Preserve focus inside grid editors

src/frontend/components/circuit-tree-editor.tsx

@@ -27,6 +27,7 @@ import {
   deviceFieldKeys,
   formatPhaseTypeLabel,
   formatValue,
+  isGridEditorControlTarget,
 } from "../utils/circuit-grid-model";
 import {
   buildCircuitDeviceRowInsertSnapshot,
@@ -3398,6 +3399,9 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
                           setCircuitReorderIntent(null);
                         }}
                         onClick={(event) => {
+                          if (isGridEditorControlTarget(event.target)) {
+                            return;
+                          }
                           if (cell.editable) {
                             handleRowSelectionClick(row, column.key, {
                               ctrlKey: event.ctrlKey,
@@ -3406,7 +3410,10 @@ export function CircuitTreeEditor(props: { projectId: string; circuitListId: str
                             });
                           }
                         }}
-                        onDoubleClick={() => {
+                        onDoubleClick={(event) => {
+                          if (isGridEditorControlTarget(event.target)) {
+                            return;
+                          }
                           if (cell.editable) {
                             startEdit({ rowKey: row.rowKey, cellKey: column.key }, "selectExisting");
                           }

src/frontend/utils/circuit-grid-model.ts

@@ -230,6 +230,18 @@ export function formatPhaseTypeLabel(value: string): string {
   return value;
 }
 
+export function isGridEditorControlTarget(target: unknown): boolean {
+  if (
+    target === null ||
+    typeof target !== "object" ||
+    !("closest" in target) ||
+    typeof target.closest !== "function"
+  ) {
+    return false;
+  }
+  return Boolean(target.closest("input, select, textarea"));
+}
+
 export function parseNumeric(cellKey: CellKey, draft: string): number | undefined {
   const trimmed = draft.trim();
   if (trimmed === "") {