feedback4: a tap on the board stays on the tile under the finger — the field canvas is a click target of its own (a no-op click listener, render/app.js onTapTarget), so the browser's touch adjustment no longer moves a tap on the back row onto a bond disc: PR #149's 收起 toggle pushed the discs one button (≈ 55 px) to the right, and at 844×390 a tap on the row-12 unit opened the bond popup instead of selecting it (test/render/models.browser.test.js #4.1 touch, 0.1.4 release candidate; passes with #149's client diff reverted, fails with it); DESIGN §18.1 Touch; test/ui/playtest2.test.js; golden unchanged (client only)

public/js/render/app.js

@@ -1404,6 +1404,12 @@ export async function createFieldView(host, options = {}) {
   // selects it and its underframe opens over the tile (clamped under the top bar on a phone), and the click pressed
   // 撤退 / 出售 (user playtest #4 item 1 on a phone). Cancelling touchend drops them.
   const onTouchEnd = (e) => { if (e.cancelable) e.preventDefault(); };
+  // The canvas is a click target too (a no-op listener). The browser's touch adjustment moves a tap onto a nearby
+  // element that responds to clicks (click / mousedown listeners, buttons, links; pointer listeners do not count) when the
+  // finger's contact area reaches one, so a tap on the back row right under the bond strip's discs (row 12 at 844×390 once
+  // the 收起 toggle of PR #149 moved the discs one button to the right) opened the bond popup instead of selecting the
+  // unit. As a click target that holds the finger's point the canvas wins: a tap on the board stays on the tile under it.
+  const onTapTarget = () => {};
   canvas.addEventListener('pointerdown', onPointerDown);
   canvas.addEventListener('pointermove', onPointerMove);
   canvas.addEventListener('pointerup', onPointerUp);
@@ -1411,6 +1417,7 @@ export async function createFieldView(host, options = {}) {
   canvas.addEventListener('pointerleave', onPointerLeave);
   canvas.addEventListener('contextmenu', onContext);
   canvas.addEventListener('touchend', onTouchEnd, { passive: false });
+  canvas.addEventListener('click', onTapTarget);
 
   // ---- battle ---------------------------------------------------------------------------------------------
 
@@ -2006,6 +2013,7 @@ export async function createFieldView(host, options = {}) {
       canvas.removeEventListener('pointerleave', onPointerLeave);
       canvas.removeEventListener('contextmenu', onContext);
       canvas.removeEventListener('touchend', onTouchEnd);
+      canvas.removeEventListener('click', onTapTarget);
       app.ticker.remove(frame);
       app.ticker.remove(preRender);
       app.ticker.remove(postRender);