Fix session revocation bug that could log out current device

- Fix: DELETE all other sessions query used empty string fallback when
  req.sessionId was undefined, causing id != '' to match ALL rows
  (including current session). Now skips deletion if sessionId unknown.
- Fix: Revoke All endpoint returns error if current session not identified
- Fix: var confirm shadowing window.confirm in password change handler

public/js/auth.js

@@ -594,13 +594,13 @@ document.addEventListener('DOMContentLoaded', function() {
       e.preventDefault();
       var current = document.getElementById('pw-current');
       var newPw = document.getElementById('pw-new');
-      var confirm = document.getElementById('pw-confirm');
+      var confirmPw = document.getElementById('pw-confirm');
       var status = document.getElementById('pw-change-status');
-      if (!current || !newPw || !confirm) return;
+      if (!current || !newPw || !confirmPw) return;
 
       if (!current.value || !newPw.value) { showToast('Fill in all fields', 'error'); return; }
       if (newPw.value.length < 8) { showToast('New password must be 8+ characters', 'error'); return; }
-      if (newPw.value !== confirm.value) { showToast('Passwords do not match', 'error'); return; }
+      if (newPw.value !== confirmPw.value) { showToast('Passwords do not match', 'error'); return; }
 
       if (status) { status.textContent = 'Changing...'; status.style.color = 'var(--g500)'; }
 
@@ -614,7 +614,7 @@ document.addEventListener('DOMContentLoaded', function() {
         if (data.success) {
           showToast(data.message || 'Password changed', 'success');
           if (data.passwordWarning) setTimeout(function() { showToast(data.passwordWarning, 'warning'); }, 1500);
-          current.value = ''; newPw.value = ''; confirm.value = '';
+          current.value = ''; newPw.value = ''; confirmPw.value = '';
           if (status) { status.textContent = ''; }
           if (typeof loadSessions === 'function') loadSessions();
         } else {

src/routes/auth.js

@@ -449,7 +449,9 @@ router.post('/change-password', authMiddleware, async (req, res) => {
     await db.run('UPDATE users SET password = ? WHERE id = ?', [hash, req.user.id]);
 
     // Destroy all OTHER sessions (keep current one)
-    try { await db.run('DELETE FROM user_sessions WHERE user_id = ? AND id != ?', [req.user.id, req.sessionId || '']); } catch (e) { /* best effort */ }
+    if (req.sessionId) {
+      try { await db.run('DELETE FROM user_sessions WHERE user_id = ? AND id != ?', [req.user.id, req.sessionId]); } catch (e) { /* best effort */ }
+    }
 
     await db.run('INSERT INTO audit_log (user_id, action, ip_address) VALUES (?, ?, ?)', [req.user.id, 'password_changed', req.ip]);
 

src/routes/sessions.js

@@ -38,9 +38,10 @@ router.delete('/:id', async function(req, res) {
 // Revoke all other sessions
 router.delete('/', async function(req, res) {
   try {
+    if (!req.sessionId) return res.status(400).json({ error: 'Current session not identified. Log out and log back in.' });
     var result = await db.run(
       'DELETE FROM user_sessions WHERE user_id = ? AND id != ?',
-      [req.user.id, req.sessionId || '']
+      [req.user.id, req.sessionId]
     );
     res.json({ success: true, revoked: result.changes });
   } catch (e) {