Stashing a window now stops an active screencast of it, rather than leaving the
consumer on a frozen last frame (a stashed window is never rendered). Covers
both stash paths - Mod+M and Mod+Shift+M's hide branch - by diffing which
windows left the layout across the action, so scratchpad_show's branch logic
isn't duplicated in the caller. Dynamic-target casts are retargeted to Nothing
rather than ended; that carve-out is documented inline.
Also widen the acceptance harness spawn wait to 30s: each test launches its own
nested niri, and a cold alacritty start occasionally exceeded the old 10s.
Deliberately not a retry, which could double-spawn and corrupt window counts.
117 unit tests and 8/8 live acceptance pass.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
funman300
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