Expand ecash explorer capabilities

Add Fedimint discovery, dual SQLite/Postgres storage, richer review handling, and generated social imagery.

web/src/i18n/format.ts

@@ -77,6 +77,8 @@ export interface Formatters {
   serverTime(unix: number): string;
   /** Grouped: 1,000,000 in English, 1.000.000 in Spanish and Dutch. */
   number(n: number): string;
+  /** Compact: "500K" / "500 mil", for a limit quoted inside a meta description. */
+  compact(n: number): string;
   /** A rating to one decimal, with the locale's own decimal separator. */
   decimal(n: number, digits?: number): string;
 }
@@ -159,6 +161,9 @@ export function formatters(t: Translator): Formatters {
 
     number: (n) => numberFormat(tag).format(n),
 
+    compact: (n) =>
+      new Intl.NumberFormat(tag, { notation: 'compact', maximumFractionDigits: 1 }).format(n),
+
     decimal: (n, digits = 1) =>
       new Intl.NumberFormat(tag, {
         minimumFractionDigits: digits,