feat(ee): bases

Table and kanban UI, formula engine package, and the base-embed editor extension

apps/client/src/ee/base/context/base-editable.tsx

@@ -0,0 +1,22 @@
+import { createContext, useContext, type ReactNode } from "react";
+
+const BaseEditableContext = createContext<boolean>(true);
+
+export function BaseEditableProvider({
+  editable,
+  children,
+}: {
+  editable: boolean;
+  children: ReactNode;
+}) {
+  return (
+    <BaseEditableContext.Provider value={editable}>
+      {children}
+    </BaseEditableContext.Provider>
+  );
+}
+
+/** Whether the current base subtree is editable. Defaults to true outside a provider. */
+export function useBaseEditable(): boolean {
+  return useContext(BaseEditableContext);
+}

apps/client/src/ee/base/context/grid-row-order.tsx

@@ -0,0 +1,12 @@
+import { createContext, useContext } from "react";
+
+// Row order is only needed at interaction time (shift-select range math), so
+// rows subscribe to a stable getter instead of the array itself — appending a
+// page must not re-render every mounted row.
+const GridRowOrderContext = createContext<() => string[]>(() => []);
+
+export const GridRowOrderProvider = GridRowOrderContext.Provider;
+
+export function useGridRowOrder(): () => string[] {
+  return useContext(GridRowOrderContext);
+}

apps/client/src/ee/base/context/row-expand.tsx

@@ -0,0 +1,11 @@
+import { createContext, useContext } from "react";
+
+// Rows only need the handler at click time; a stable context value keeps the
+// expand affordance out of every GridRow/GridCell memo equality check.
+const RowExpandContext = createContext<((rowId: string) => void) | null>(null);
+
+export const RowExpandProvider = RowExpandContext.Provider;
+
+export function useRowExpand(): ((rowId: string) => void) | null {
+  return useContext(RowExpandContext);
+}