feat(Select): 优化下拉框位置调整和交互逻辑

- 添加光标悬停样式，增强用户体验
- 实现下拉框位置动态调整，适应不同屏幕尺寸
- 增加鼠标移入移出事件处理，优化下拉框显示逻辑
- 修复下拉框颜色样式，提升视觉一致性

src/components/Select.tsx

@@ -10,6 +10,7 @@ import {
   JSX,
   Match,
   mergeProps,
+  onCleanup,
   onMount,
   Show,
   Switch,
@@ -40,7 +41,7 @@ const SimpleOptions: Component<SimpleOptionsProps> = (props) => {
         {(option) => (
           <div
             class={cx(
-              'rounded-sm px-2 py-1 transition-colors duration-100',
+              'rounded-sm px-2 py-1 transition-colors duration-100 cursor-pointer',
               option().value === props.active && 'bg-primary-surface text-on-primary-surface',
               option().value === props.active
                 ? 'hover:bg-primary-surface-hover hover:text-on-primary-surface'
@@ -79,7 +80,7 @@ const GroupedOptions: Component<GroupedOptionsProps> = (props) => {
                 {(option) => (
                   <div
                     class={cx(
-                      'rounded-sm px-2 py-1 transition-colors duration-100',
+                      'rounded-sm px-2 py-1 transition-colors duration-100 cursor-pointer',
                       option().value === props.active &&
                         'bg-primary-surface text-on-primary-surface',
                       option().value === props.active
@@ -123,6 +124,7 @@ const Select: Component<SelectProps> = (props) => {
 
   let trigger: HTMLDivElement;
   let optionFrame: HTMLDivElement;
+  let hideOptionTimer: number | undefined = undefined;
 
   const [selected, setSelected] = createSignal<Option['value'] | undefined>(undefined);
   const [optionVisible, setOptionVisible] = createSignal(false);
@@ -156,6 +158,70 @@ const Select: Component<SelectProps> = (props) => {
       return placeholderContent;
     }
   });
+  const adjustPosition = () => {
+    const triggerRect = trigger.getBoundingClientRect();
+    const optionsRect = optionFrame.getBoundingClientRect();
+    const distanceToBottom = window.innerHeight - triggerRect.bottom;
+
+    if (triggerRect.top < distanceToBottom) {
+      optionFrame.style.top = `${triggerRect.bottom + 4}px`;
+      optionFrame.style.height = `${Math.min(distanceToBottom * 0.6, window.innerHeight * 0.4)}px`;
+    } else {
+      optionFrame.style.top = `${triggerRect.top - optionsRect.height - 4}px`;
+      optionFrame.style.height = `${Math.min(distanceToBottom * 0.6, window.innerHeight * 0.4)}px`;
+    }
+    optionFrame.style.left = `${triggerRect.left}px`;
+    optionFrame.style.width = `clamp(${triggerRect.width}px, ${triggerRect.width * 1.5}px, ${
+      triggerRect.width * 2.5
+    }px)`;
+  };
+  const resizeObserver = new ResizeObserver(adjustPosition);
+
+  createEffect(() => {
+    if (optionVisible()) {
+      adjustPosition();
+      resizeObserver.observe(trigger);
+    }
+  });
+  onCleanup(() => {
+    resizeObserver.unobserve(trigger);
+    resizeObserver.disconnect();
+    clearTimeout(hideOptionTimer);
+  });
+
+  const handleMouseEnter = () => {
+    if (mProps.disabled) {
+      return;
+    }
+    clearTimeout(hideOptionTimer);
+  };
+  const handleMouseLeave = () => {
+    if (mProps.disabled) {
+      return;
+    }
+    clearTimeout(hideOptionTimer);
+    hideOptionTimer = setTimeout(() => {
+      setOptionVisible(false);
+    }, 500);
+  };
+  const handleActivation = () => {
+    if (mProps.disabled) {
+      return;
+    }
+    clearTimeout(hideOptionTimer);
+    setOptionVisible((prev) => !prev);
+  };
+  const handleOptionClick = (value: Option['value']) => {
+    if (selected() !== value) {
+      setSelected(value);
+      mProps.onChange?.(value);
+    } else {
+      setSelected(undefined);
+      mProps.onChange?.(undefined);
+    }
+    setOptionVisible(false);
+    clearTimeout(hideOptionTimer);
+  };
 
   return (
     <div class="relative inline-block">
@@ -170,7 +236,10 @@ const Select: Component<SelectProps> = (props) => {
             'border-b border-solid pb-[calc(var(--spacing)*1.5-1px)] border-on-surface text-on-surface aria-disabled:border-neutral-disabled aria-disabled:text-neutral-disabled hover:not-aria-disabled:text-primary-hover hover:not-aria-disabled:border-primary-hover',
           mProps.variant === 'immersive' &&
             'text-on-surface hover:not-aria-disabled:text-primary-hover aria-disabled:text-neutral-disabled',
-        )}>
+        )}
+        onMouseEnter={handleMouseEnter}
+        onMouseLeave={handleMouseLeave}
+        onClick={handleActivation}>
         <div class="flex-1 flex flex-row items-center truncate">
           <Dynamic component={displayLabel} />
         </div>
@@ -186,11 +255,24 @@ const Select: Component<SelectProps> = (props) => {
         <Portal>
           <div
             ref={optionFrame}
-            class="absolute z-[15] w-auto rounded-sm bg-surface-active px-1 py-1 elevation-1">
+            class="absolute z-[15] w-auto rounded-sm bg-neutral-variant-active px-1 py-1 elevation-1"
+            onMouseEnter={handleMouseEnter}
+            onMouseLeave={handleMouseLeave}>
             <ScrollArea enableY fullSize>
-              <Switch fallback={<GroupedOptions options={mProps.options} />}>
+              <Switch
+                fallback={
+                  <GroupedOptions
+                    options={mProps.options}
+                    active={selected()}
+                    onClick={handleOptionClick}
+                  />
+                }>
                 <Match when={Array.isArray(mProps.options)}>
-                  <SimpleOptions options={mProps.options} />
+                  <SimpleOptions
+                    options={mProps.options}
+                    active={selected()}
+                    onClick={handleOptionClick}
+                  />
                 </Match>
               </Switch>
             </ScrollArea>