fix: useProperty init sets default even when preventDefault is called

[megheaiulian]

Problem

When a parent component uses lift() to listen to a child's property change event without passing the property value to the child (no .prop=${value} binding), useProperty's initialization is blocked by preventDefault(), leaving the host property undefined.

This causes TypeError: Cannot read properties of undefined (reading 'length') crashes in components like cosmoz-omnitable's renderFooter when selectedItems is never initialized.

Root cause

useProperty's constructor calls this.updater(initialValue) to set the default. updater dispatches a notification event, and if a lift listener calls ev.preventDefault(), the host property is never set:

updater(valueOrUpdater) {
    const ev = this.notify(value, updater);
    if (ev.defaultPrevented) return;  // ← host property never set on init!
    // ...
    this.state.host[this.property] = value;
}

This is correct for subsequent updates (parent takes over via its own state), but wrong for initialization — the host should always get its default value.

Fix

Add an isInit flag to updater() that bypasses the preventDefault veto during initialization:

updater(valueOrUpdater, isInit = false) {
    const ev = this.notify(value, updater);
    if (!isInit && ev.defaultPrevented) return;  // only veto non-init updates
    // ...
}

Constructor passes true:

this.updater(initialValue, true);

This ensures:

• The host always gets its default value on init
• The notification event still fires (so lift syncs parent state)
• Subsequent updates retain full preventDefault / lift two-way binding semantics

Test

Added a test reproducing the exact scenario: parent uses lift without passing the property, verifying the child's host gets the default [].

[changeset-bot]

🦋 Changeset detected

Latest commit: 9ee4a75

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@pionjs/pion	Patch

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[megheaiulian]

And I gotta add a changeset too.