fix: resolve lint errors from phase 32/33/34 execution

Auto-fixed formatting issues and removed unused imports introduced
by background execution agents across currency, i18n, and sharing code.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/client/hooks/useCurrency.ts

@@ -1,14 +1,7 @@
 import type { Currency } from "../lib/formatters";
 import { useSetting } from "./useSettings";
 
-const VALID_CURRENCIES: Currency[] = [
-	"USD",
-	"EUR",
-	"GBP",
-	"JPY",
-	"CAD",
-	"AUD",
-];
+const VALID_CURRENCIES: Currency[] = ["USD", "EUR", "GBP", "JPY", "CAD", "AUD"];
 
 const CURRENCY_MARKET_MAP: Record<string, string> = {
 	EUR: "EU",