Enhance image and embedding provider support

- Added new image models for GPT 5.2, 5.3, and 5.4, including capabilities for text-to-image and editing.
- Updated embedding handling to include optional dimensions in requests.
- Introduced support for custom embedding providers, allowing dynamic fetching and validation of custom nodes.
- Improved image generation handling with Codex integration, including progress tracking and error handling.
- Enhanced UI components to support adding custom embeddings and displaying their status.

src/shared/components/index.js

@@ -29,6 +29,7 @@ export { default as CursorAuthModal } from "./CursorAuthModal";
 export { default as IFlowCookieModal } from "./IFlowCookieModal";
 export { default as GitLabAuthModal } from "./GitLabAuthModal";
 export { default as EditConnectionModal } from "./EditConnectionModal";
+export { default as AddCustomEmbeddingModal } from "./AddCustomEmbeddingModal";
 export { default as SegmentedControl } from "./SegmentedControl";
 export { default as Tooltip } from "./Tooltip";