fix(linux): Three.js sRGBEncoding compatibility fix for r152+

[MrHaku81]

Bug

THREE.sRGBEncoding and the outputEncoding renderer property were removed in Three.js r152. This project uses three: ^0.181.0 (r181), so THREE.sRGBEncoding resolves to undefined at runtime, causing a silent WebGL renderer initialization failure on Linux.

The symptom on Linux is that the 3D viewer fails to render correctly and the app shows a blank/broken view.

Fix

Replace the deprecated API with the modern equivalent:

- outputEncoding: THREE.sRGBEncoding,
+ outputColorSpace: THREE.SRGBColorSpace,

outputColorSpace with THREE.SRGBColorSpace is the correct replacement since Three.js r152 and is consistent with how React Three Fiber handles color space internally.

Tested on

• CachyOS Linux (Arch-based), KDE Plasma, x86_64 — built from source, simulation mode (--mockup-sim) fully functional after this fix

Related

• Closes / contributes to Linux AppImage build fails due to Python venv native dependencies #35 (Linux support)
• An AUR package (reachy-mini-control) for Arch Linux / CachyOS will be submitted separately, making installation straightforward for Arch-based distributions

Notes

This fix was identified and tested while getting the app running on CachyOS Linux. The full debugging process and setup documentation (architecture overview, rebuild instructions, known warnings, manual daemon startup) is available at ~/reachy-debug.log in the test environment.

This investigation was assisted by Claude Code (Anthropic's CLI for Claude), which helped analyze the Tauri sidecar mechanism, the uv-trampoline source, and the Three.js API change.

🤖 Generated with Claude Code

[MrHaku81]

Additionally, I've published an AUR package for Arch-based distributions, making installation straightforward:
📦 https://aur.archlinux.org/packages/reachy-mini-desktop-app
Install via AUR helper: yay -S reachy-mini-desktop-app