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/app/providers/RouterProvider.tsx

@@ -16,6 +16,7 @@ import { PolitikaCookiePage } from '@pages/politika-cookie'
 import { SoglasiePage } from '@pages/soglasie-personalnyh-dannyh'
 import { ReestryPage } from '@pages/reestr-pd-rkn'
 import { TransactionsPage } from '@pages/transactions'
+import { WalletLayout } from '@widgets/wallet-layout'
 import { ROUTES } from '@shared/config/routes'
 import { ScrollToTop } from './ScrollToTop'
 import { ProtectedRoute } from './ProtectedRoute'
@@ -40,15 +41,21 @@ export function RouterProvider() {
         </Route>
 
         <Route element={<ProtectedRoute />}>
-          <Route path={ROUTES.CONVERTER} element={<ConverterPage />} />
+          <Route element={<WalletLayout footer center />}>
+            <Route path={ROUTES.CONVERTER} element={<ConverterPage />} />
+          </Route>
+
+          <Route element={<WalletLayout footer />}>
+            <Route path={ROUTES.SWAP} element={<SwapPage />} />
+            <Route path={ROUTES.BRIDGE} element={<BridgePage />} />
+            <Route path={ROUTES.TRANSACTIONS} element={<TransactionsPage />} />
+          </Route>
+
           <Route path={ROUTES.WALLET} element={<WalletPage />} />
           <Route path={ROUTES.WALLET_CHAIN} element={<WalletPage />} />
-          <Route path={ROUTES.SWAP} element={<SwapPage />} />
-          <Route path={ROUTES.BRIDGE} element={<BridgePage />} />
           <Route path={ROUTES.PROFILE} element={<ProfilePage />} />
           <Route path={ROUTES.SEED_PHRASE} element={<SeedPhrasePage />} />
           <Route path={ROUTES.KYC} element={<KycPage />} />
-          <Route path={ROUTES.TRANSACTIONS} element={<TransactionsPage />} />
         </Route>
       </Routes>
     </BrowserRouter>