Fix window memory never saving on close, and split-screen icon/primary bugs

Screenshotted the just-split display on request rather than guessing --
it showed why windows never seem to remember placement/size, plus two
real split-screen bugs.

Window memory (WindowManager::remembered_geometry) was correctly wired
on the read side, but the only writes came from end_drag/end_resize in
dragresize.rs - a real drag or resize. A window the user opens, looks
at, and closes without ever touching its edges had nothing recorded, so
reopening it always fell back to a fresh cascade placement, for what is
probably most ordinary window lifecycles. remove_window now also
snapshots geometry (same app_id-non-empty gate the drag/resize sites
use), persisted at both of its wayland-side call sites the same way the
drag/resize-release site already does.

desktop_icon_origins mirrored the full icon set onto every Monitor entry
when general.desktop_icons_all_monitors is on - which, after a
srd.monitor.split, is one entry per split part of the same physical
screen, not one per real monitor. Extracted into a separately-tested
icon_origins_for that collapses split parts of the same connector back
to one origin, keeping a genuinely separate monitor's own origin intact.

Found while fixing that: every split part also reported primary: true
(computed from the connector's name, which doesn't vary per part) --
fixed by gating on part == 0 too.

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