feat: call generate image API if isImageGeneration is true.

[agatha197]

Add Image Generation Feature to LLM Chat Component

This PR adds image generation capabilities to the LLM Chat Card component, allowing users to generate images from text prompts using a Stable Diffusion endpoint.

Key Changes:

• Added image generation functionality via new isImageGeneration prop
• Implemented generateImage function to handle image generation requests
• Added loading state for image generation process
• Modified message handling to support generated image attachments
• Added visual indicator for image generation feature

Checklist:

• Documentation
• Test case: Verify image generation with sample prompt
• Test case: Verify loading states during generation
• Test case: Verify error handling for failed requests

Review Requirements:

• Endpoint: https://stable-diffusion-3m.asia03.app.backend.ai/generate-image
• Access key configuration required for image generation
• Verify base64 image rendering in chat interface

[agatha197]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat: call generate image API if isImageGeneration is true. #3001 👈 (View in Graphite)
• add(FR-261): draft for model player UI derived from WebUI #2878 : 1 other dependent PR (#3275 )
• main

---

How to use the Graphite Merge Queue

Add either label to this PR to merge it via the merge queue:

• flow:merge-queue - adds this PR to the back of the merge queue
• flow:hotfix - for urgent hot fixes, skip the queue and merge this PR next

You must have a Graphite account in order to use the merge queue. Sign up using this link.

An organization admin has required the Graphite Merge Queue in this repository.

Please do not merge from GitHub as this will restart CI on PRs being processed by the merge queue.

This stack of pull requests is managed by Graphite. Learn more about stacking.