fix: hide instructions file and show advanced fields in import adapter config

- Added hideInstructionsFile prop to AdapterConfigFieldsProps
- All adapter config-fields now conditionally hide the instructions file
  field when hideInstructionsFile is set (used during import since the
  AGENTS.md is automatically set as promptTemplate)
- Import adapter config panel now renders ClaudeLocalAdvancedFields
  (Chrome, skip permissions, max turns) when claude_local is selected

Co-Authored-By: Paperclip <noreply@paperclip.ing>

ui/src/adapters/opencode-local/config-fields.tsx

@@ -17,7 +17,9 @@ export function OpenCodeLocalConfigFields({
   config,
   eff,
   mark,
+  hideInstructionsFile,
 }: AdapterConfigFieldsProps) {
+  if (hideInstructionsFile) return null;
   return (
     <Field label="Agent instructions file" hint={instructionsFileHint}>
       <div className="flex items-center gap-2">