add render mode that doesn't intersect rays for debugging purposes

[jeffamstutz]

No description provided.

[Copilot]

Pull request overview

This PR adds a new TEST_FRAME render mode for debugging purposes that visualizes ray directions without performing ray-scene intersections. This allows developers to verify camera setup and ray generation without the overhead of scene traversal.

• Adds TEST_FRAME enum value to RenderMode
• Implements early-exit rendering logic that maps ray directions to RGB colors
• Updates JSON configuration to include the new mode

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/devices/helide/renderer/Renderer.h	Adds TEST_FRAME enum value to RenderMode
src/devices/helide/renderer/Renderer.cpp	Implements string-to-enum conversion and rendering logic for TEST_FRAME mode
src/devices/helide/HelideDefinitions.json	Adds "testFrame" to allowed renderer mode values
src/devices/helide/frame/Frame.cpp	Minor formatting improvement to getProperty function signature

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.