feat: rework Electron desktop app to run standalone-first with optional two-way sync to a remote Termix server

src/ui/locales/en.json

@@ -389,6 +389,37 @@
     "noSavedServers": "No saved servers",
     "removeServer": "Remove"
   },
+  "remoteSync": {
+    "title": "Remote Sync",
+    "description": "Optionally connect this desktop app to a self-hosted Termix server to sync your hosts, credentials, and snippets across devices. The app always works fully offline whether or not you connect.",
+    "notConnected": "Not connected",
+    "connected": "Connected",
+    "connectedTo": "Connected to {{url}}",
+    "lastSynced": "Last synced {{time}}",
+    "neverSynced": "Never synced",
+    "syncError": "Sync error: {{message}}",
+    "needsReauth": "Sign-in expired",
+    "connectButton": "Connect to Server",
+    "disconnectButton": "Disconnect",
+    "syncNowButton": "Sync Now",
+    "syncing": "Syncing...",
+    "serverUrl": "Server URL",
+    "enterServerUrl": "Please enter a server URL",
+    "mustIncludeProtocol": "Server URL must start with http:// or https://",
+    "allowInvalidCertificate": "Allow invalid certificate",
+    "allowInvalidCertificateDesc": "Use only for trusted self-hosted servers with self-signed or IP-address certificates.",
+    "savedServers": "Saved Servers",
+    "removeServer": "Remove",
+    "continueButton": "Continue",
+    "cancelButton": "Cancel",
+    "signInTitle": "Sign in to {{url}}",
+    "originTitle": "Connection Origin",
+    "originDescription": "Choose where SSH connections originate from by default. This can be overridden per host.",
+    "originLocal": "This device (local network)",
+    "originRemote": "Remote server",
+    "bannerReconnect": "Reconnect",
+    "bannerMessage": "Remote sync needs re-authentication"
+  },
   "versionCheck": {
     "error": "Version Check Error",
     "checkFailed": "Failed to check for updates",
@@ -651,6 +682,11 @@
     "delayAfterMs": "Delay After (ms)",
     "useSocks5Proxy": "Use SOCKS5 Proxy",
     "useSocks5ProxyDesc": "Route connection through a proxy server",
+    "connectionOrigin": "Connection Origin",
+    "connectionOriginDesc": "Where this host's SSH connection originates from. Overrides the desktop app's global default.",
+    "connectionOriginDefault": "Use default",
+    "connectionOriginLocal": "This device (local network)",
+    "connectionOriginRemote": "Remote server",
     "proxyHost": "Proxy Host",
     "proxyPort": "Proxy Port",
     "proxyUsername": "Proxy Username",
@@ -2360,7 +2396,8 @@
     "resetCodeRateLimited": "Rate limited: Too many verification attempts. Please try again later.",
     "resetCodeRateLimitedWithTime": "Rate limited: Too many verification attempts. Please wait {{time}} seconds before trying again.",
     "authTokenSaveFailed": "Failed to save authentication token",
-    "failedToLoadServer": "Failed to load server"
+    "failedToLoadServer": "Failed to load server",
+    "remoteServerRequired": "Remote server required. Connect a remote server in Settings to use this connection type."
   },
   "messages": {
     "registrationDisabled": "New account registration is currently disabled by an admin. Please log in or contact an administrator.",