refactor(converter): shared page layout + reusable conversion logic/UI

Pages:
- add WalletLayout route (WalletHeader + main + Footer via <Outlet/>),
  wrap converter/swap/bridge/transactions; thin pages, drop duplicated shell CSS
- extract SwapBridgeTabs shared between swap/bridge pages

Converter reuse (FSD layers, no widget->widget imports):
- move commission tiers to entities/commission (+ CommissionTable ui)
- shared calc hook features/payment/model/useCurrencyConversion;
  useConverterSection becomes thin wrapper; HomePage Converter reuses it
- move ConvertField/DirectionSwapButton to shared/ui; delete dead useConverter

Tooling:
- add eslint.config.js (ESLint 9 flat config); fix no-explicit-any in WalletPage

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/pages/transactions/ui/TransactionsPage.tsx

@@ -1,18 +1,12 @@
-import { WalletHeader } from '@widgets/wallet-header'
-import { Footer } from '@widgets/footer'
 import { TransactionsList } from '@widgets/transactions-list'
 import styles from './TransactionsPage.module.css'
 
 export function TransactionsPage() {
   return (
-    <div className={styles.page}>
-      <WalletHeader />
-      <main className={styles.main}>
-        <div className={styles.glow} />
-        <h1 className={styles.title}>Транзакции</h1>
-        <TransactionsList />
-      </main>
-      <Footer />
+    <div className={styles.inner}>
+      <div className={styles.glow} />
+      <h1 className={styles.title}>Транзакции</h1>
+      <TransactionsList />
     </div>
   )
 }