feat(budgets): top line per currency, sorting places into budgets, projections

Budgets show budgeted, left, spent and spent without a budget per
currency, safe per day and where the month ends. t sorts expenses
without a budget by place, 1 to 9 move a whole place into a budget, u
undoes, and the editor and quick entry remember the place. A suggests
empty amounts from three months. Categories get the same sorting.

src/lib/components/budgets/period-path.svelte.ts

@@ -7,6 +7,14 @@ export function periodPath(base: string, start: string, end: string) {
   return `${base}/${start}/${end}?start=${start}&end=${end}`;
 }
 
+export function keptParams() {
+  const params = new URLSearchParams(page.url.search);
+  params.delete("start");
+  params.delete("end");
+  const rest = params.toString();
+  return rest ? `&${rest}` : "";
+}
+
 export function usePeriodPath(base: () => string) {
   $effect(() => {
     const { start, end } = page.params;
@@ -25,7 +33,9 @@ export function usePeriodPath(base: () => string) {
         const target = base();
         setTimeout(() => {
           if (page.url.pathname.startsWith(`${target}/${from}`)) {
-            goto(periodPath(target, start, end), { replace: true });
+            goto(`${periodPath(target, start, end)}${keptParams()}`, {
+              replace: true,
+            });
           }
         });
       }