fix: support slash-containing model IDs (#1074)

* fix: support slash-containing model IDs

* fix: parse worktree default model identifiers

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/lib/modelIdentifier.ts

@@ -0,0 +1,20 @@
+export interface ParsedModelIdentifier {
+  providerId: string;
+  modelId: string;
+}
+
+export const parseModelIdentifier = (value: string | undefined): ParsedModelIdentifier | null => {
+  if (!value) {
+    return null;
+  }
+
+  const separatorIndex = value.indexOf('/');
+  if (separatorIndex <= 0 || separatorIndex >= value.length - 1) {
+    return null;
+  }
+
+  return {
+    providerId: value.slice(0, separatorIndex),
+    modelId: value.slice(separatorIndex + 1),
+  };
+};