feat: img gen

[lollipopkit]

Fixes #262

Summary by Sourcery

Update the image generation process to provide immediate visual feedback and ensure reliable UI state management.

Bug Fixes:

• Ensure UI state cleanup (loading indicator, auto-hide toggle) executes reliably after image generation completes, whether successful or not.

Enhancements:

• Display an assistant message placeholder immediately when image generation begins.
• Improve UI responsiveness during image generation, including loading indicators and auto-scrolling.
• Trigger data synchronization only after successful image generation.
• Refactor sync button callback for minor code clarity.

Chores:

• Update openai_dart and fl_lib dependencies to newer versions.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request implements the image generation feature. It includes the core logic for creating images, managing UI states during the process, handling errors, adding generated images to the chat history, and updating relevant dependencies. A minor refactor to a UI callback is also included.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Adds the core functionality for generating images from user prompts.	Adds an initial placeholder message for the assistant. Manages loading states and UI auto-hide during the image creation process. Integrates with the image creation API. Populates the placeholder message with generated images upon success. Includes error handling and cleanup for loading states. Adds auto-scrolling behavior. Triggers a data sync after successful image generation.	lib/view/page/home/req.dart
Updates critical library dependencies.	Bumps the version of the openai_dart package. Bumps the version of the fl_lib package. Removes an unnecessary dependency override.	pubspec.yaml pubspec.lock
Simplifies the signature of the sync button's event handler.	Removes an unused context parameter from the handler function. Updates the button's callback to match the new signature.	lib/view/page/home/bottom/bottom.dart

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#262	Implement image generation functionality.	✅

Possibly linked issues

• feat: img gen #262: The PR implements the image generation feature described in the issue and explicitly links to it.

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[sourcery-ai]

Hey @lollipopkit - I've reviewed your changes - here's some feedback:

Overall Comments:

• The finally block in _onCreateImg appears to duplicate cleanup logic handled by _onErr in the catch block; consider removing the finally block.
• Consider whether notifying the UI and scrolling twice in _onCreateImg (once for the empty message, once after adding images) is necessary or if a single update after image generation suffices.

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

question: Revisit adding an empty assist reply before the async call.

Since assistReply is added to workingChat.items before initiating the image creation, if the request fails the empty entry remains. Consider whether it should be removed or marked as failed so that the chat history remains consistent.