feat: update for angular 20

[denisyilmaz]

Summary

• upgrade to latest Rive runtime and Angular 20 APIs
• drop zone.js and embrace inject() and signals
• document new control flow syntax example

Testing

• npm test (fails: sh: 1: ng: not found)

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https://chatgpt.com/codex/tasks/task_b_689b60f0530483219512e5dfd64318f5

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Latest commit: f75b943

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