Previously the intersection-observer cache grew monotonically: once a
card mounted its ListView + Dexie liveQuery, it stayed mounted for the
lifetime of the workbench page. A user who scrolled through 20 apps
kept 20 parallel liveQueries alive.
Now the cache is capped at MAX_MOUNTED=8 with insertion-order LRU
semantics: re-intersecting a mounted card bumps it to MRU, and the
oldest gets evicted when a new mount pushes the set over cap. Set
insertion-order is used for the LRU list so the template's has()
check stays O(1).
The cap is well above typical working-set sizes (3–6 apps) so regular
workbench use never hits the eviction path. Users with large scenes
pay at most one extra liveQuery + chunk re-request when scrolling back
to an evicted card.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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