fix: show custom vision models in LLM selector and model list

Expose user-added imageToText custom models as vision-capable chat
models in the default LLM selector and /v1/models, map custom service
kinds to runtime capabilities, and keep typed filtering for
/v1/models/{kind}.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/shared/components/ModelSelectModal.js

@@ -128,7 +128,10 @@ export default function ModelSelectModal({
 
     // Filter a models[] array by kindFilter (keep only matching kind)
     const filterByKind = (models) => {
-      if (!kindFilter) return models.filter((m) => m.isPlaceholder || !getModelKind(m) || getModelKind(m) === "llm");
+      // No kindFilter means the LLM selector. Keep custom models visible because
+      // user-added models may have typed capabilities (for example imageToText)
+      // while still being valid chat/combo targets.
+      if (!kindFilter) return models.filter((m) => m.isPlaceholder || m.isCustom || !getModelKind(m) || getModelKind(m) === "llm");
       if (!TYPED_KINDS.has(kindFilter)) return models;
       return models.filter((m) => m.isPlaceholder || getModelKind(m) === kindFilter);
     };