feat: work-in-progress limits and swimlanes on the board

Each status can carry a WIP limit in the project settings; the board shows
it next to the count, marks a column that goes over it and says so when a
card is dropped there. The board can also be grouped in rows by person,
epic, priority or type, remembered per browser.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/presenters/src/lib/graphql/inputs.ts

@@ -425,6 +425,15 @@ export class WorkflowStatusInput {
   @Field() @IsString() color!: string;
   @Field({ defaultValue: false }) @IsBoolean() requiresReason!: boolean;
   @Field({ defaultValue: false }) @IsBoolean() archived!: boolean;
+  @Field(() => Int, {
+    nullable: true,
+    description: 'Work-in-progress limit (null: none)',
+  })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  @Max(999)
+  wipLimit?: number | null;
 }
 
 @InputType()