Add a switchers chapter and fix drift found on a second manual pass

Add "Coming From Mac or Windows" as chapter 3: a translation layer for
Cmd/Win instincts rather than a feature tour.

Fill the remaining coverage gaps: fcitx5 input methods, laptop speaker
tuning, touchpad haptics, crash capture in the toggle table, the
installable font list, and the ChatGPT Desktop and Grok Bot entries.

Correct claims that drifted from the source: the network and bluetooth
bar icons no longer launch nmtui/bluetoothctl, monitor scaling steps
rather than cycles, and the display widget's scroll steps brightness.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

manual/09-reminders.md

@@ -0,0 +1,5 @@
+# Reminders
+
+Omarchy has a built-in way to set simple reminders based on a countdown timer and with a message. You can do this via `Super + Ctrl + R`, seeing all the ones set via `Super + Ctrl + Alt + R`, and clearing all via `Super + Ctrl + Shift + R`. Everything also accessible via _Trigger > Reminder_. You can also use the cli with `omarchy reminder 7 'Tea ready'`.
+
+ ![screenrecording-2026-05-08_14-35-22-720p.gif](https://learn.omacom.io/u/screenrecording-2026-05-08_14-35-22-720p-3g9dVE.gif)