Centralize legacy video export bridge

docs/modernization/roadmap.md

@@ -758,6 +758,12 @@ named export work through app-core document export executors and
 directory creation, picker-selected stems, Web prepared-file handoff, and legacy
 `Canvas` export calls while retained execution remains tracked under
 `DEBT-0043`.
+`App::dialog_timelapse_export` and `App::dialog_export_mp4` now route
+picker-selected MP4 export paths through the app-core document video export
+executor and `src/legacy_document_export_services.*`, preserving mobile/Web
+suggested-name save callbacks, desktop worker-thread timelapse export,
+`App::rec_export`, animation `Canvas::export_anim_mp4` dispatch, and existing
+success messages while retained execution remains tracked under `DEBT-0044`.
 
 Implementation tasks:
 
@@ -1330,6 +1336,15 @@ Results:
 - Focused export CTest coverage passed for `pp_app_core_document_export_tests`,
   `pano_cli_plan_export_start/menu/target_*`, and
   `pano_cli_simulate_document_export_smoke` after the live bridge split.
+- `PanoPainter`, `pp_app_core_document_export_tests`, and `pano_cli` built
+  after timelapse and animation MP4 export execution moved behind document
+  video export services. A clean rebuild was required once because MSVC
+  reported the known Debug PDB `LNK1103` corruption, after which the app,
+  export tests, and `pano_cli` targets built cleanly.
+- Focused video export CTest coverage passed for
+  `pp_app_core_document_export_tests`, `pano_cli_plan_export_menu_*`,
+  `pano_cli_plan_export_target_name_smoke`, and
+  `pano_cli_simulate_document_export_smoke`.
 - `pp_app_core_document_recording_tests` passed, covering recording start/stop,
   clear, platform recorded-file cleanup, frame-count reset, export progress
   totals, and oversized progress-total clamping.