Revert "Playground: capture Ctrl+W as delete-previous-word"

This reverts commit b82f7b65fb.

static/js/wasm-terminal.js

@@ -809,17 +809,6 @@ async function handleInput(data) {
       continue;
     }
 
-    if (code === 23) { // Ctrl+W — delete previous word
-      const before = inputBuffer.slice(0, cursorPos);
-      const after = inputBuffer.slice(cursorPos);
-      // Skip trailing spaces, then delete back to the previous space
-      const trimmed = before.replace(/\S+\s*$/, "");
-      cursorPos = trimmed.length;
-      inputBuffer = trimmed + after;
-      redrawInput();
-      continue;
-    }
-
     if (code === 21) { // Ctrl+U
       inputBuffer = "";
       cursorPos = 0;
@@ -877,14 +866,6 @@ async function initPlayground(containerId) {
   terminal.open(container);
   fitAddon.fit();
 
-  // Prevent browser from closing the tab on Ctrl+W when the terminal is focused;
-  // xterm.js will receive it as code 23 and we handle it as "delete previous word".
-  container.addEventListener("keydown", (ev) => {
-    if (ev.ctrlKey && ev.key === "w") {
-      ev.preventDefault();
-    }
-  }, true);
-
   window.addEventListener("resize", () => fitAddon.fit());
 
   terminal.writeln("\x1b[1;38;5;166m  _   _ _   _ _   _ _\x1b[0m");