpris[{}]: album = {}", info.name, album_);
@@ -745,7 +747,8 @@ auto Mpris::update() -> void {
   if (tooltipEnabled()) {
     try {
       auto tooltip_text = fmt::format(
-          fmt::runtime(tooltipstr), fmt::arg("player", info.name),
+          fmt::runtime(tooltipstr),
+          fmt::arg("player", std::string(Glib::Markup::escape_text(info.name))),
           fmt::arg("status", info.status_string),
           fmt::arg("artist",
                    std::string(Glib::Markup::escape_text(getArtistStr(info, tooltip_len_limits_)))),
@@ -754,7 +757,7 @@ auto Mpris::update() -> void {
           fmt::arg("album",
                    std::string(Glib::Markup::escape_text(getAlbumStr(info, tooltip_len_limits_)))),
           fmt::arg("length", tooltipLength), fmt::arg("position", tooltipPosition),
-          fmt::arg("dynamic", getDynamicStr(info, tooltip_len_limits_, false)),
+          fmt::arg("dynamic", getDynamicStr(info, tooltip_len_limits_, true)),
           fmt::arg("player_icon", getIconFromJson(config_["player-icons"], info.name)),
           fmt::arg("status_icon", getIconFromJson(config_["status-icons"], info.status_string)));