frontend: add scaffolding for favorites tab

frontend/src/components/App.tsx

@@ -2,8 +2,21 @@ import React, { useState, useEffect, useCallback } from 'react';
 import SongTable from './SongTable';
 import NowPlaying from './NowPlaying';
 import AddSongPanel from './AddSongPanel';
+import { TabView, Tab } from './TabView';
 import { API, getDisplayTitle, PlaylistItem } from '../api/player';
 import { useEventWebSocket } from '../hooks/useEventWebsocket';
+import { FaMusic, FaHeart } from 'react-icons/fa';
+
+enum Tabs {
+  Playlist = "playlist",
+  Favorites = "favorites",
+}
+
+const EmptyContent: React.FC<{ label: string}> = ({label}) => (
+  <div className="flex items-center justify-center h-full">
+    <div className="text-white text-2xl font-bold">{label}</div>
+  </div>
+);
 
 const App: React.FC = () => {
   const [isPlaying, setIsPlaying] = useState(false);
@@ -12,6 +25,7 @@ const App: React.FC = () => {
   const [volume, setVolume] = useState(100);
   const [volumeSettingIsLocked, setVolumeSettingIsLocked] = useState(false);
   const [songs, setSongs] = useState<PlaylistItem[]>([]);
+  const [selectedTab, setSelectedTab] = useState<Tabs>(Tabs.Playlist);
 
   const fetchPlaylist = useCallback(async () => {
     const playlist = await API.getPlaylist();
@@ -122,6 +136,19 @@ const App: React.FC = () => {
     fetchNowPlaying();
   }, [fetchPlaylist, fetchNowPlaying]);
 
+  const playlistContent = (
+    songs.length > 0 ? (
+      <SongTable 
+        songs={songs}
+        isPlaying={isPlaying}
+        onDelete={handleDelete} 
+        onSkipTo={handleSkipTo} 
+      />
+    ) : (
+      <EmptyContent label="Playlist is empty" />
+    )
+  );
+
   return (
     <div className="flex items-center justify-center h-screen w-screen bg-black md:py-10">
       <div className="bg-violet-900 w-full md:max-w-2xl h-full md:max-h-xl md:border md:rounded-2xl flex flex-col">
@@ -139,18 +166,14 @@ const App: React.FC = () => {
           onVolumeDidChange={() => setVolumeSettingIsLocked(false)}
         />
 
-        {songs.length > 0 ? (
-          <SongTable 
-            songs={songs}
-            isPlaying={isPlaying}
-            onDelete={handleDelete} 
-            onSkipTo={handleSkipTo} 
-          />
-        ) : (
-          <div className="flex items-center justify-center h-full">
-            <div className="text-white text-2xl font-bold">Playlist is empty</div>
-          </div>
-        )}
+        <TabView selectedTab={selectedTab} onTabChange={setSelectedTab}>
+          <Tab label="Playlist" identifier={Tabs.Playlist} icon={<FaMusic />}>
+            {playlistContent}
+          </Tab>
+          <Tab label="Favorites" identifier={Tabs.Favorites} icon={<FaHeart />}>
+            <EmptyContent label="Favorites are not implemented yet" />
+          </Tab>
+        </TabView>
 
         <AddSongPanel onAddURL={handleAddURL} />
       </div>

frontend/src/components/SongRow.tsx

@@ -40,7 +40,7 @@ const SongRow: React.FC<SongRowProps> = ({ song, playState, onDelete, onPlay })
   
   return (
     <div className={classNames("flex flex-row w-full h-24 px-2 py-5 items-center border-b gap-2 transition-colors", {
-      "bg-black/10": (playState === PlayState.Playing || playState === PlayState.Paused),
+      "qc-highlighted": (playState === PlayState.Playing || playState === PlayState.Paused),
       "bg-black/30": playState === PlayState.NotPlaying,
     })}>
       <div className="flex flex-row gap-2">
@@ -78,7 +78,7 @@ const SongRow: React.FC<SongRowProps> = ({ song, playState, onDelete, onPlay })
       <div className="flex flex-row gap-2">
         <button
           ref={buttonRef}
-          className="text-red-500 px-3 py-1 bg-red-500/10 rounded"
+          className="text-red-100 px-3 py-1 bg-red-500/40 rounded"
           onClick={(e) => {
             e.stopPropagation();
             if (showDeleteConfirm) {

frontend/src/components/TabView.tsx

@@ -0,0 +1,64 @@
+import React, { ReactNode } from 'react';
+import classNames from 'classnames';
+
+interface TabProps<T> {
+  label: string;
+  identifier: T;
+  icon?: ReactNode;
+  children: ReactNode;
+}
+
+export const Tab = <T,>({ children }: TabProps<T>) => {
+  // Wrapper component
+  return <>{children}</>;
+};
+
+interface TabViewProps<T> {
+  children: ReactNode;
+  selectedTab: T;
+  onTabChange: (tab: T) => void;
+}
+
+export const TabView = <T,>({ children, selectedTab, onTabChange }: TabViewProps<T>) => {
+  // Filter and validate children to only get Tab components
+  const tabs = React.Children.toArray(children).filter(
+    (child) => React.isValidElement(child) && child.type === Tab
+  ) as React.ReactElement<TabProps<T>>[];
+
+  return (
+    <div className="flex flex-col h-full">
+      <div className="flex flex-row h-11 border-b border-white/20">
+        {tabs.map((tab, index) => {
+          const isSelected = selectedTab === tab.props.identifier;
+          const rowClassName = classNames(
+            "flex flex-row items-center justify-center w-full gap-2 text-white",
+            { "qc-highlighted": isSelected }
+          );
+
+          return (
+            <div
+              key={index}
+              className={rowClassName}
+              onClick={() => onTabChange(tab.props.identifier)}
+            >
+              {tab.props.icon}
+              <div className="text-sm font-bold">{tab.props.label}</div>
+            </div>
+          );
+        })}
+      </div>
+      <div className="flex-1">
+        {tabs.map((tab, index) => (
+          <div
+            key={index}
+            className={classNames("w-full h-full", {
+              hidden: selectedTab !== tab.props.identifier,
+            })}
+          >
+            {tab.props.children}
+          </div>
+        ))}
+      </div>
+    </div>
+  );
+}; 

frontend/src/index.css

@@ -8,4 +8,8 @@
             [&::-webkit-slider-thumb]:rounded-full
             hover:[&::-webkit-slider-thumb]:bg-violet-300;
     }
+
+    .qc-highlighted {
+        @apply shadow-[inset_0_0_35px_rgba(147,51,234,0.8)];
+    }
 }