fix: lazy-load @reown/appkit to reduce initial bundle size

[jfstn]

Description

As a Stacks Connect consumer, @reown/appkit and its dependency tree (~1.7MB including Lit UI components) are eagerly loaded via top-level imports even if WalletConnect is never used. This causes unnecessary bundle bloat and Lit SSR warnings ("Multiple versions of Lit loaded", "Lit is in dev mode") in frameworks like Next.js.

Motivation for change

Three source files had top-level import statements from @reown/appkit-universal-connector and @reown/appkit/networks. Consumer bundlers (webpack, Vite) eagerly resolve these, pulling in the full @reown/appkit tree — including Lit UI packages (appkit-ui, appkit-scaffold-ui, appkit-pay) that @stacks/connect never uses directly.

What was changed

1. request.ts — import → import type for UniversalConnectorConfig (only used as a type)
2. walletconnect/config.ts — replaced runtime @reown/appkit/networks import with inlined CAIP network objects; converted remaining imports to import type
3. walletconnect/index.ts — converted UniversalConnector to dynamic await import() inside the already-async initializeWalletConnectProvider
4. tsup.config.ts — added @reown/appkit-universal-connector and @reown/appkit to external array

How does this impact application developers

• No API changes — WalletConnect.Chains, .Networks, .Default, .initializeProvider all remain exported and unchanged
• @reown/appkit is now loaded on-demand only when WalletConnect is actually used
• Eliminates Lit SSR warnings in Next.js and similar frameworks

Before / After

ESM bundle (dist/index.mjs):

	Top-level @reown imports	Dynamic import()
Before	from'@reown/appkit-universal-connector', from'@reown/appkit/networks'	—
After	0	import('@reown/appkit-universal-connector')

Tested with Next.js 15 consumer app:

	@reown/appkit loaded at page load	Lit warnings on page load	WalletConnect works
Before	~1.7MB (eagerly, even if WalletConnect is never used)	"Lit is in dev mode" (server) + 1 browser warning	Yes
After	0 (deferred until WalletConnect is clicked)	0 warnings	Yes

Type of Change

• New feature
• Bug fix
• API reference/documentation update
• Other

Does this introduce a breaking change?

No. All public APIs remain unchanged. The only difference is that @reown/appkit-universal-connector is loaded lazily instead of eagerly.

Are documentation updates required?

• Link to documentation updates:

No documentation updates required.

Testing information

1. npm run build — succeeds, ESM output has 0 top-level @reown imports
2. npm run test — all existing tests pass
3. npm run typecheck — passes
4. Manually tested with a Next.js 15 app using @stacks/connect — Lit warnings gone, WalletConnect QR modal works on-demand

Checklist

• Code is commented where needed
• Unit test coverage for new or modified code paths
• Changelog is updated
• Tag @janniks for review

[jannik-stacks]

Great work, thank you very much for this!