fix: 网页播种/重置在嵌入预览里没反应——弃用 window.prompt/confirm

播种按钮原来弹 window.prompt 选作物，重置弹 confirm——这俩在
sandbox iframe（内置预览面板）里会被静默屏蔽：不弹窗、直接返回
null，表现为"点了没反应"。普通浏览器没事，所以一直没暴露。

改成页面内交互：播种弹 #pickmask 弹层，列出未锁定作物的按钮 +
取消，点遮罩关闭；重置改两步确认，第一次点变"再点一次确认"，
3 秒不点自动还原。

farm/server/webui.py

@@ -82,6 +82,15 @@ DASHBOARD_HTML = r"""<!DOCTYPE html>
   .k-good { color: var(--green); } .k-bad { color: var(--red); }
   .k-warn { color: var(--gold); } .k-action { color: var(--cyan); }
   .notice { font-size: 12px; color: var(--dim); min-height: 18px; }
+  /* 播种选作物 / 二次确认的页面内弹层（不依赖 window.prompt，嵌入预览里也能用） */
+  .mask { position: fixed; inset: 0; background: rgba(30,40,30,.35);
+          display: none; align-items: center; justify-content: center; z-index: 30; }
+  .mask.show { display: flex; }
+  .pick { background: var(--card); border: 1px solid var(--line); border-radius: 12px;
+          padding: 14px 16px; min-width: 230px; box-shadow: 0 10px 30px rgba(0,0,0,.18); }
+  .pick h3 { margin: 0 0 10px; font-size: 14px; }
+  .pick .row { display: flex; flex-wrap: wrap; gap: 8px; }
+  .pick button.danger { border-color: var(--red); color: var(--red); }
   .toast {
     position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%);
     background: #23301f; color: #fff; padding: 9px 18px; border-radius: 20px;
@@ -167,6 +176,13 @@ DASHBOARD_HTML = r"""<!DOCTYPE html>
 
 <div class="toast" id="toast"></div>
 
+<div class="mask" id="pickmask">
+  <div class="pick">
+    <h3 id="picktitle">要种什么？</h3>
+    <div class="row" id="pickcrops"></div>
+  </div>
+</div>
+
 <script>
 const $ = (id) => document.getElementById(id);
 let es = null, state = null, catalog = null, pollTimer = null;
@@ -421,17 +437,12 @@ document.addEventListener("click", (ev) => {
   if (t.tagName !== "BUTTON") return;
   if (t.dataset.w) act("water", { plot: +t.dataset.w });
   else if (t.dataset.h) act("harvest", { plot: +t.dataset.h });
+  else if (t.dataset.plant !== undefined) {
+    $("pickmask").classList.remove("show");
+    if (t.dataset.plant && pickPlot) act("plant", { plot: pickPlot, crop: t.dataset.plant });
+  }
   else if (t.dataset.p) {
-    const plot = +t.dataset.p;
+    openCropPick(+t.dataset.p);
-    const pool = state ? Object.keys(cropNames).filter((k) => {
-      const c = (catalog || { crops: [] }).crops.find((x) => x.key === k);
-      return !c || !c.locked;
-    }) : [];
-    const pick = window.prompt("要种什么？输入编号：\n" +
-      pool.map((k, i) => (i + 1) + ". " + cropNames[k]).join("\n"), "1");
-    const idx = parseInt(pick, 10);
-    if (!idx || idx < 1 || idx > pool.length) return;
-    act("plant", { plot: plot, crop: pool[idx - 1] });
   }
   else if (t.dataset.f) act("feed", { animal_id: +t.dataset.f });
   else if (t.dataset.c) act("collect", { animal_id: +t.dataset.c });
@@ -439,10 +450,39 @@ document.addEventListener("click", (ev) => {
   else if (t.dataset.b) act("build", { key: t.dataset.b });
   else if (t.dataset.act === "buy_animal") act("buy_animal", { kind: $("buyanimal").value });
   else if (t.dataset.act === "buy_feed") act("buy_feed", { quantity: 10 });
-  else if (t.dataset.act === "reset") { if (confirm("确定重置牧场？所有进度都会清空")) act("reset"); }
+  else if (t.dataset.act === "reset") {
+    if (t.dataset.armed) {
+      t.dataset.armed = ""; t.textContent = "重置";
+      act("reset");
+    } else {
+      t.dataset.armed = "1"; t.textContent = "再点一次确认";
+      setTimeout(() => { t.dataset.armed = ""; t.textContent = "重置"; }, 3000);
+    }
+  }
   else if (t.dataset.act) act(t.dataset.act);
 });
 
+/* 播种选作物：页面内弹层。window.prompt 在 sandbox iframe（内置预览面板）里
+   会被静默屏蔽——不弹窗、直接返回 null，表现为"点播种没反应"。 */
+let pickPlot = 0;
+function openCropPick(plot) {
+  if (!state) { toast("还没连接上服务器"); return; }
+  const pool = Object.keys(cropNames).filter((k) => {
+    const c = (catalog || { crops: [] }).crops.find((x) => x.key === k);
+    return !c || !c.locked;
+  });
+  if (!pool.length) { toast("还没有可种的作物"); return; }
+  pickPlot = plot;
+  $("picktitle").textContent = plot + " 号地 · 要种什么？";
+  $("pickcrops").innerHTML = pool.map((k) =>
+    '<button data-plant="' + k + '">' + cropNames[k] + "</button>").join("") +
+    '<button class="danger" data-plant="">取消</button>';
+  $("pickmask").classList.add("show");
+}
+$("pickmask").addEventListener("click", (ev) => {
+  if (ev.target.id === "pickmask") $("pickmask").classList.remove("show");
+});
+
 $("join").addEventListener("click", () => {
   localStorage.setItem("sf.farm", farmName());
   localStorage.setItem("sf.token", token());