security: harden builtin admin pwd logging and fix auth token persistence

- Truncate admin password in logs; write full password to data/auth.log (0o600)
- Persist access token in sessionStorage so it survives page reloads
- Simplify tryRefreshToken to use GSAP-style promise deduplication
- Remove spurious POST redirect on 401 during token refresh
- Guard passkey button reference in login finally block

webui/static/hoover/api.js

@@ -13,7 +13,8 @@ import { isModalProcessing, setModalProcessing, refreshModals } from './componen
 /**
  * Global state — shared with auth.js component.
  *
- * ``window.__auth_token__`` — current access token (in memory, cleared on reload).
+ * ``window.__auth_token__`` — current access token (in memory).
+ * ``sessionStorage['vw:access']`` — persisted access token (tab-scoped).
  * ``sessionStorage['vw:refresh']`` — refresh token (tab-scoped, cleared on close).
  * ``sessionStorage['vw:access_ttl']`` — access token TTL in ms for refresh scheduling.
  * ``sessionStorage['vw:session_id']`` — session binding ID for token validation.
@@ -26,7 +27,7 @@ import { isModalProcessing, setModalProcessing, refreshModals } from './componen
  * @returns {string|undefined}
  */
 function getAuthToken() {
-    return window.__auth_token__;
+    return window.__auth_token__ || sessionStorage.getItem('vw:access');
 }
 
 /**
@@ -36,6 +37,7 @@ function getAuthToken() {
  */
 function setAuthToken(token) {
     window.__auth_token__ = token;
+    sessionStorage.setItem('vw:access', token);
 }
 
 /**
@@ -48,6 +50,7 @@ function clearAuthTokens() {
     sessionStorage.removeItem('vw:session_id');
     sessionStorage.removeItem('vw:user');
     sessionStorage.removeItem('vw:permissions');
+    sessionStorage.removeItem('vw:access');
     if (typeof window.__authRefreshTimer__ !== 'undefined') {
         clearTimeout(window.__authRefreshTimer__);
         window.__authRefreshTimer__ = undefined;
@@ -81,9 +84,7 @@ let _refreshPromise = null;
  * @returns {Promise<boolean>} ``true`` if refresh succeeded
  */
 async function tryRefreshToken() {
-    if (_refreshPromise) return _refreshPromise;
-
-    _refreshPromise = (async () => {
+    _refreshPromise = _refreshPromise || (async () => {
         try {
             const stored = getStoredAuth();
             if (!stored.refresh) return false;
@@ -104,7 +105,7 @@ async function tryRefreshToken() {
                 return false;
             }
             const tokens = json.data.tokens;
-            window.__auth_token__ = tokens.access_token;
+            setAuthToken(tokens.access_token);
             sessionStorage.setItem('vw:refresh', tokens.refresh_token);
             sessionStorage.setItem('vw:access_ttl', String((json.data.access_ttl || 300) * 1000));
             sessionStorage.setItem('vw:session_id', tokens.session_id);
@@ -117,8 +118,7 @@ async function tryRefreshToken() {
             return false;
         }
     })();
-    _refreshPromise = _refreshPromise.finally(() => { _refreshPromise = null; });
-    return _refreshPromise;
+    return _refreshPromise.finally(() => { _refreshPromise = null; });
 }
 
 /**
@@ -165,10 +165,6 @@ export async function apiFetch(url, options = {}) {
         if (res.status === 401 && getAuthToken()) {
             const refreshed = await tryRefreshToken();
             if (refreshed) {
-                if (method === 'POST') {
-                    redirectLogin();
-                    return { ok: false, data: null, error: 'Session expired', status: 401 };
-                }
                 const refreshedStored = getStoredAuth();
                 headers['Authorization'] = 'Bearer ' + getAuthToken();
                 headers['X-Session-Id'] = refreshedStored.session_id;