Fix: prevent back to auth on eID Wallet

infrastructure/eid-wallet/src/routes/(auth)/+layout.svelte

@@ -0,0 +1,66 @@
+<script lang="ts">
+import { goto } from "$app/navigation";
+import { page } from "$app/state";
+import type { GlobalState } from "$lib/global";
+import { getContext, onMount } from "svelte";
+
+let { children } = $props();
+let isChecking = $state(true);
+let vaultExists = $state(false);
+let guardFailed = $state(false);
+
+const getGlobalState = getContext<() => GlobalState>("globalState");
+
+onMount(async () => {
+    try {
+        const globalState = getGlobalState();
+        if (!globalState) {
+            console.error("Global state is not defined");
+            guardFailed = true;
+            return;
+        }
+
+        // Check if user is already authenticated
+        const vault = await globalState.vaultController.vault;
+        if (vault) {
+            vaultExists = true;
+            console.log("User already authenticated, redirecting to main");
+            // Use replaceState to prevent infinite back loops
+            await goto("/main", { replaceState: true });
+            return;
+        }
+
+        if (globalState.isOnboardingComplete) {
+            const pinHash = await globalState.securityController.pinHash;
+            const isAlreadyAtLogin = page.url.pathname === "/login";
+
+            if (pinHash && !isAlreadyAtLogin) {
+                console.log(
+                    "Onboarding already complete, redirecting to login",
+                );
+                await goto("/login", { replaceState: true });
+                return;
+            }
+        }
+    } catch (error) {
+        console.error("Error in auth layout guard:", error);
+        guardFailed = true;
+    } finally {
+        isChecking = false;
+    }
+});
+</script>
+
+{#if isChecking}
+    <div class="h-screen w-screen bg-background"></div>
+{:else if guardFailed}
+    <div
+        class="flex h-screen w-screen items-center justify-center bg-background"
+    >
+        <p class="text-center text-sm text-foreground-muted">
+            An unexpected error occurred. Please restart the application.
+        </p>
+    </div>
+{:else if !vaultExists}
+    {@render children()}
+{/if}