feat: add proxyWidgetSelector to subgraph blueprints

[jtydhr88]

Add channel/tone selector dropdowns to Color Curves and Color Balance blueprints so only one group of widgets is shown at a time, matching industry-standard UX (Photoshop, GIMP).
Need FE changes Comfy-Org/ComfyUI_frontend#10840

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 84f17d5b-4661-44c6-abfe-84fea2f1b947

📥 Commits

Reviewing files that changed from the base of the PR and between f21f6b2 and 7ed31f7.

📒 Files selected for processing (2)

• blueprints/Color Balance.json
• blueprints/Color Curves.json

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📝 Walkthrough

Walkthrough

Two blueprint JSON files were updated to add proxyWidgetSelector configurations. The Color Balance blueprint now includes a "Tone" selector with three options (Shadows, Midtones, Highlights), each mapping to distinct widget value groups. The Color Curves blueprint adds a "Channel" selector with four options (RGB Master, Red, Green, Blue), each mapping to different curve editor nodes. Both selectors provide a default selection and define widget-to-control mappings. The changes enable dynamic switching between different groups of controls within each blueprint. All other graph structures, shader code, and existing configurations remain intact.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding proxyWidgetSelector to subgraph blueprints, which matches the actual modifications to the Color Balance and Color Curves blueprint files.
Description check	✅ Passed	The description is directly related to the changeset, explaining the purpose of adding selector dropdowns to the Color Curves and Color Balance blueprints to control widget visibility, matching the actual changes made.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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