feat: optimize TopBar search with Cmd+K shortcut and improved styling

- Add global Cmd/Ctrl+K keyboard shortcut to focus search input
- Show keyboard shortcut hint (⌘K) in search input when empty
- Improve input styling: rounded-lg, softer borders, focus transitions
- Improve dropdown: rounded-lg, larger shadow, better spacing
- Larger result icons (h-8 w-8) with rounded-lg containers
- Refined history section with uppercase label and muted icon
- Search icon fades in on focus via group-focus-within

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/components/TopBar.tsx

@@ -49,6 +49,19 @@ export default function TopBar({ onOpenOptions }: { onOpenOptions: () => void })
     return () => document.removeEventListener('mousedown', handleClickOutside);
   }, []);
 
+  // Cmd/Ctrl+K 快捷键聚焦搜索框
+  useEffect(() => {
+    const handleGlobalKeyDown = (e: KeyboardEvent) => {
+      if ((e.metaKey || e.ctrlKey) && e.key === 'k') {
+        e.preventDefault();
+        inputRef.current?.focus();
+        setShowResults(true);
+      }
+    };
+    document.addEventListener('keydown', handleGlobalKeyDown);
+    return () => document.removeEventListener('keydown', handleGlobalKeyDown);
+  }, []);
+
   useEffect(() => {
     storageUtil
       .get('app/searchHistory', [])
@@ -153,8 +166,8 @@ export default function TopBar({ onOpenOptions }: { onOpenOptions: () => void })
 
       {/* 中间：搜索容器 */}
       <div ref={containerRef} className="flex-1 mx-4 max-w-md relative">
-        <div className="relative">
+        <div className="relative group">
-          <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground pointer-events-none" />
+          <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground/60 group-focus-within:text-muted-foreground transition-colors pointer-events-none" />
           <input
             ref={inputRef}
             type="text"
@@ -168,8 +181,13 @@ export default function TopBar({ onOpenOptions }: { onOpenOptions: () => void })
             onFocus={() => setShowResults(true)}
             onKeyDown={handleKeyDown}
             aria-label={t('common_buttons_search')}
-            className="w-full h-9 pl-9 pr-8 text-sm rounded-md border border-input bg-muted/50 transition-all placeholder:text-muted-foreground focus:bg-background focus:outline-none focus:ring-1 focus:ring-ring focus:border-input"
+            className="w-full h-9 pl-9 pr-16 text-sm rounded-lg border border-border/60 bg-muted/40 transition-all placeholder:text-muted-foreground/50 focus:bg-background focus:outline-none focus:ring-1 focus:ring-ring focus:border-input"
           />
+          {!searchQuery && (
+            <kbd className="absolute right-3 top-1/2 -translate-y-1/2 hidden sm:inline-flex h-5 items-center gap-0.5 rounded border border-border/60 bg-muted px-1.5 font-mono text-[10px] font-medium text-muted-foreground/60 pointer-events-none">
+              ⌘K
+            </kbd>
+          )}
           {searchQuery && (
             <button
               type="button"
@@ -187,8 +205,8 @@ export default function TopBar({ onOpenOptions }: { onOpenOptions: () => void })
 
         {/* 动态联想结果卡片 */}
         {showResults && (searchQuery.trim() || displayedHistory.length > 0) && (
-          <div className="absolute top-full left-0 right-0 mt-1 bg-popover text-popover-foreground rounded-md shadow-md border border-border max-h-80 overflow-y-auto z-50 animate-in fade-in slide-in-from-top-1 duration-150">
+          <div className="absolute top-full left-0 right-0 mt-1.5 bg-popover text-popover-foreground rounded-lg shadow-lg border border-border max-h-80 overflow-y-auto z-50 animate-in fade-in slide-in-from-top-2 duration-150">
-            <ul role="listbox" className="p-1">
+            <ul role="listbox" className="p-1.5">
               {searchQuery.trim() ? (
                 searchResults.length > 0 ? (
                   searchResults.map((feature, index) => (
@@ -198,20 +216,25 @@ export default function TopBar({ onOpenOptions }: { onOpenOptions: () => void })
                       aria-selected={selectedIndex === index}
                       onClick={() => handleSelectFeature(feature)}
                       className={cn(
-                        'flex items-center gap-3 px-2.5 py-2 rounded-sm cursor-pointer text-sm transition-colors',
+                        'flex items-center gap-3 px-3 py-2.5 rounded-md cursor-pointer text-sm transition-colors',
                         selectedIndex === index
                           ? 'bg-accent text-accent-foreground'
                           : 'hover:bg-muted/60',
                       )}
                     >
-                      <div className="flex h-7 w-7 shrink-0 items-center justify-center rounded-sm bg-muted text-muted-foreground">
+                      <div
+                        className={cn(
+                          'flex h-8 w-8 shrink-0 items-center justify-center rounded-lg',
+                          'bg-muted/80 text-muted-foreground',
+                        )}
+                      >
                         {feature.icon && <feature.icon className="h-4 w-4" />}
                       </div>
                       <div className="flex-1 min-w-0">
                         <p className="font-medium text-foreground truncate">
                           {t(feature.labelKey)}
                         </p>
-                        <p className="text-xs text-muted-foreground truncate">
+                        <p className="text-xs text-muted-foreground truncate mt-0.5">
                           {t(feature.descriptionKey)}
                         </p>
                       </div>
@@ -224,7 +247,7 @@ export default function TopBar({ onOpenOptions }: { onOpenOptions: () => void })
                 )
               ) : (
                 <>
-                  <div className="px-2.5 py-1.5 text-xs font-semibold tracking-wider text-muted-foreground/80">
+                  <div className="px-3 py-1.5 text-[11px] font-semibold tracking-wider text-muted-foreground/60 uppercase">
                     {t('common:buttons.recentSearch')}
                   </div>
                   {displayedHistory.map((item, index) => (
@@ -237,13 +260,13 @@ export default function TopBar({ onOpenOptions }: { onOpenOptions: () => void })
                         setSelectedIndex(-1);
                       }}
                       className={cn(
-                        'flex items-center gap-3 px-2.5 py-2 rounded-sm cursor-pointer text-sm transition-colors',
+                        'flex items-center gap-3 px-3 py-2 rounded-md cursor-pointer text-sm transition-colors',
                         selectedIndex === index
                           ? 'bg-accent text-accent-foreground'
                           : 'hover:bg-muted/60',
                       )}
                     >
-                      <History className="h-4 w-4 text-muted-foreground shrink-0" />
+                      <History className="h-4 w-4 text-muted-foreground/60 shrink-0" />
                       <span className="truncate">{item}</span>
                     </li>
                   ))}