feat: introduce SectionHeader component (#185)

* feat: introduce SectionHeader component

* fix: use ReactNode for label

* fix: adjust gap spacing in SectionHeader component

* fix: update text color classes in SectionHeader

* fix: label prop

src/SettingsApp.tsx

@@ -326,7 +326,7 @@ function SettingsApp() {
           {(isSaving || saveMessage) && (
             <div
               className={clsx(
-                'flex items-center gap-2 px-3 py-1.5 rounded-full text-xs font-medium duration-300',
+                'flex items-center gap-2 px-3 py-1.5 rounded-full text-xs font-medium',
                 saveMessage?.includes('Error')
                   ? 'bg-red-500/10 text-red-500'
                   : isDark

src/components/EmojiPicker.tsx

@@ -4,6 +4,7 @@ import { clsx } from 'clsx'
 import { Clock } from 'lucide-react'
 import { useEmojiPicker } from '../hooks/useEmojiPicker'
 import { SearchBar } from './common/SearchBar'
+import { SectionHeader } from './common/SectionHeader'
 import type { Emoji } from '../services/emojiService'
 
 import { PickerLayout } from './common/PickerLayout'
@@ -239,11 +240,8 @@ export function EmojiPicker({ isDark, opacity }: EmojiPickerProps) {
           {/* Recent emojis (only show when not searching) */}
           {!searchQuery && recentEmojis.length > 0 && (
             <div className="px-3 pb-2 flex-shrink-0">
-              <div className="flex items-center gap-1.5 mb-1.5">
-                <Clock className="w-3 h-3 dark:text-win11-text-tertiary text-win11Light-text-secondary" />
-                <span className="text-xs dark:text-win11-text-tertiary text-win11Light-text-secondary">
-                  Recently used
-                </span>
+              <div className="mb-1.5">
+                <SectionHeader icon={<Clock size={12} />} label="Recently used" />
               </div>
               <div
                 ref={recentGridRef}

src/components/GifPicker.tsx

@@ -4,6 +4,7 @@ import { clsx } from 'clsx'
 import { Search, RefreshCw, TrendingUp } from 'lucide-react'
 import { useGifPicker } from '../hooks/useGifPicker'
 import { SearchBar } from './common/SearchBar'
+import { SectionHeader } from './common/SectionHeader'
 import type { Gif } from '../types/gif'
 import { getTertiaryBackgroundStyle } from '../utils/themeUtils'
 
@@ -320,19 +321,20 @@ export function GifPicker({ isDark, opacity }: GifPickerProps) {
         />
       }
       subHeader={
-        <div className="flex items-center gap-2 text-xs dark:text-win11-text-secondary text-win11Light-text-secondary">
+        <div className="px-3 pb-2 flex-shrink-0">
           {searchQuery ? (
-            <>
-              <Search size={12} />
-              <span>Results for "{searchQuery}"</span>
-            </>
+            <SectionHeader
+              icon={<Search size={12} />}
+              label={`Results for "${searchQuery}"`}
+              rightContent={isLoading && <RefreshCw size={12} className="animate-spin" />}
+            />
           ) : (
-            <>
-              <TrendingUp size={12} />
-              <span>Trending GIFs</span>
-            </>
+            <SectionHeader
+              icon={<TrendingUp size={12} />}
+              label="Trending GIFs"
+              rightContent={isLoading && <RefreshCw size={12} className="animate-spin" />}
+            />
           )}
-          {isLoading && <RefreshCw size={12} className="animate-spin ml-auto" />}
         </div>
       }
       footer={

src/components/SymbolPicker.tsx

@@ -4,6 +4,7 @@ import { clsx } from 'clsx'
 import { Clock } from 'lucide-react'
 import { useSymbolPicker } from '../hooks/useSymbolPicker'
 import { SearchBar } from './common/SearchBar'
+import { SectionHeader } from './common/SectionHeader'
 import type { SymbolItem } from '../services/symbolService'
 
 import { PickerLayout } from './common/PickerLayout'
@@ -229,11 +230,8 @@ export function SymbolPicker({ isDark, opacity }: SymbolPickerProps) {
           {/* Recent symbols */}
           {!searchQuery && !selectedCategory && recentSymbols.length > 0 && (
             <div className="px-3 pb-2 flex-shrink-0">
-              <div className="flex items-center gap-1.5 mb-1.5">
-                <Clock className="w-3 h-3 dark:text-win11-text-tertiary text-win11Light-text-secondary" />
-                <span className="text-xs dark:text-win11-text-tertiary text-win11Light-text-secondary">
-                  Recently used
-                </span>
+              <div className="mb-1.5">
+                <SectionHeader icon={<Clock size={12} />} label="Recently used" />
               </div>
               <div ref={recentGridRef} className="flex flex-wrap gap-1">
                 {recentSymbols.slice(0, 16).map((symbol, index) => (

src/components/common/SectionHeader.tsx

@@ -0,0 +1,32 @@
+import { type ReactNode } from 'react'
+import { clsx } from 'clsx'
+
+export interface SectionHeaderProps {
+  /** Icon to display (e.g., <TrendingUp size={12} /> or <Clock size={12} />) */
+  icon?: ReactNode
+  /** Label content to display (supports text, styled elements, or localization components) */
+  label: ReactNode
+  /** Additional content to display on the right (e.g., loading spinner) */
+  rightContent?: ReactNode
+  /** Additional CSS classes */
+  className?: string
+}
+
+/**
+ * Shared component for section headers like "Trending GIFs" and "Recently used"
+ */
+export function SectionHeader({ icon, label, rightContent, className }: SectionHeaderProps) {
+  return (
+    <div
+      className={clsx(
+        'flex items-center gap-1.5 text-xs',
+        'dark:text-win11-text-tertiary text-win11Light-text-tertiary',
+        className
+      )}
+    >
+      {icon}
+      <span>{label}</span>
+      {rightContent && <div className="ml-auto">{rightContent}</div>}
+    </div>
+  )
+}