fix(maestro): bind terminal touch scroll to .xterm

The touch handlers sat on `.xterm-viewport`, but xterm appends the
absolutely-positioned viewport before the `position: relative` screen, so
`.xterm-screen` paints over it and takes every touch. The viewport is not an
ancestor of the screen, so the listeners never fired and mobile drags did
nothing. Moves them, and `touch-action: none`, to `.xterm`.

web/src/attach.ts

@@ -143,8 +143,10 @@ export function createAttachConnection(
   //   • alt screen with no mouse tracking → nothing to do; the app owns input.
   // `touch-action: none` (CSS) keeps the browser from cancelling the custom
   // gesture stream; only the terminal surface opts out of native page panning.
+  // Listeners MUST sit on `.xterm`, not `.xterm-viewport`: `.xterm-screen` is a
+  // later sibling of the viewport, so it paints over it and takes every touch.
   {
-    const vp = el.querySelector(".xterm-viewport") as HTMLElement | null;
+    const root = term.element as HTMLElement | undefined;
     const screen = el.querySelector(".xterm-screen") as HTMLElement | null;
     const cellH = () => {
       const core = (term as unknown as {
@@ -152,11 +154,11 @@ export function createAttachConnection(
       })._core;
       return core?._renderService?.dimensions?.css?.cell?.height || 16;
     };
-    if (vp) {
+    if (root) {
       let lastY = 0;
       let lastX = 0;
       let remainder = 0;
-      vp.addEventListener(
+      root.addEventListener(
         "touchstart",
         (e) => {
           if (e.touches.length !== 1) return;
@@ -166,7 +168,7 @@ export function createAttachConnection(
         },
         { passive: true },
       );
-      vp.addEventListener(
+      root.addEventListener(
         "touchmove",
         (e) => {
           if (e.touches.length !== 1) return;

web/src/styles.css

@@ -1332,10 +1332,12 @@ input.leaf-rename:focus {
 .attach-body .xterm .xterm-viewport {
   overflow-y: auto;
   scrollbar-width: none;
-  /* Maestro drives scrollback from touchmove (see attach.ts). `pan-y` hands
+}
-     the gesture to the browser, which may cancel the event stream before the
+
-     terminal sees it; `none` keeps a drag inside the terminal under our
+/* Maestro drives scrollback from touchmove (see attach.ts), so the browser must
-     control while the rest of the page retains native scrolling. */
+   not claim the gesture. On `.xterm`, not the viewport: `.xterm-screen` paints
+   over the viewport and is what a finger lands on. */
+.attach-body .xterm {
   touch-action: none;
 }