Simplify the public event and CPU API

Applications now need far less ceremony: hello.c is a 20-line loop that
handles REFRESH, CLOSE and QUIT and draws into the surface's own pixels.

- Fold GEOMETRY, STATE and FOCUS into one WINDOW event carrying size,
  scale and state; unchanged values send nothing.
- Guarantee REFRESH once a window has a size and after every resize,
  never at size zero.
- Merge DROP_HOVER into DROP with over/leave/data actions and give drag
  and drop actions enums.
- Keep event strings valid until the next wait and drop
  yasl_event_release; empty or failed waits report NONE.
- Replace copy-in presentation with a lent pixel buffer:
  yasl_cpu_pixels and yasl_cpu_present.
- Remove yasl_poll_event, yasl_cpu_read_pixels, unused event fields and
  comments that restated names.
- Wayland: resize floating windows in request_size instead of reporting
  it unsupported, and stop marking new GPU surfaces as Vulkan so
  yasl_vulkan_create_surface no longer fails with NATIVE_WINDOW_IN_USE.

Also includes the in-progress public API refactor that was uncommitted
in the tree (removal of the app/loop layer, new surface, GL and Vulkan
entry points).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/common/keyboard.h b/src/common/keyboard.h
index d8b8bbc..ce144fb 100644
--- a/src/common/keyboard.h
+++ b/src/common/keyboard.h
@@ -1,10 +1,10 @@
-#ifndef YASL_COMMON_KEYBOARD_H
-#define YASL_COMMON_KEYBOARD_H
+#ifndef YASL_PRIVATE_COMMON_KEYBOARD_H
+#define YASL_PRIVATE_COMMON_KEYBOARD_H
 
 #include <stdint.h>
 
 /* Layout labels omit controls, invalid Unicode, and Cocoa function-key PUA. */
-static inline uint32_t yasl_key_label(uint32_t cp)
+static inline uint32_t yasl_private_key_label(uint32_t cp)
 {
     return cp >= 0x20 && cp != 0x7f && cp <= 0x10ffff &&
         !(cp >= 0x80 && cp <= 0x9f) && !(cp >= 0xd800 && cp <= 0xdfff) &&