[LKasianAnsys]

Issue

Resolves #28

Context

This PR implements picking in VISOR's SERVER mode. Until now, clicking on a server-mode frame did not select any parts of a rendered dataset. This PR enables picking by sending the click to pick_part_at in render-window device pixels, and routse the result through a shared ViewerClickDispatcher used by both SERVER and CLIENT mode.

Manual check: in server mode, click on a part of a multiblock dataset. it should appear as selected in the tree view. In client mode, there should be no changes.

Copilot summary

This pull request introduces a new feature for VISOR's server mode: users can now select parts by clicking on a streamed frame. The implementation standardizes and improves the handling of viewer click events across both server and WASM renderers by introducing a shared ViewerClickDispatcher utility. It also improves error handling and adds comprehensive tests to ensure correct behavior. The most important changes are grouped below.

Remote Rendering Feature:

• Added support for selecting parts by clicking a streamed frame in remote rendering 4.3c.

Viewer Click Handling Refactor:

• Introduced the ViewerClickDispatcher utility to manage viewer click listeners and ensure only one pick operation runs at a time; this is now used by both the server (ServerRenderer) and WASM (VtkScene) renderers. [1] [2] [3] [4] [5]

Server Renderer Improvements:

• Refactored ServerRenderer to use ViewerClickDispatcher for click handling, including normalized click position translation, error logging, and listener notification. [1] [2] [3] [4] [5]

WASM Renderer Improvements:

• Updated VtkScene to use ViewerClickDispatcher, simplifying the click event flow and ensuring consistent pick dispatching logic with the server renderer. [1] [2] [3] [4] [5]

Testing and Error Handling:

• Added and updated Jest tests to verify correct pick dispatching, listener notification, and error logging for failed picks. [1] [2] [3] [4]

These changes collectively improve user interaction with rendered frames and ensure robust, maintainable click-handling logic across the codebase.