fix: place OpenCode model variants at top level instead of inside options (#1317)

Split the expanded model panel into two editing areas:
- "Model Properties" for top-level fields (variants, cost, etc.)
- "SDK Options" for model.options fields (provider routing, etc.)

Also guard against renaming extra fields to reserved keys (name, limit,
options) or duplicate names, and fix ModelOptionKeyInput blur desync when
a rename is rejected by the parent handler.

src/components/providers/forms/helpers/opencodeFormUtils.ts

@@ -109,6 +109,26 @@ export function parseOpencodeConfigStrict(
   };
 }
 
+export const OPENCODE_KNOWN_MODEL_KEYS = ["name", "limit", "options"] as const;
+
+export function isKnownModelKey(key: string): boolean {
+  return OPENCODE_KNOWN_MODEL_KEYS.includes(
+    key as (typeof OPENCODE_KNOWN_MODEL_KEYS)[number],
+  );
+}
+
+export function getModelExtraFields(
+  model: OpenCodeModel,
+): Record<string, string> {
+  const extra: Record<string, string> = {};
+  for (const [k, v] of Object.entries(model)) {
+    if (!isKnownModelKey(k)) {
+      extra[k] = typeof v === "string" ? v : JSON.stringify(v);
+    }
+  }
+  return extra;
+}
+
 export function toOpencodeExtraOptions(
   options: OpenCodeProviderConfig["options"],
 ): Record<string, string> {