Integrate Bria 3.1/3.2 Models and ControlNet Pipelines into InvokeAI

[ilanbria]

Summary

This feature PR integrates Bria 3.1/3.2 text-to-image models and their ControlNet pipelines into InvokeAI.

How

Area	Key Changes
Backend	Added invokeai/backend/bria/** including:- pipeline_bria.py, pipeline_bria_controlnet.py (diffusers workflows)- transformer_bria.py, controlnet_bria.py, helper & utility scripts- controlnet_aux detectors (Canny/OpenPose)
Model Manager	Added model_loaders/bria.py and updated probe/taxonomy for auto-discovery of Bria Main & ControlNet models.
Invocations / Nodes	New nodes under invokeai/nodes/bria_nodes/* including model loader, encoder, decoder, denoiser, latent sampler, and ControlNet handlers.
UI / API	- New field components (BriaMainModelFieldInputComponent.tsx, BriaControlNetModelFieldInputComponent.tsx)- Extended UIType enum for Node Editor integration- Updated Model Manager badges and schemas
Dependencies	Added scikit-image (required for OpenPose detector), updated uv.lock.
Scope	46 files changed, ~5,500 new LOC, 3 LOC removed

Representative commits:

• Add Bria text to image model and controlnet support

• Setup Probe and UI to accept bria main/controlnet models

• Added scikit-image required for Bria's OpenposeDetector model

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Related Issues / Discussions

• Follow-up to exploratory PR Setup Probe and UI to accept bria main models #7973 ("Setup Probe and UI to accept Bria main models").

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QA Instructions

Requires Bria model weights and a CUDA-11+ GPU (CPU supported, slower).

Steps:

1. Install Models

   • Set HF token with access to Bria's models.

   • Install briaai/BRIA-3.2.

   • Install briaai/BRIA-3.2-ControlNet-Union.

2. Load Workflow

   • Load the workflow from the attached file:

     [Bria text-to-image workflow.json](https://github.com/user-attachments/files/21217591/Bria.text-to-image.workflow.1.json)

3. Run Workflow

   • Run workflow without controlnet.

   • Run workflow with controlnet.

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Merge Plan

• Rebase onto main after current release.

• Docker/GHA runners require additional pip install scikit-image?

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Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)