Subtle Effects Threads Fix

## Subtle Effects Thread Fix

**The definitive fix for the `Accessing LegacyRandomSource from multiple threads` crash caused by Subtle Effects on NeoForge 1.21.1.**

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### The Problem

When using **Subtle Effects** together with modern optimization mods (Sodium, Flywheel, ScalableLux, ModernFix, etc.) or simply with a heavily loaded client + integrated server, the game can randomly crash with:

The stacktrace almost always points to:

`einstein.subtle_effects.ticking.biome_particles.BiomeParticleManager.tickBiomeParticles`

This happens because Minecraft’s `LegacyRandomSource` is **not thread-safe**, and Subtle Effects was accessing it from a context where multiple threads could touch it.

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### The Solution

This mod applies two layers of protection:

1. **Primary fix**  
   Redirects `Level#getRandom()` / `Level#random()` calls inside `tickBiomeParticles` to a proper **thread-safe** `RandomSource` (ThreadLocal).

2. **Safety net**  
   If any `IllegalStateException` related to `LegacyRandomSource` still escapes, it is caught and that frame’s biome particle tick is simply skipped. The game continues running normally.

Result: **no more crashes**, while keeping biome particles working in the vast majority of cases.

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### Features

– Soft (optional) dependency on Subtle Effects — does nothing if the mod is not present
– Client-side only
– Zero configuration
– Extremely lightweight
– Fully compatible with heavy optimization packs

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### Installation

1. Install NeoForge 1.21.1
2. Install Subtle Effects
3. Install this mod
4. Launch the game

No configuration needed.

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### Compatibility

– Minecraft: **1.21.1**
– Loader: **NeoForge**
– Soft dependency: **Subtle Effects**

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### Credits

Made for the **Perfection Rework** visual stack.  
Inspired by the original Subtle Fix concept.

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### License

MIT