docs: align man pages with code + fill documentation gaps (0.16.0 audit)

A full man<->code consistency audit surfaced options, format placeholders
and CSS classes that were implemented but undocumented, documented but not
implemented (some causing fmt crashes when copied from examples), and
defaults that disagreed with the code. This aligns the docs with the code
and fixes a few genuine code gaps.

Docs:
- Add the missing waybar-user(5) man page (and register it in meson.build)
- Document previously-undocumented options/placeholders/CSS across many
  modules (custom image-path/image-name/icon-size, graph_type/width/
  datapoints; battery smooth-power; wireplumber format-source/only-physical;
  mpris {position}/prefer-album-artist; network {signalStrengthApp}/compact
  bandwidth; pulseaudio {source_volume}/{source_desc}; upower {temperature}/
  {model}/{native-path}; wwan {power_state}/{imei}; tray ignore-list; and
  many CSS state classes: .sink-muted, .source-muted, .workspace-hover, etc.)
- Correct documented defaults to match the code (hyprland format {name},
  gamemode {count}, cpu-graph interval 5, cava input_delay 4, niri taskbar
  icon-size 16, disk/gps/wayfire formats, menu-actions object type, ...)
- Remove placeholders/options that do not apply (custom-graph {icon}/format/
  format-icons/rotate) and fix crashing examples (wwan {mode}, gps
  format-no-fix); note cava background/foreground/continuous_rendering are
  cava-config-file options

Code:
- bluetooth: accept the documented `controller` key as a synonym of
  `controller-alias` (the option was silently ignored)
- mango/workspaces: supply the documented `{name}` fmt arg (was missing ->
  fmt::format threw)
- privacy: read `tooltip` as a bool (was guarded on isString(), so the
  documented `tooltip: false` was silently ignored)

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

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

man/waybar-mpris.5.scd

@@ -26,7 +26,7 @@ The *mpris* module displays currently playing media via libplayerctl.
 
 *format*: ++
 	typeof: string ++
-	default: {player} ({status}) {dynamic} ++
+	default: {player} ({status}): {dynamic} ++
 	The text format.
 
 *format-[status]*: ++
@@ -40,7 +40,7 @@ The *mpris* module displays currently playing media via libplayerctl.
 
 *tooltip-format*: ++
 	typeof: string ++
-	default: {player} ({status}) {dynamic} ++
+	default: {player} ({status}): {dynamic} ++
 	The tooltip text format.
 
 *tooltip-format-[status]*: ++
@@ -140,6 +140,21 @@ The *mpris* module displays currently playing media via libplayerctl.
 	default: next track ++
 	Overwrite default action toggles.
 
+*on-click-backward*: ++
+	typeof: string ++
+	default: previous track ++
+	Overwrite the default action for the backward mouse button (button 8).
+
+*on-click-forward*: ++
+	typeof: string ++
+	default: next track ++
+	Overwrite the default action for the forward mouse button (button 9).
+
+*prefer-album-artist*: ++
+	typeof: bool ++
+	default: false ++
+	When true, use the album artist instead of the track artist for the _{artist}_ and _{dynamic}_ tags, falling back to the track artist when no album artist is available.
+
 *player-icons*: ++
 	typeof: map[string]string ++
 	Allows setting _{player_icon}_ based on player-name property.
@@ -168,6 +183,8 @@ The *mpris* module displays currently playing media via libplayerctl.
 
 *{length}*: Length of the track, formatted as HH:MM:SS
 
+*{position}*: Current playback position of the track, formatted as HH:MM:SS
+
 *{dynamic}*: Use _{artist}_, _{album}_, _{title}_ and _{length}_, automatically omit++
 	empty values