feat(accounts): merchants and payers as a league table

Expense and revenue accounts list this month per currency, share,
visits, average, twelve months, typical and the change against it, last
visit and category; quiet ones fold into one line behind i. 1 to 5 sort,
; groups by category with subtotals, x and s c set the category on all
of a merchant's transactions in the period.

src/routes/accounts/[type=accounttype]/+page.svelte

@@ -2,6 +2,7 @@
   import type { AccountType } from "#lib/api/types.js";
   import AccountsIndex from "#lib/components/accounts/AccountsIndex.svelte";
   import Ledger from "#lib/components/accounts/Ledger.svelte";
+  import Merchants from "#lib/components/accounts/Merchants.svelte";
   import { page } from "$app/state";
 
   const type = $derived(page.params.type as AccountType);
@@ -10,6 +11,8 @@
 {#key type}
   {#if type === "liabilities"}
     <Ledger />
+  {:else if type === "expense" || type === "revenue"}
+    <Merchants kind={type} />
   {:else}
     <AccountsIndex {type} />
   {/if}