Address code review: derive maxHistory in mock, improve JSDoc on drag constant

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

apps/console/src/__tests__/ViewConfigPanel.test.tsx

@@ -27,6 +27,7 @@ vi.mock('@object-ui/components', () => {
 
     // useConfigDraft mock — mirrors real implementation
     function useConfigDraft(source: any, options?: any) {
+        const maxHistory = options?.maxHistory ?? 50;
         const [draft, setDraft] = React.useState({ ...source });
         const [isDirty, setIsDirty] = React.useState(options?.mode === 'create');
         const pastRef = React.useRef<any[]>([]);
@@ -42,7 +43,7 @@ vi.mock('@object-ui/components', () => {
 
         const updateField = React.useCallback((field: string, value: any) => {
             setDraft((prev: any) => {
-                pastRef.current = [...pastRef.current.slice(-49), prev];
+                pastRef.current = [...pastRef.current.slice(-(maxHistory - 1)), prev];
                 futureRef.current = [];
                 return { ...prev, [field]: value };
             });

apps/console/src/utils/view-config-schema.tsx

@@ -63,7 +63,7 @@ function ExpandableWidget({ renderSummary, children }: {
 // Sortable column item — drag-to-reorder within the field selector
 // ---------------------------------------------------------------------------
 
-/** Minimum drag distance in pixels to activate column reorder */
+/** Minimum pointer movement in pixels before drag-to-reorder activates (prevents accidental drags on click) */
 const COLUMN_DRAG_ACTIVATION_DISTANCE = 5;
 
 function SortableColumnItem({ colName, label, idx, total, onToggle, onMove }: {