feat(transactions): the period as a local ledger with Excel-style filters

The list loads the whole period (or twelve months with Y) and filters it
in the browser: a text line over descriptions, notes, accounts and
amounts, dropdowns with counts per type, category, budget, account,
currency, tag and subscription, group-by with subtotals per currency,
pinned filters on 1 to 9. Possible duplicates show with a delete for the
newer one, one account adds the balance column, s s sets a subscription
and s . repeats the last mass action.

src/lib/transactions/repeat.svelte.ts

@@ -0,0 +1,5 @@
+import type { MassAction } from "./mass.js";
+
+export const lastAction = $state<{ current: MassAction | null }>({
+  current: null,
+});