B-UEE4-adopt-sksizer-panes-determined-ui-across-migrated-vue-apps
None of the migrated Vue apps — all under solutions/augmented/apps/ after T-C9RD: augmented-books/src-frontend, learn_web/layers, augmented_web, vimit_prototype — import any shared UI lib; each hand-rolls patterns that already have a home. Port the drag-resize/collapse split layouts (learn_web book/Layout.vue, editor/BookEditorLayout.vue, editor/ResizeHandle.vue; augmented_web files/pages/editor.vue; augmented-books common/layouts/default.vue) onto @sksizer/panes (PaneGroup/Pane/PaneDivider) + @sksizer/app-frame; confirm/picker dialogs onto @determined/ui DConfirmDialog; catalog/navbar patterns onto DCard/DRowList/DNavbar. Recurring components with no lib home (recursive tree nav, markdown/prose renderer) are extract candidates for a new shared package. Derives from the augmented-convergence audit (docs/planning/analysis/augmented-convergence.md, axis 5).