feat: Implement 'internalId' via Collection Identity Hook

Context: Currently, Neo.mjs relies on the record's primary key (keyProperty) for DOM element IDs (e.g., view__1). This presents several challenges:

1. Phantom Records: New records have no ID (null), causing DOM ID collisions (view__null).
2. DOM Security: Exposing database IDs in the DOM allows for enumeration attacks.
3. Stability: Saving a record changes its ID (e.g., -1 -> 100), forcing a destructive DOM update.
4. Cross-Store Uniqueness: Drag-and-drop between stores can lead to ID collisions if different entities share the same PK.

Objective: Implement a stable, globally unique internalId (e.g., neo-record-1) for all data items (Records and Raw Objects), maintained via a lightweight Symbol property.

Architecture: The "Identity Provider" Pattern To maintain the separation of concerns between Neo.collection.Base (dumb container) and Neo.data.Store (smart data manager), we will introduce an itemFactory hook.

Implementation Plan:

1. Define Symbol:

   • Create src/util/Symbol.mjs (or similar) to export const internalId = Symbol.for('neoInternalId');.

2. Enhance Neo.collection.Base:

   • Add itemFactory config (Function).
   • Inside the splice method's addition loop, invoke the hook:

             me.itemFactory?.(item);

   • Documentation: Add intent-driven JSDoc explaining this is an injection point for item augmentation (like identity) without requiring inheritance.

3. Update Neo.data.Store:

   • Implement assignInternalId(item) method.
   • In construct, bind this method to the itemFactory config.
   • Logic:

             if (!item[internalId]) {
         item[internalId] = Neo.getId('record');
     }

4. Update Neo.data.RecordFactory:

   • Ensure created Records also receive this symbol during instantiation.

5. Expose Accessor:

   • Add store.getInternalId(item) helper.

Outcome:

• Zero Iteration Overhead: Piggybacks on the existing Collection map generation loop.
• Decoupled: Collection remains ignorant of "Records".
• Secure & Stable: Provides the foundation for immutable DOM identities.