Fix desktop-icon deselection and workspace-teleport-on-close; document a shadow limit

Desktop icons stayed highlighted after clicking a window: select_desktop_icon(None)
was only ever called from start_desktop_marquee, never from the one place every
focus path (click, Alt-Tab, dock IPC, scratchpad show, snap flyout) already
funnels through. Added the deselect there instead of per-caller.

Closing a focused window could silently switch the user's active workspace:
remove_window's fallback picked self.order.last(), but that list is global,
not per-workspace, so it could land on a background window elsewhere - and
focus_window already switches workspace to match whatever it's given (a real,
separate feature for a deliberate srd dispatch focus). Fixed by preferring a
same-workspace window first. New general.close_focus_follows_workspace
(default false, live-settable) controls what happens only when nothing is
left on the current workspace at all: off leaves focus at nothing, matching
Windows/GNOME/macOS; on restores the old always-follow-the-global-fallback
behaviour. Three new tests.

Also documented, not fixed: shadows can still bleed onto a neighbouring
*monitor* near a multi-output seam (shadow_rect has no monitor-boundary
awareness), found via a live cross-monitor screenshot. Moot for this
session since general.shadows is already off in the live config, but a
real, open gap for anyone who re-enables shadows on a multi-monitor setup.

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