fix: use explicit .js extensions for all imports

- Update all exports to use explicit .js extensions
- Reference index.js files explicitly
- Ensure consistent module resolution
- Bump version to 0.3.4

Author: vveerrgg

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nostr-websocket-utils",
-  "version": "0.3.3",
+  "version": "0.3.4",
   "description": "Robust WebSocket utilities for Nostr applications with automatic reconnection, channel-based messaging, and type-safe handlers. Features heartbeat monitoring, message queueing, and comprehensive error handling.",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

src/index.ts

@@ -13,10 +13,10 @@ export { createWSServer as createServer } from './core/nostr-server.js';
 export { getLogger } from './utils/logger.js';
 
 // Crypto operations
-export * from './crypto';
+export * from './crypto/index.js';
 
 // NIP implementations
-export * from './nips';
+export * from './nips/index.js';
 
 // Type definitions
-export * from './types';
+export * from './types/index.js';