Support completing first-run setup after session restoration

src/App.svelte

@@ -51,6 +51,7 @@
   }
 
   async function loadAuthenticatedData() {
+    if (mustReplaceCredentials) return;
     await loadActivity();
     await loadNotifications();
     await loadDiagnostics();
@@ -1643,6 +1644,7 @@
           <div class="panel-header"><span>FIRST-RUN SETUP</span></div>
           <div class="auth-gate-body credential-form">
             <strong>Replace the generated administrator credentials</strong>
+            <label for="setup-current-password" class="micro">CURRENT PASSWORD</label><input id="setup-current-password" class="control" type="password" bind:value={password} autocomplete="current-password" />
             <label for="new-username" class="micro">NEW USERNAME</label><input id="new-username" class="control" bind:value={newUsername} autocomplete="username" />
             <label for="new-password" class="micro">NEW PASSWORD</label><input id="new-password" class="control" type="password" bind:value={newPassword} autocomplete="new-password" />
             <button class="primary" onclick={replaceCredentials} disabled={authBusy}>SAVE AND CONTINUE</button>