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/swap/ui/SwapPage.module.css

@@ -1,52 +1,12 @@
-.page {
-    display: flex;
-    flex-direction: column;
-    min-height: 100vh;
-    background: var(--bg-deep);
-}
-
-.tabs {
-    display: flex;
-    gap: 8px;
-    padding: 24px 28px 0;
-}
-
-.tab {
-    padding: 10px 24px;
-    border-radius: 10px;
-    font-size: 14px;
-    font-weight: 700;
-    cursor: pointer;
-    border: none;
-    font-family: var(--font-sans);
-    letter-spacing: 0.5px;
-    transition: all 0.2s;
-}
-
-.active {
-    background: linear-gradient(135deg, var(--grad-edge), var(--grad-center));
-    color: var(--text-primary);
-}
-
-.inactive {
-    background: rgba(255, 255, 255, 0.06);
-    color: var(--text-secondary);
-}
-
-.inactive:hover {
-    color: var(--text-primary);
-}
-
-.main {
-    flex: 1;
-    display: flex;
-    flex-direction: column;
-    align-items: center;
-    padding: 32px 20px 48px;
+.content {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 32px 20px 48px;
 }
 
 @media (max-width: 650px) {
-    .main {
-        padding: 32px 20px;
-    }
-}
+  .content {
+    padding: 32px 20px;
+  }
+}