## Summary
Wire `essentials_category` through from backend to the Essentials tab
UI. Creates a single source of truth for node categorization and
ordering.
### Changes
**New file — `src/constants/essentialsNodes.ts`:**
- Single source of truth: `ESSENTIALS_NODES` (ordered nodes per
category), `ESSENTIALS_CATEGORIES` (folder display order),
`ESSENTIALS_CATEGORY_MAP` (flat lookup), `TOOLKIT_NOVEL_NODE_NAMES`
(telemetry), `TOOLKIT_BLUEPRINT_MODULES`
**Refactored files:**
- `src/types/nodeSource.ts`: Removed inline `ESSENTIALS_CATEGORY_MOCK`,
imports `ESSENTIALS_CATEGORY_MAP` from centralized constants
- `src/services/nodeOrganizationService.ts`: Removed inline
`NODE_ORDER_BY_FOLDER`, imports `ESSENTIALS_NODES` and
`ESSENTIALS_CATEGORIES`
- `src/constants/toolkitNodes.ts`: Re-exports from `essentialsNodes.ts`
instead of maintaining a separate list
**Subgraph passthrough:**
- `src/stores/subgraphStore.ts`: Passes `essentials_category` from
`GlobalSubgraphData` and extracts it from `definitions.subgraphs[0]` as
fallback
- `src/platform/workflow/validation/schemas/workflowSchema.ts`: Added
`essentials_category` to `SubgraphDefinitionBase` and
`zSubgraphDefinition`
**Tests:**
- `src/constants/essentialsNodes.test.ts`: 6 tests validating no
duplicates, complete coverage, basics exclusion
- `src/stores/subgraphStore.test.ts`: 2 tests for essentials_category
passthrough
All 43 relevant tests pass. Typecheck, lint, format clean.
**Depends on:** Comfy-Org/ComfyUI#12573
Fixes COM-15221
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9091-feat-wire-essentials_category-for-Essentials-tab-display-30f6d73d3650814ab3d4c06b451c273b)
by [Unito](https://www.unito.io)
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Co-authored-by: github-actions <github-actions@github.com>
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