Thin app runtime and generic node shells

docs/modernization/tasks.md

@@ -590,6 +590,11 @@ Current slice:
   keeping that shell pocket inline in `src/app.cpp`, which trims the live app
   entry file a little further while preserving the retained open-action
   behavior.
+- `App::show_progress(...)`, `App::message_box(...)`, and
+  `App::input_box(...)` now also route through
+  `src/legacy_app_dialog_services.*` instead of building dialog plans and
+  factories inline in `src/app_dialogs.cpp`, which trims another coherent
+  dialog-construction pocket from the remaining app dialog shell.
 
 Write scope:
 - `src/app_dialogs.cpp`
@@ -651,6 +656,11 @@ Current slice:
   live in `src/legacy_app_runtime_shell_services.cpp` instead of staying
   inline in `src/app.cpp`, which reduces the remaining app file to a thinner
   retained shell around document routing and runtime thread entrypoints.
+- `App::request_close()`, `App::renderdoc_frame_start()`,
+  `App::renderdoc_frame_end()`, and the render/UI thread entrypoint wrappers
+  now also route through `src/legacy_app_runtime_shell_services.*` instead of
+  staying inline in `src/app.cpp`, which reduces the live app file to a much
+  thinner retained composition shell.
 
 Write scope:
 - `src/app.cpp`
@@ -754,6 +764,10 @@ Current slice:
 - canvas async import/export/save/open background work now also runs through an
   `AppRuntime`-owned worker queue instead of a retained static worker in
   `src/canvas.cpp`
+- `App::request_close()` plus the render/UI thread entrypoint wrappers now
+  also route through `src/legacy_app_runtime_shell_services.*`, which further
+  reduces direct runtime orchestration living on `src/app.cpp` even though the
+  owned runtime contract is still centered on `AppRuntime`
 - retained `App` composition, task call sites, and platform/runtime entrypoint
   coupling are still not fully reduced behind the runtime contract
 
@@ -916,6 +930,11 @@ Current slice:
   `load_legacy_ui_node(...)` in `src/legacy_ui_node_loader.*`, which moves the
   init/attribute-parse/create/child-load/loaded shell out of `src/node.cpp`
   and leaves the remaining live node file thinner.
+- The remaining default `Node` event/capture/resize shell now also lives in
+  `src/legacy_ui_node_execution.cpp`, while the remaining
+  width/height/padding/margin/flex/visibility/geometry wrappers now also live
+  in `src/legacy_ui_node_style.*`, which reduces `src/node.cpp` to the final
+  attribute/load entrypoints without changing the public surface.
 
 Write scope:
 - `src/node.cpp`