元素拾取悬停0.3秒自动钻入子元素, 无需先锁定再调层级

- 进入新交互区域先吸附交互元素, 悬停300ms后自动钻入光标最深处
- 钻入后跟随光标在卡片内部移动; PageUp/PageDown 保留为手动上下调层(未锁定时直接锁定)

src/main/browser/session.ts

@@ -1256,6 +1256,9 @@ const PICKER_BOOTSTRAP_SOURCE = `(() => {
   let badge = null;
   let target = null;
   let deepTarget = null;
+  let lastSnap = null;
+  let drilled = false;
+  let hoverTimer = 0;
   let locked = false;
   let chain = [];
   let chainIndex = 0;
@@ -1341,7 +1344,7 @@ const PICKER_BOOTSTRAP_SOURCE = `(() => {
     if (locked) {
       badge.textContent = '已锁定 ' + (chainIndex + 1) + '/' + chain.length + ' · ' + tag + (name ? ' · ' + name.slice(0, 42) : '') + ' · [PageUp]升 [PageDown]钻入子元素 [空格]确认 [Esc]取消';
     } else {
-      badge.textContent = '拾取 · ' + tag + (name ? ' · ' + name.slice(0, 42) : '') + ' · [空格]锁定 [Esc]取消 · 可直接翻页后继续拾取';
+      badge.textContent = '拾取 · ' + tag + (name ? ' · ' + name.slice(0, 42) : '') + ' · 悬停0.3秒自动钻入 · [PageUp/PageDown]手动调层 [空格]确认 [Esc]取消 · 可直接翻页后继续拾取';
     }
     badge.style.left = Math.max(0, rect.left) + 'px';
     badge.style.top = Math.max(0, rect.top - 34) + 'px';
@@ -1387,25 +1390,26 @@ const PICKER_BOOTSTRAP_SOURCE = `(() => {
     }
     return result;
   };
-  const lock = () => {
-    if (locked || !target) return;
+  const lockAt = (base) => {
+    if (locked || !base) return;
     locked = true;
-    chain = buildChain(target);
+    chain = buildChain(base);
     chainIndex = Math.max(0, chain.length - 1);
-    // 把光标下最深处元素到锁定元素之间的子级路径并入链，PageDown 可钻入卡片内部的标题/价格等子元素
-    if (deepTarget && target !== deepTarget && target.contains(deepTarget)) {
+    // 把光标下最深处元素到锁定元素之间的子级路径并入链，PageDown/PageUp 可在卡片与其内部子元素间切换
+    if (deepTarget && base !== deepTarget && base.contains(deepTarget)) {
       const below = [];
       let current = deepTarget;
-      while (current && current !== target && target.contains(current)) {
+      while (current && current !== base && base.contains(current)) {
         below.unshift(current);
         const root = current.getRootNode();
         current = root instanceof ShadowRoot ? root.host : current.parentElement;
       }
       chain = chain.concat(below);
     }
-    selected = chain[chainIndex] || target;
+    selected = chain[chainIndex] || base;
     updateBox();
   };
+  const lock = () => lockAt(target);
   const adjustLevel = (delta) => {
     if (!locked || !chain.length) return;
     const next = Math.min(chain.length - 1, Math.max(0, chainIndex + delta));
@@ -1421,7 +1425,27 @@ const PICKER_BOOTSTRAP_SOURCE = `(() => {
   const move = (event) => {
     if (finished || locked) return;
     deepTarget = deepestOf(event);
-    target = firstElement(event);
+    const snapped = firstElement(event);
+    if (snapped !== lastSnap) {
+      // 进入新的交互区域：先吸附交互元素，悬停 0.3 秒后自动钻入光标最深处
+      lastSnap = snapped;
+      drilled = false;
+      target = snapped;
+      clearTimeout(hoverTimer);
+      if (deepTarget && deepTarget !== snapped) {
+        hoverTimer = setTimeout(() => {
+          if (finished || locked) return;
+          drilled = true;
+          target = deepTarget;
+          updateBox();
+        }, 300);
+      }
+      updateBox();
+      return;
+    }
+    if (drilled && deepTarget && snapped.contains(deepTarget)) {
+      target = deepTarget; // 已钻入：跟随光标在卡片内部移动
+    }
     updateBox();
   };
   const click = (event) => {
@@ -1444,21 +1468,24 @@ const PICKER_BOOTSTRAP_SOURCE = `(() => {
       else lock();
       return;
     }
-    if (locked && event.key === 'PageUp' && !event.repeat) {
+    if (event.key === 'PageDown' && !event.repeat) {
       event.preventDefault();
       event.stopPropagation();
-      adjustLevel(-1);
+      if (locked) adjustLevel(1);
+      else lockAt(deepTarget || target); // 未锁定时直接锁定光标最深处（如卡片内的标题）
       return;
     }
-    if (locked && event.key === 'PageDown' && !event.repeat) {
+    if (event.key === 'PageUp' && !event.repeat) {
       event.preventDefault();
       event.stopPropagation();
-      adjustLevel(1);
+      if (locked) adjustLevel(-1);
+      else if (target) lockAt(target); // 未锁定时锁定吸附到的交互元素（如整张卡片）
     }
   };
   const cleanup = () => {
     if (finished) return;
     finished = true;
+    clearTimeout(hoverTimer);
     window.removeEventListener('mousemove', move, true);
     window.removeEventListener('mousedown', click, true);
     window.removeEventListener('click', click, true);