fix: drive refresh from wayland events (#332)

* fix: drive refresh from wayland events

Move refresh/message processing into the main event loop so frame callbacks and Wayland events can trigger redraws immediately instead of being gated by fixed 50ms timer.

- layershellev: process pending messages, return data, closes, and refresh requests on each run tick after roundtrip
- sessionlockev: mirror for parity

* fix: typo

Author: httpsworldview