Route app input dispatch through app core

docs/modernization/build-inventory.md

@@ -840,6 +840,10 @@ Known local toolchain state:
   visibility, main UI suppression in VR-only mode, tick layout selection,
   resize render-target/redraw projection, invalid resize rejection, and redraw
   reset planning.
+- `pp_app_core_app_input_tests` covers pointer coordinate normalization,
+  invalid pointer/gesture inputs, designer-first mouse routing, mouse-cancel
+  routing, gesture midpoint/distance/delta math, main-layout routing, key state
+  mutation intent, and VR spacebar camera-sync intent.
 - `pp_app_core_app_shutdown_tests` covers legacy shutdown cleanup staging for
   UI-state save, stroke-preview renderer shutdown, recording stop,
   texture/shader invalidation, layout unload, render-target/mesh destruction,