JSON.stringify on large store objects (ae_loc, ae_api, slct, event lists)
was running on every navigation, comparing serialized strings of potentially
deep objects. Replace with targeted comparators:
- Root +layout.svelte: add shallow_equal() helper — O(n keys) key-by-key
identity check instead of O(serialized bytes). Used for ae_api, ae_loc,
and slct sync guards.
- Launcher +layout.svelte: ID-list join-compare for event_location_obj_li
and id_li__event_location (O(n) string vs O(n*m) stringify). Refactor
liveQuery closures to be pure (data-only, no store reads/writes inside
the async Dexie context where Svelte reactivity tracking is undefined).
Move store sync into separate $effects that compare updated_on + id
(O(1)) or ID-join (O(n)) rather than full object serialization.
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