Harden WebCRT interactive sessions for more CRT-like device login.

Improve async connect, binary stdout coalescing, paste throttling with progress, SSH keepalive, login prompt settle, and optional SFTP while keeping core terminal UX focused.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/i18n/en.ts

@@ -939,6 +939,25 @@ const en = {
       copied: "Copied to clipboard",
       copyEmpty: "Terminal is empty",
       copyFailed: "Copy failed",
+      break: "Break",
+      breakSent: "Break sent",
+      broadcast: "Broadcast",
+      broadcastSent: "Sent to all sessions",
+      postLogin: "Post-login cmds",
+    },
+    favorites: "Favorites",
+    recent: "Recent",
+    favorite: "Toggle favorite",
+    encoding: "Encoding",
+    fontSize: "Font",
+    broadcastPh: "Send to all tabs…",
+    buttonBarHint: "One per line: label|command",
+    postLoginPrompt: "Post-login commands (one per line, this device)",
+    postLoginSaved: "Post-login commands saved",
+    sftp: {
+      refresh: "Refresh",
+      upload: "Upload",
+      uploaded: "Upload complete",
     },
     err: {
       sessionLimit: "Session limit reached; close other terminals first",
@@ -946,6 +965,8 @@ const en = {
       credsIncomplete: "Incomplete username/password on this NE",
       cliProfile: "UME NEs require a CLI connect profile (default account / hop)",
       connectFailed: "Device login failed: {{detail}}",
+      sftpHop: "SFTP does not support hop devices yet (direct SSH only)",
+      sftpSsh: "SFTP requires SSH",
     },
   },
   topology: {