Extract brush package import targets

docs/modernization/build-inventory.md

@@ -656,13 +656,16 @@ Known local toolchain state:
   asset/storage/UI/platform ownership is tracked by `DEBT-0047`.
 - `src/assets/brush_package.*` owns the first headless PPBR package helpers:
   header validation, legacy-compatible version acceptance, export path
-  normalization, and preview-data-directory planning. Live
-  `NodePanelBrushPreset::export_ppbr`/`import_ppbr` consumes these helpers, but
-  legacy Serializer/Image payload parsing, preview rendering, preset storage,
-  and strict-version cleanup remain tracked by `DEBT-0047` and `DEBT-0049`.
+  normalization, preview-data-directory planning, and imported brush
+  tip/pattern image target paths. Live
+  `NodePanelBrushPreset::export_ppbr`/`import_ppbr` and ABR import image writes
+  consume these helpers, but legacy Serializer/Image payload parsing, preview
+  rendering, preset storage, duplicate policy, and strict-version cleanup remain
+  tracked by `DEBT-0047`, `DEBT-0048`, and `DEBT-0049`.
 - `pp_assets_brush_package_tests` covers PPBR header parsing, truncated/bad
   magic rejection, legacy version tolerance, export package/data path planning,
-  legacy extension containment, and paths the legacy regex could not match.
+  legacy extension containment, paths the legacy regex could not match, brush
+  tip/pattern image target planning, and invalid imported image target inputs.
 - `pp_app_core_brush_package_export_tests` covers PPBR export request path
   validation, metadata preservation, legacy-flexible destination/export-data
   combinations, service dispatch, and malformed request rejection without