feat(bases): add kanban view config fields to schema

apps/client/src/features/base/types/base.types.ts

@@ -154,6 +154,8 @@ export type SearchSpec = {
   mode?: 'trgm' | 'fts';
 };
 
+export const NO_VALUE_CHOICE_ID = '__no_value';
+
 export type ViewConfig = {
   sorts?: ViewSortConfig[];
   filter?: FilterGroup;
@@ -161,6 +163,10 @@ export type ViewConfig = {
   hiddenPropertyIds?: string[];
   propertyWidths?: Record<string, number>;
   propertyOrder?: string[];
+  // Kanban
+  groupByPropertyId?: string;
+  hiddenChoiceIds?: string[];
+  choiceOrder?: string[];
 };
 
 export type IBaseView = {

apps/server/src/core/base/base.schemas.ts

@@ -410,6 +410,8 @@ const viewFilterGroupSchema: z.ZodType<ViewFilterGroup> = z.lazy(() =>
   }),
 );
 
+export const NO_VALUE_CHOICE_ID = '__no_value';
+
 export const viewConfigSchema = z
   .object({
     sorts: z.array(viewSortSchema).optional(),
@@ -418,6 +420,12 @@ export const viewConfigSchema = z
     hiddenPropertyIds: z.array(z.uuid()).optional(),
     propertyWidths: z.record(z.string(), z.number().positive()).optional(),
     propertyOrder: z.array(z.uuid()).optional(),
+    // Kanban-only fields. `hiddenChoiceIds` and `choiceOrder` accept
+    // `z.string()` (not `z.uuid()`) because the NO_VALUE_CHOICE_ID
+    // sentinel ('__no_value') lives in the same array as choice uuids.
+    groupByPropertyId: z.uuid().optional(),
+    hiddenChoiceIds: z.array(z.string()).optional(),
+    choiceOrder: z.array(z.string()).optional(),
   })
   .passthrough();