ext-layer-shell: fix configure feedback loop; default Super toggles fuzzel

The intermittent "Super needs several presses to open fuzzel" bug was a
layer-shell configure storm, not a keybinding issue. The per-surface commit
handler called arrange() on EVERY wl_surface commit, and arrange()
unconditionally calls wlr_scene_layer_surface_v1_configure, which in wlroots
0.20 emits a fresh configure each call. A client acking + applying its configure
re-entered the commit handler, producing an unbounded
configure -> ack_configure -> commit -> configure loop that overflowed the
client's 4 KiB connection buffer ("Data too big for buffer") and got it killed
mid-handshake. fuzzel therefore only displayed when the burst happened to flush
in time.

Fix: only re-arrange on the initial commit or a commit that changes a
layout-relevant field (current.committed != 0); a plain buffer/frame commit no
longer triggers a configure.

Also:
- ext-keybindings: tap-Super now defaults to a launcher TOGGLE
  ("pkill -x fuzzel || fuzzel") in both default_bindings() and the sample
  unbox.toml — pressing Super while fuzzel is open closes it.
- ext-keybindings: a genuine Super press always re-arms a clean tap, so a
  dropped Super release can no longer eat the next tap (robustness).
- tests: update default-command assertions; add a bounded-configure invariant
  guard to the layer-shell client test.

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