Fix taskbar detection and off-screen floor landing; add periodic bathmaster

The taskbar (run, run_begin, jump, walk_task2, and everything gated on
only="taskbar") was completely unreachable: WayfireWindows never
populated self._taskbar, it was hardcoded to None. Detect it for real
by unioning any wide, thin desktop-environment layer-shell surface
(waybar, a top/bottom panel) anchored to top or bottom.

That surfaced two more bugs once sheep actually started landing on it:

- The taskbar floor was placed at the panel's top edge unconditionally,
  which is correct for a bottom-anchored bar but puts the sheep above
  y=0 (off-screen) for a top-anchored one like this desktop's waybar.
  Now it stands on whichever edge faces the screen interior.

- Toplevel windows were used as landing floors regardless of whether
  their reported y was actually on the visible screen. This
  compositor's wide-viewport layout returns raw/absolute geometry for
  windows on other workspaces, so a window can have x within screen
  bounds while y sits off the top entirely — landing there also put
  sheep above y=0, invisible. Windows are now only used as floors when
  their top edge is within [0, screenH].

Also added a periodic timer (mirroring the existing eat/hop timers) to
trigger the batha→bathb→bathc→bathd bath sequence on an idle sheep
every 90-180s. It was only ever reachable via a ~3% spawn-time roll,
so in practice it was almost never seen.

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