Tasks: split T43 into three

tasks/ch31-43.md

@@ -352,14 +352,20 @@
 - [x] ImportDialog — field mapping → `misc::ImportDialog`: a Select of the columns for each field, matched by name to start, over a preview of the first rows; Import asks for each required field's column
 - [x] CSVImporter → `misc::CsvImporter`: CSV read as RFC 4180 (`misc::read_csv`), its first row naming the columns unless the box says otherwise, mapped through the ImportDialog into records; text that does not read says why
 
-## T43 Library Tooling — `src/tooling`
+## T43a Tooling · Workbench — `src/tooling`
 
 - [ ] ComponentGallery / Storybook
 - [ ] PlaygroundPanel
+
+## T43b Tooling · Inspection
+
 - [ ] InspectorOverlay
 - [ ] FPSMeter / PerfOverlay
 - [ ] RenderCounter
 - [ ] EventLogger
+
+## T43c Tooling · Catalogs
+
 - [ ] DesignTokenViewer
 - [ ] IconBrowser
 - [ ] A11yChecker — contrast audit