Add remember-me auth token cookie support.

Persistent 30-day HttpOnly login via auth_tokens table; Auth integrates tryRestore for session recovery.

src/Auth.php

@@ -246,6 +246,7 @@ final class Auth {
 
     public static function logout(): void {
         self::clearPending2fa();
+        AuthRemember::clear();
         unset($_SESSION['user']);
     }
 

src/AuthRemember.php

@@ -0,0 +1,127 @@
+<?php
+declare(strict_types=1);
+
+/** Persistent login via HttpOnly cookie backed by auth_tokens (purpose login_magic). */
+final class AuthRemember {
+    private const COOKIE = 'ac_remember';
+    private const TTL_SECONDS = 2592000; // 30 days
+
+    private function __construct() {
+    }
+
+    public static function tryRestore(): void {
+        if (PHP_SAPI === 'cli' || !empty($_SESSION['user'])) {
+            return;
+        }
+        $raw = trim((string) ($_COOKIE[self::COOKIE] ?? ''));
+        if ($raw === '' || !preg_match('/^[a-f0-9]{64}$/', $raw)) {
+            return;
+        }
+        AuthEmailSchema::ensure(Database::pdo());
+        $hash = hash('sha256', $raw);
+        $stmt = Database::pdo()->prepare(
+            "SELECT t.user_id, u.* FROM auth_tokens t
+             INNER JOIN users u ON u.id = t.user_id
+             WHERE t.token_hash = ? AND t.purpose = 'login_magic'
+               AND t.used_at IS NULL AND t.expires_at > ?
+             LIMIT 1"
+        );
+        $now = gmdate('Y-m-d H:i:s');
+        $stmt->execute([$hash, $now]);
+        $row = $stmt->fetch(PDO::FETCH_ASSOC);
+        if (!$row || empty($row['id'])) {
+            self::clearCookie();
+            return;
+        }
+        $status = (string) ($row['status'] ?? 'active');
+        if ($status !== 'active') {
+            self::clearCookie();
+            return;
+        }
+        if (AuthFactors::hasTotp((int) $row['id'])) {
+            // Remember-me skips password but not 2FA.
+            return;
+        }
+        Database::ensureRbacSchema();
+        Rbac::seedMembershipsForUser((int) $row['id'], (string) ($row['role'] ?? 'viewer'));
+        $_SESSION['user'] = Rbac::buildSessionUser($row);
+        Auth::touchSession();
+    }
+
+    public static function issue(int $userId): void {
+        if ($userId <= 0) {
+            return;
+        }
+        AuthEmailSchema::ensure(Database::pdo());
+        $pdo = Database::pdo();
+        $pdo->prepare(
+            "DELETE FROM auth_tokens WHERE user_id = ? AND purpose = 'login_magic' AND used_at IS NULL"
+        )->execute([$userId]);
+        $raw = bin2hex(random_bytes(32));
+        $hash = hash('sha256', $raw);
+        $expires = gmdate('Y-m-d H:i:s', time() + self::TTL_SECONDS);
+        $pdo->prepare(
+            'INSERT INTO auth_tokens (user_id, purpose, token_hash, expires_at, created_at)
+             VALUES (?, ?, ?, ?, ?)'
+        )->execute([$userId, 'login_magic', $hash, $expires, gmdate('Y-m-d H:i:s')]);
+        self::setCookie($raw, self::TTL_SECONDS);
+    }
+
+    public static function clear(): void {
+        $raw = trim((string) ($_COOKIE[self::COOKIE] ?? ''));
+        if ($raw !== '' && preg_match('/^[a-f0-9]{64}$/', $raw)) {
+            AuthEmailSchema::ensure(Database::pdo());
+            $hash = hash('sha256', $raw);
+            Database::pdo()->prepare(
+                "UPDATE auth_tokens SET used_at = ? WHERE token_hash = ? AND purpose = 'login_magic' AND used_at IS NULL"
+            )->execute([gmdate('Y-m-d H:i:s'), $hash]);
+        }
+        self::clearCookie();
+    }
+
+    public static function stashPendingFromRequest(): void {
+        if (!empty($_POST['remember_me'])) {
+            $_SESSION['remember_me_after_login'] = 1;
+        } else {
+            unset($_SESSION['remember_me_after_login']);
+        }
+    }
+
+    public static function applyPending(int $userId): void {
+        if ($userId <= 0 || empty($_SESSION['remember_me_after_login'])) {
+            unset($_SESSION['remember_me_after_login']);
+            return;
+        }
+        unset($_SESSION['remember_me_after_login']);
+        self::issue($userId);
+    }
+
+    private static function cookiePath(): string {
+        $path = trim((string) cfg('session_cookie_path', '/app/androidcast_project'));
+        return $path !== '' ? rtrim($path, '/') : '/';
+    }
+
+    private static function setCookie(string $value, int $maxAge): void {
+        $secure = function_exists('platform_is_https_request') && platform_is_https_request();
+        setcookie(self::COOKIE, $value, [
+            'expires' => time() + $maxAge,
+            'path' => self::cookiePath(),
+            'secure' => $secure,
+            'httponly' => true,
+            'samesite' => 'Lax',
+        ]);
+        $_COOKIE[self::COOKIE] = $value;
+    }
+
+    private static function clearCookie(): void {
+        $secure = function_exists('platform_is_https_request') && platform_is_https_request();
+        setcookie(self::COOKIE, '', [
+            'expires' => time() - 3600,
+            'path' => self::cookiePath(),
+            'secure' => $secure,
+            'httponly' => true,
+            'samesite' => 'Lax',
+        ]);
+        unset($_COOKIE[self::COOKIE]);
+    }
+}