fix(ui): external adapter selection, config field placement, and transcript parser freshness

- Fix external adapters (hermes, droid) not auto-selected when
  navigating with ?adapterType= param — was using a stale
  module-level Set built before async adapter registration
- Move SchemaConfigFields to render after thinking effort (same
  visual area as Claude's chrome toggle) instead of bottom of
  config section
- Extract SelectField into its own component to fix React hooks
  order violation when schema fields change between renders
- Add onAdapterChange() subscription in registry.ts so
  registerUIAdapter() notifies components when dynamic parsers
  load, fixing stale parser for old runs
- Add parserTick to both RunTranscriptView and
  useLiveRunTranscripts to force recomputation on parser change

ui/src/adapters/index.ts

@@ -5,6 +5,7 @@ export {
   registerUIAdapter,
   unregisterUIAdapter,
   syncExternalAdapters,
+  onAdapterChange,
 } from "./registry";
 export { buildTranscript } from "./transcript";
 export type {