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/wireplumber.cpp

@@ -118,15 +118,23 @@ void waybar::modules::Wireplumber::updateNodeName(waybar::modules::Wireplumber*
 
   // find form-factor
   const auto* devid = wp_properties_get(properties, "device.id");
-  spdlog::debug("[{}]: '{}' device.id is {}", self->name_, self->type_, devid);
+  if (devid != nullptr) {
+    spdlog::debug("[{}]: '{}' device.id is {}", self->name_, self->type_, devid);
 
-  auto* dev = static_cast<WpDevice*>(wp_object_manager_lookup(
-      self->om_, WP_TYPE_DEVICE, WP_CONSTRAINT_TYPE_G_PROPERTY, "bound-id", "=s", devid, nullptr));
+    g_autoptr(WpDevice) dev = static_cast<WpDevice*>(
+        wp_object_manager_lookup(self->om_, WP_TYPE_DEVICE, WP_CONSTRAINT_TYPE_G_PROPERTY,
+                                 "bound-id", "=s", devid, nullptr));
 
-  if (const auto* ff =
-          wp_pipewire_object_get_property(WP_PIPEWIRE_OBJECT(dev), "device.form-factor")) {
-    self->form_factor_ = ff;
-    spdlog::debug("[{}]: Updating node form factor to: {}", self->name_, self->form_factor_);
+    const gchar* ff = dev != nullptr ? wp_pipewire_object_get_property(WP_PIPEWIRE_OBJECT(dev),
+                                                                       "device.form-factor")
+                                     : nullptr;
+
+    if (ff != nullptr) {
+      self->form_factor_ = ff;
+      spdlog::debug("[{}]: Updating node form factor to: {}", self->name_, self->form_factor_);
+    } else {
+      self->form_factor_ = "";
+    }
   } else {
     self->form_factor_ = "";
   }
@@ -614,7 +622,10 @@ bool waybar::modules::Wireplumber::handleScroll(GdkEventScroll* e) {
     step = config_["scroll-step"].asDouble();
   }
   if (config_["max-volume"].isDouble()) {
-    maxVolume = config_["max-volume"].asDouble();
+    // {volume} is displayed as cubic-percent (pow(volume_, 3) * 100), while volume_/newVol are
+    // linear gains. Map the documented cubic-percent ceiling into the linear domain the clamp
+    // operates in, restoring the 0.15.0 cap semantics (e.g. 130 -> cbrt(1.3) linear -> 130%).
+    maxVolume = cbrt(config_["max-volume"].asDouble() / 100.0);
   }
 
   double vol = volume_;