Autostart option added

docs/daemon-plan.md

@@ -361,6 +361,39 @@ Start-up orders:
   comes from a build without the action — and `on_activate` re-presents the
   window that is already there instead of building a second one. A stale window
   therefore never stays next to a fresh one, and the daemon is not involved.
+- Menu, help and options: `Help` (also `F1`) opens a one-page explanation of the
+  rows, types, capture dialog, daemon status and tray; `Options` opens a small
+  non-modal window with the GUI's own switches (tray behaviour, language,
+  autostart) and the daemon in detail (state, version, keyboard, config file, last
+  key), while the footer keeps the one-line summary. A `GMenu` cannot host a
+  switch, so the options are a window.
+- Autostart is the session's `.desktop` entry and nothing else
+  (`src/autostart.{h,cpp}`): `~/.config/autostart/gkeymapper.desktop` existing (and
+  not switched off by the desktop's own tool) *is* "on", so the switch cannot
+  disagree with what the session reads at login. It starts the window, never the
+  daemon: the daemon is a user service, and it stays the only part that has to
+  run. The window is a convenience — the mappings can be edited any time, and the
+  G keys work with it closed.
+- Language switching is immediate, without a restart and without losing rows that
+  were not saved: gettext is handed the code through `LANGUAGE` plus a fresh
+  `setlocale`, and the windows are built again (the rows are carried over with
+  `collect_mappings`/`apply_mappings`; the tray menu is announced with
+  `LayoutUpdated`). `System language` is the default and follows the desktop;
+  the choice lives in `gui.conf` and is applied before the first string is built,
+  so a restart keeps it.
+- `Minimize to tray`: closing or minimizing hides the window instead of quitting,
+  and the tray icon shows it again (`Show`) or quits the program (`Close`). GTK4
+  has no minimize signal and `GdkToplevel` has no properties, so the state is
+  polled (250 ms) while the option is on; hiding happens only while a panel really
+  hosts the icon — without one there would be no way back to the window. The
+  preference lives in `~/.config/gKeyMapper/gui.conf`, next to `mappings.conf` but
+  a file of its own, so a mapping file stays a mapping file.
+- The tray icon is a `StatusNotifierItem` plus a `com.canonical.dbusmenu` menu
+  spoken over GIO (`src/trayicon.{h,cpp}`): the protocol libxapp and
+  libappindicator wrap, without their GTK3 dependency — a GTK4 process must not
+  load GTK3. The icon travels as an `IconPixmap`, because the panel is another
+  process and cannot read the icons compiled into the binary. Both watcher names
+  are watched and the item registers once, preferring `org.kde.StatusNotifierWatcher`.
 
 ## 6. Code layout
 
@@ -368,6 +401,11 @@ Start-up orders:
 src/                     # GUI (existing)
   daemonclient.{h,cpp}   # D-Bus client (status/reload/signals)
   singleinstance.{h,cpp} # one GUI only: a new start closes the running instance
+  trayicon.{h,cpp}       # tray icon: StatusNotifierItem + dbusmenu over GIO
+  settings.{h,cpp}       # gui.conf (window preferences, e.g. minimize to tray)
+  autostart.{h,cpp}      # the session's autostart entry (~/.config/autostart)
+  help.{h,cpp}           # help window
+  optionsdialog.{h,cpp}  # options window: switches + detailed daemon status
 daemon/                  # as implemented (see §6 above)
   ipc_dbus.{h,cpp}       # GDBus service (control plane)
 shared/