[ fix ] : fix memory leaks and standardize subscription lifecycle in v0.9

[Dijo-404]

Description

Fixes #963 — Addresses critical memory leaks and standardizes subscription lifecycle management across the A2UI web_core and Angular renderer. This PR prevents unbounded memory growth in long-lived surfaces and eliminates leaked background processes (e.g., timers) when components unmount or properties update.

What's Fixed

• DataModel.signals cache: Added reference counting to evict unused signal entries and prevent unbounded Map growth.
• FormatString leaks: Tracked and disposed of all recursive signals created inside format strings (e.g., ${now()}).
• DataContext unsubscribe chain: Properly propagated unsubscribe ownership for signals returned by function implementations.
• Angular ComponentBinder scoping: Moved DestroyRef injection to component scope to prevent application-lifetime subscription leaks.
• Angular stale bindings: Wired up ComponentModel.onUpdated to refresh component properties when the protocol updates them.

Testing

• Added regression tests verifying AbortSignal listeners and internal Maps are cleared on component unmount.

Verification

1. Verify Memory Leak Fixes

2. Verify Angular Build

Note

There is an lint error in src/v0_9/catalog/types.test.ts which i haven't touched, its due unused variables, let me know should i fix that and push it in this pr itself or i need to put it as an issue and issue another pr fixing that

[gemini-code-assist]

Code Review

This pull request implements a comprehensive signal lifecycle management system to prevent memory leaks across the Angular, React, and web_core renderers. Key changes include the introduction of signal reference counting in the DataModel, explicit disposal methods for bound properties, and improved cleanup logic for dynamic values and function calls. Feedback suggests simplifying subscription management in the Angular ComponentHostComponent by directly using the subscription object within the cleanup callback to remove unnecessary class properties.