[client] evdev: fix input capture and device handling

Classify configured devices by keyboard and pointer capability so
automatic keyboard capture leaves relative pointer devices with the
display server.

Run descriptor, grab, physical-state, and LED operations on one worker.
Marshal normalized events through each display server's event loop and
serialize ownership changes with per-lane barriers.

Fall back whole lanes to native input when an evdev cohort cannot be
owned, and retry missing or removed devices without disabling the rest.

Handle report framing, SYN_DROPPED, high-resolution wheels, queue
overflow, held-state cleanup, and guest-driven keyboard LEDs. Restore
host LEDs and kernel grabs during teardown.

Re-evaluate capture when the active input transport changes.

client/tests/mouse_test.c

@@ -282,6 +282,12 @@ void app_mouseTrace(const char * file, unsigned int line,
   (void)format;
 }
 
+void evdev_setGrab(bool keyboard, bool pointer)
+{
+  (void)keyboard;
+  (void)pointer;
+}
+
 static bool inputSupports(void * opaque, LG_InputSupport support)
 {
   return support == LG_INPUT_SUPPORT_MOUSE_ABSOLUTE &&