docs(man): backfill man pages with wiki-only info (source-of-truth pass)

Port information that previously lived only in the GitHub wiki into the
authoritative scdoc man pages, so the man pages become the single source
of truth for module documentation.

33 man pages enriched (options, format replacements, actions, style
selectors, troubleshooting and implementation notes). Additions were
verified against the source; stale/incorrect wiki entries were
deliberately not ported. All pages still compile with scdoc.

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

man/waybar-tray.5.scd

@@ -55,6 +55,9 @@ Addressed by *tray*
 	Key: name of item. ++
 	Value: integer, higher value means to place this item to the right.
 
+Note: custom *icons* only work with actual image files, not font-based icons. They
+might not work for some Electron apps (see https://github.com/electron/electron/issues/40936).
+
 *ignore-list*: ++
 	typeof: array ++
 	List of strings used to hide matching tray items. An item is hidden when any string in the list is found (as a substring) in the item's bus name, category, icon name, id or title.
@@ -80,6 +83,20 @@ Addressed by *tray*
 # STYLE
 
 - *#tray*
-- *#tray > .passive*
-- *#tray > .active*
-- *#tray > .needs-attention*
+- *#tray menu* for the context menu
+- *#tray widget>image* for icons
+- *#tray > .passive* for icons with status *Passive*
+- *#tray > .active* for icons with status *Active*
+- *#tray > .needs-attention* for icons with status *NeedsAttention*
+
+# TRAY APPLETS
+
+The following applets are known to work with the *tray* module:
+
+- *NetworkManager*: install networkmanager, enable it with
+  *systemctl enable NetworkManager.service*, and start the applet with
+  *nm-applet --indicator*.
+- *Blueman*: enable the Bluetooth daemon, install blueman, and start
+  *blueman-applet*.
+- *Electron apps*: apps like Slack, Telegram, Caprine and Discord should work
+  out of the box.