4 layered color systems create fragile overrides

## Recommendation

### 🔍 INVESTIGATE: Simplify color system layering

Four overlapping color systems create complexity and fragile override chains.

## What Was Found

| System | Location |
|---|---|
| **Design system CSS variables** | `packages/design-system/src/css/style.css` (Tailwind @theme) |
| **PrimeVue Aura preset** | `src/main.ts` (PrimeVue theme config) |
| **Color palette JSON system** | `colorPaletteStore.ts` + `colorPaletteService.ts` (overrides LiteGraph & Comfy variables) |
| **LiteGraph CSS** | `src/lib/litegraph/public/css/litegraph.css` |

## Context

The color palette service dynamically overrides CSS variables set by the design system, which can be fragile. As PrimeVue is migrated away, one layer will eventually be removed. Consider having the palette system generate Tailwind-compatible tokens directly.

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**Category:** Conflicting Systems | **Confidence:** MEDIUM | **Tools:** Semantic analysis
_Filed by audit-code skill_

Part of #11022

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-11048-4-layered-color-systems-create-fragile-overrides-33e6d73d3650815e849afc2c200c50ff) by [Unito](https://www.unito.io)