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/sse/services/model.js

@@ -33,6 +33,13 @@ export async function getModelInfo(modelStr) {
       if (matchedAnthropic) {
         return { provider: matchedAnthropic.id, model: parsed.model };
       }
+
+      // Check Custom Embedding nodes
+      const embeddingNodes = await getProviderNodes({ type: "custom-embedding" });
+      const matchedEmbedding = embeddingNodes.find((node) => node.prefix === parsed.providerAlias);
+      if (matchedEmbedding) {
+        return { provider: matchedEmbedding.id, model: parsed.model };
+      }
     }
     return {
       provider: parsed.provider,