Refactor components to use StyledButton for consistent button styling

- Replaced custom button implementations with StyledButton in various components including DetailScreen, HomeScreen, SearchScreen, and SettingsModal.
- Updated button styles and behaviors to align with the new StyledButton component.
- Removed the obsolete DetailButton component to streamline the codebase.

components/NextEpisodeOverlay.tsx

@@ -1,16 +1,14 @@
 import React from "react";
-import { View, StyleSheet, TouchableOpacity } from "react-native";
+import { View, StyleSheet } from "react-native";
 import { ThemedText } from "@/components/ThemedText";
+import { StyledButton } from "./StyledButton";
 
 interface NextEpisodeOverlayProps {
   visible: boolean;
   onCancel: () => void;
 }
 
-export const NextEpisodeOverlay: React.FC<NextEpisodeOverlayProps> = ({
-  visible,
-  onCancel,
-}) => {
+export const NextEpisodeOverlay: React.FC<NextEpisodeOverlayProps> = ({ visible, onCancel }) => {
   if (!visible) {
     return null;
   }
@@ -18,12 +16,13 @@ export const NextEpisodeOverlay: React.FC<NextEpisodeOverlayProps> = ({
   return (
     <View style={styles.nextEpisodeOverlay}>
       <View style={styles.nextEpisodeContent}>
-        <ThemedText style={styles.nextEpisodeTitle}>
-          即将播放下一集...
-        </ThemedText>
-        <TouchableOpacity style={styles.nextEpisodeButton} onPress={onCancel}>
-          <ThemedText style={styles.nextEpisodeButtonText}>取消</ThemedText>
-        </TouchableOpacity>
+        <ThemedText style={styles.nextEpisodeTitle}>即将播放下一集...</ThemedText>
+        <StyledButton
+          text="取消"
+          onPress={onCancel}
+          style={styles.nextEpisodeButton}
+          textStyle={styles.nextEpisodeButtonText}
+        />
       </View>
     </View>
   );
@@ -48,10 +47,8 @@ const styles = StyleSheet.create({
     marginBottom: 10,
   },
   nextEpisodeButton: {
-    backgroundColor: "#333",
     padding: 8,
     paddingHorizontal: 15,
-    borderRadius: 5,
   },
   nextEpisodeButtonText: {
     fontSize: 14,