feat: implement 13 features — auto-reconnect, notifications, bulk actions, latency, traffic, theme, export/import, scheduled backups, peer lookup, SSH auto-reconnect, log filters, keyboard shortcut, and readyTimeout default

- Change readyTimeoutMs default from 0 to 30000 in both state files
- Register Alt+Shift+H keyboard shortcut via manifest _execute_action command
- Add severity filter buttons (All/Info/Warn/Error) and Download .txt to Logs page; background logs.js now tags entries with proper level field
- Fire browser notifications on tunnelError events (notifyOnTunnelError setting)
- Add exponential-backoff auto-reconnect for virtual hosts and service tunnels (tunnelAutoReconnect setting, 5s–120s backoff)
- Add backupIntervalHours setting and scheduled auto-backup timer in message-router.js
- Add TCP connect latency badges to Virtual Hosts and Service Tunnels tables via new pingTunnel native message
- Add bytesIn/bytesOut/requests counters to https-proxy.js; expose in Overview status bar via getState
- Add Export/Import connection configs (JSON, no CA key) in Settings
- Add autoReconnect flag and exponential-backoff reconnect to SSH connection cards
- Add light theme CSS variables and theme toggle in Settings (persisted to localStorage)
- Add checkbox column and bulk Stop/Remove actions to Virtual Hosts, Service Tunnels, and Servers tables
- Add Peer Lookup UI card on Overview page using existing lookup message handler

native-host/holesail-manager/settings.js

@@ -36,9 +36,12 @@ function updateSettings(patch) {
   }
   if (typeof patch.readyTimeoutMs === 'number') currentSettings.readyTimeoutMs = patch.readyTimeoutMs;
   if (typeof patch.notifyOnDisconnect === 'boolean') currentSettings.notifyOnDisconnect = patch.notifyOnDisconnect;
+  if (typeof patch.notifyOnTunnelError === 'boolean') currentSettings.notifyOnTunnelError = patch.notifyOnTunnelError;
   if (typeof patch.debug === 'boolean') currentSettings.debug = patch.debug;
   if (typeof patch.disableOnFileUrls === 'boolean') currentSettings.disableOnFileUrls = patch.disableOnFileUrls;
   if (typeof patch.backupRetention === 'number') currentSettings.backupRetention = patch.backupRetention;
+  if (typeof patch.backupIntervalHours === 'number') currentSettings.backupIntervalHours = patch.backupIntervalHours;
+  if (typeof patch.tunnelAutoReconnect === 'boolean') currentSettings.tunnelAutoReconnect = patch.tunnelAutoReconnect;
   if (_saveState) _saveState();
   return { requiresRestart };
 }
@@ -49,5 +52,6 @@ function setProxyPort(port) {
 }
 
 function getReadyTimeoutMs() { return currentSettings.readyTimeoutMs; }
+function getTunnelAutoReconnect() { return !!currentSettings.tunnelAutoReconnect; }
 
-module.exports = { init, applyLoaded, getSettings, updateSettings, getProxyPort, setProxyPort, getReadyTimeoutMs };
+module.exports = { init, applyLoaded, getSettings, updateSettings, getProxyPort, setProxyPort, getReadyTimeoutMs, getTunnelAutoReconnect };