feat(recurring): carry dimension bags on recurring invoice schedules (#1272)

Schedules and their template items now store {sie_dim_no: code} bags
(default_dimensions / dimensions), and the cron generator copies them
onto every spawned invoice + item, so recurring invoices book with the
same projekt/kostnadsstalle tags a manual invoice would. Wired through
the web CRUD routes, the staged-operation executors, and the MCP
create/update/list schedule tools (resolve-don't-select, resolutions
echoed in the preview).

Migration 20260728090000 adds the two jsonb columns (same shape+CHECK
as invoices/invoice_items, PR7 producer parity).

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

lib/api/schemas.ts

@@ -707,6 +707,9 @@ export const RecurringScheduleItemSchema = z.object({
     .union([z.literal(0), z.literal(6), z.literal(12), z.literal(25)])
     .nullable()
     .optional(),
+  // Copied onto the generated invoice_items.dimensions; merges over the
+  // schedule's default_dimensions on that item's revenue line.
+  dimensions: DimensionsBagSchema.optional(),
 })
 
 export const CreateRecurringScheduleSchema = z.object({
@@ -721,6 +724,8 @@ export const CreateRecurringScheduleSchema = z.object({
   our_reference: z.string().optional(),
   notes: z.string().optional(),
   auto_send: z.boolean().default(false),
+  // Copied onto invoices.default_dimensions for every generated invoice.
+  default_dimensions: DimensionsBagSchema.optional(),
   // Optional: when to first run. Defaults to next occurrence of day_of_month
   // (today if day_of_month === today, otherwise next month).
   start_date: isoDate.optional(),
@@ -739,6 +744,8 @@ export const UpdateRecurringScheduleSchema = z.object({
   notes: z.string().nullable().optional(),
   auto_send: z.boolean().optional(),
   status: z.enum(['active', 'paused']).optional(),
+  // Replaces the whole bag if provided ({} clears all tags). Omit to keep.
+  default_dimensions: DimensionsBagSchema.optional(),
   // Replace all items if provided. Omit to keep existing items unchanged.
   items: z.array(RecurringScheduleItemSchema).min(1).optional(),
 })