fix: declare Emacs 31 native compiler dependencies

ebox-grid.el

@@ -18,6 +18,7 @@
 
 (declare-function ebox--ensure-node-id "ebox" (node))
 (declare-function ebox--ensure-region-id "ebox" (box))
+(declare-function ebox-get "ebox" (box property))
 (declare-function ebox-create "ebox" (&rest plist))
 (declare-function ebox-render "ebox-layout" (node))
 (declare-function ebox--lines-concat-horizontal "ebox" (&rest strings))

ebox-surface.el

@@ -50,6 +50,7 @@
   "Per-projection cache for selector-free computed inline styles.")
 
 (declare-function ebox--render-layout "ebox-layout" (node))
+(declare-function ebox--ensure-node-id "ebox" (node))
 (declare-function ebox-native-commit-render
                   "ebox-native-commit" (state node))
 (declare-function ebox-native-reflow-frame-fragments