fix(bindx): notify global subscribers on nested child field edit (#51)

[matej21]

Fixes #51.

Problem

A scalar field edit on a child entity (registered via registerParentChild — i.e. nested in a hasMany/hasOne) notified the entity-scoped subscribers but never the global subscribers. usePersist().isDirty subscribes through store.subscribe() (global), so a Save button gated on isDirty stayed disabled after editing a nested field — even though getAllDirtyEntities() reported the change correctly. A top-level (parentless) entity edit was unaffected.

Root cause

SubscriptionManager.notifyEntitySubscribers gated the global notification on notifiedKeys.size === 1, but that guard ran after the parent-propagation loop had already grown the shared notifiedKeys set. For any leaf with a parent, size >= 2 by the time the guard ran → globals skipped. A parentless entity has no recursion, so size === 1 held — which is why only nested entities were affected.

Fix

Capture isRoot = notifiedKeys.size === 0 before adding the key / recursing, and gate the global notification on isRoot.

Test

Ports the regression test from the issue to tests/unit/store/global-subscriber-child-field-edit.test.ts:

• child-entity field edit now notifies global subscribers exactly once;
• the existing top-level case stays green (control).

Full tests/unit/store/ suite + subscriptionRekey pass (143 tests). The pre-existing bindx-form FormHasManyRelationScope failure and the example/App.tsx typecheck error are unrelated and present on main.

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