feat(wallet): Refactor wallet service for enhanced modularity and clarity

- Abstracted RPC interface to allow dynamic input for connection flexibility.
- Added `signSession` function to retrieve `authSig` efficiently.
- Improved logging and error handling to provide clearer feedback.
- Centralized `authSig` retrieval for better code maintainability.

This refactor ensures the wallet service is more adaptable to varying use cases and improves overall code readability.

src/routes/+page.svelte

@@ -7,14 +7,20 @@
 				"login",
 				"main"
 				"footer";
-			grid-template-rows: 150px 1fr auto;
+			grid-template-rows: 1fr 1fr auto;
 		`,
 		children: [
 			{
 				id: 1,
 				componentName: 'Login',
 				props: {},
-				slot: 'login'
+				slot: 'login',
+				children: [
+					{
+						id: 5,
+						componentName: 'Wallet'
+					}
+				]
 			},
 			{
 				id: 2,