* fix(dictation-pad): keep pad window out of the compositor ghost state
On GNOME Wayland an idle, fully covered toplevel gets shelved by the
compositor: it stays in the window list but renders nothing and takes
no input. Keep the pad floating above other windows and pinned to all
workspaces so it cannot be shelved, track iconify/obscure state events,
deiconify on show, and repaint when visibility returns.
Fixes#896
* test(dictation-pad): scope Window return_value patch in shelving test
* fix(dictation-pad): detect Wayland shelving and recreate dead surface
set_keep_above is a stub in GTK3's Wayland backend, so a covered idle pad
still gets shelved by the compositor on GNOME/Wayland: it stays in the
window list but draws nothing and takes no input, and present() cannot
revive it.
Add a frame-callback watchdog: each tick callback stamps the clock and a
GLib timeout flags a mapped window whose frames went cold as shelved. A
shelved pad is then recreated (hide + show_all) in show_pad, the same
path the user's manual Close + tray reopen takes.
Keep keep_above/stick for X11 where they are honored, plus the iconify
and visibility-event handling from the previous commit.
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Co-authored-by: Jatin K Malik <jatinkrmalik@gmail.com>
