Unify core and runner events into struct yasl_event

The core input queue and the yasl_run() runner each had their own event
type, and the runner translated one into the other. Both now share
struct yasl_event in <yasl/yasl.h>: yasl_surface_poll_event() returns the
same events the app event callback receives, so the runner forwards them
unchanged.

Pointer input becomes POINTER_DOWN/UP/MOTION/SCROLL/LEAVE with a named
yasl_pointer_button and a motion delta computed in the input queue. TEXT,
PASTE and DROP share one text payload, scale changes fold into
WINDOW_RESIZE, and every event carries a monotonic time_ns.
yasl_surface_set_mouse_mode() is replaced by
yasl_surface_set_pointer_mode(); no backend implements relative mode yet.

The export check now only counts YASL_API declarations, so function
pointer fields returning enum yasl_app_result are not mistaken for
exports.

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

1 files changed, 18 insertions, 3 deletions

diff --git a/src/common/backend.c b/src/common/backend.c
index 3f2143d..d35d243 100644
--- a/src/common/backend.c
+++ b/src/common/backend.c
@@ -306,15 +306,30 @@ bool yasl_surface_present(struct yasl_surface *s, const struct yasl_framebuffer
     return s->display->ops->surface_present(s, fb, &clipped);
 }
 
-bool yasl_surface_input_poll(struct yasl_surface *s, struct yasl_input_event *ev)
+bool yasl_surface_poll_event(struct yasl_surface *s, struct yasl_event *ev)
 {
     if (!s || !ev)
         return false;
-    if (s->display && s->display->ops && s->display->ops->surface_input_poll)
-        return s->display->ops->surface_input_poll(s, ev);
+    if (s->display && s->display->ops && s->display->ops->surface_poll_event)
+        return s->display->ops->surface_poll_event(s, ev);
     return input_queue_pop(&s->input, ev);
 }
 
+bool yasl_surface_set_pointer_mode(struct yasl_surface *s, enum yasl_pointer_mode mode)
+{
+    if (!s || (mode != YASL_POINTER_NORMAL && mode != YASL_POINTER_RELATIVE))
+        return false;
+    if (mode == s->pointer_mode)
+        return true;
+    const struct yasl_backend_ops *ops = s->display ? s->display->ops : NULL;
+    if (!ops || !ops->surface_set_pointer_mode)
+        return mode == YASL_POINTER_NORMAL;
+    if (!ops->surface_set_pointer_mode(s, mode))
+        return false;
+    s->pointer_mode = mode;
+    return true;
+}
+
 struct yasl_geometry yasl_surface_geometry(const struct yasl_surface *s)
 {
     if (!s)