feat(reports): a year board per currency instead of the generator

/reports opens the year: per currency spent so far, a typical month and
this month against typical by today, one lane of category columns per
currency with a dotted typical line and income as dots, what grew next
to the month under the cursor, an honest by-currency table and net worth
lanes weighted by size. Arrows move the month, Enter opens its
transactions, [ ] change the year, m shows the old tables, ?view=month
pins a month with the money flow. Old report URLs still work.

Shared pieces for other pages: Lanes, ledgerQuery for twelve months,
typical-month helpers.

src/lib/components/reports/CurrencySwitch.svelte

@@ -0,0 +1,26 @@
+<script lang="ts">
+  import {
+    modeLabel,
+    navigate,
+    useReport,
+  } from "#lib/reports/report.svelte.js";
+
+  const report = useReport();
+</script>
+
+{#if report.available.length > 1}
+  <div class="flex items-center gap-3 text-[12px]">
+    {#each report.available as mode (mode)}
+      <button
+        aria-pressed={report.mode === mode}
+        class={report.mode === mode
+          ? "font-semibold text-cladd-fg"
+          : "text-brand hover:underline dark:text-[var(--ff-series-1)]"}
+        onclick={() => navigate({ cur: mode })}
+        type="button"
+      >
+        {modeLabel(mode)}
+      </button>
+    {/each}
+  </div>
+{/if}