Route dialog work directory picker through platform services

docs/modernization/build-inventory.md

@@ -552,8 +552,9 @@ Known local toolchain state:
   render-target binding hooks, render platform hint hooks, render-capture frame
   hooks, render debug callback hooks, per-frame platform hooks, picker
   callbacks, recording cleanup, exported-image publishing, persistent storage
-  flushing, document browse roots, native UI/window state saving, live
-  asset/layout reload policy, diagnostic stacktrace/crash hooks,
+  flushing, document browse roots, working-directory picker policy and
+  display-path formatting, native UI/window state saving, live asset/layout
+  reload policy, diagnostic stacktrace/crash hooks,
   SonarPen availability/startup, PPBR export data-directory policy,
   prepared-file writable target selection, network TLS verification policy, and
   prepared-file save/download handoff; PPBR
@@ -613,6 +614,10 @@ Known local toolchain state:
   app-close, save, save-as, save-version, and save-before-workflow decisions
   as JSON and is covered for clean, dirty, already-prompting, missing-canvas,
   new-document, save-as, save-version, and dirty-save-version states.
+- Save, New Document, and Browse dialogs now use `PlatformServices` for
+  working-directory picker availability and displayed absolute-path formatting,
+  so `src/node_dialog_open.cpp` and `src/node_dialog_browse.cpp` no longer own
+  desktop-only path picker branches.
 - `pp_app_core_document_route_tests` covers the app document-open route
   contract for PPI/project files, ABR imports, PPBR imports, inner-dot names,
   and malformed paths before the live `App::open_document` performs UI or