perf: lazy-load UI, chain connectors, and WalletConnect - 97% initial bundle reduction

[ttarinov]

I was having a problem with integration kit to the static react project and needed to implement the lazy loadings, chunk retry logic, etc.

refs:
I've been checking some references, and wagmi have dynamic SDK imports in getProvider()), RainbowKit (sideEffects: ["reset.css.ts"], and @solana/wallet-adapter using sideEffects: false + dynamic Ledger SDK import at connect() time.

List of improuvements:

• Lazy-load the entire UI router (lottie, styled-components, qr-code-styling, all React components) via dynamic imports - loaded only when user interaction happens
• Convert default chain connectors to dynamic imports - each chain SDK loads only when its connector initializes
• Lazy-load @walletconnect/universal-provider inside initWalletConnect() instead of static top-level import
• Defer token polling and API calls until first wallet actually connects
• Add sideEffects field to package.json enabling bundler tree-shaking

Results (measured with esbuild code-splitting)
Initial entry chunk - 1,154 KB >> 34 KB
UI/Router - in entry >> 1,004 KB deferred chunk (loads on user interaction)
Chain SDKs - in entry >> separate chunks (load on connector init)
WalletConnect - in entry >> deferred (loads on WC init)
Token API calls - immediate on new HotKit() >> on first wallet connect

Tests:
tsc, verified sideEffects paths match the build output, tested wallet connect flow (connectors load on demand), tested bridge/withdraw/deposit UI (router loads on first open), tested token list appears after wallet connects (deferred polling), checked briefly that WalletConnect QR flow still works