## Problem
Switching from the app to Settings sometimes makes every settings page
unscrollable until a full page reload.
## Cause
`MainAppLayoutOutlet` cross-fades between the app and settings with
`AnimatePresence`, rendering both pages into the same grid cell
(`grid-area: 1 / 1`). When an exit animation doesn't clean up, the
outgoing page stays mounted on top of the active one. With the default
`pointer-events: auto`, that (now invisible) stale node intercepts
wheel/scroll events before they reach the page underneath — so the page
won't scroll even though its own scroll container is fine. The node
lives in the always-mounted layout, which is why it survives in-app
navigation and only a reload clears it.
A broken vs. working DOM snapshot differs only in the number of children
in the transition grid cell (2 vs 1) and which element sits under the
cursor; the scroll container, its CSS, and the whole flex/height chain
are identical.
## Fix
Set `pointer-events: none` on exiting pages so a stale exit node can't
capture input from the active page.
Tested by reproducing the stale-node-on-top state and confirming
`pointer-events: none` lets wheel/scroll reach the live page across the
content area, while the entering page stays interactive.
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Félix Malfait
adfef5c830
