fix(auth): defer environment context fetch until token is available

frontend/src/lib/stores/environmentContext.js

@@ -4,6 +4,7 @@
 // @LAYER: UI-State
 
 import { derived, get, writable } from "svelte/store";
+import { browser } from "$app/environment";
 import { api } from "$lib/api.js";
 
 const INITIAL_STATE = {
@@ -18,12 +19,12 @@ const SELECTED_ENV_KEY = "selected_env_id";
 const contextStore = writable(INITIAL_STATE);
 
 function getStoredSelectedEnvId() {
-  if (typeof window === "undefined") return "";
+  if (!browser) return "";
   return localStorage.getItem(SELECTED_ENV_KEY) || "";
 }
 
 function persistSelectedEnvId(envId) {
-  if (typeof window === "undefined") return;
+  if (!browser) return;
   if (!envId) {
     localStorage.removeItem(SELECTED_ENV_KEY);
     return;
@@ -31,6 +32,11 @@ function persistSelectedEnvId(envId) {
   localStorage.setItem(SELECTED_ENV_KEY, envId);
 }
 
+function hasAuthToken() {
+  if (!browser) return false;
+  return Boolean(localStorage.getItem("auth_token"));
+}
+
 function resolveSelectedEnvId(environments, preferredEnvId) {
   if (!Array.isArray(environments) || environments.length === 0) return "";
   if (preferredEnvId && environments.some((env) => env.id === preferredEnvId)) {
@@ -53,6 +59,16 @@ function applySelectedEnvId(selectedEnvId) {
 }
 
 async function refreshEnvironmentContext(preferredEnvId = "") {
+  if (!hasAuthToken()) {
+    contextStore.update((state) => ({
+      ...state,
+      isLoading: false,
+      isLoaded: false,
+      error: null,
+    }));
+    return;
+  }
+
   contextStore.update((state) => ({ ...state, isLoading: true, error: null }));
   try {
     const environments = await api.getEnvironmentsList();
@@ -71,6 +87,15 @@ async function refreshEnvironmentContext(preferredEnvId = "") {
       error: null,
     }));
   } catch (error) {
+    if (error?.status === 401) {
+      contextStore.update((state) => ({
+        ...state,
+        isLoading: false,
+        isLoaded: false,
+        error: null,
+      }));
+      return;
+    }
     console.error(
       "[environmentContext][Coherence:Failed] Failed to refresh environments",
       error,