fix: 搜索框默认文本

app/src/main/res/values-zh-rHK/strings.xml

@@ -78,6 +78,7 @@
     <string name="version">版本</string>
     <string name="local">本地</string>
     <string name="search">搜尋</string>
+    <string name="search_placeholder">搜尋…</string>
     <string name="input_search_key">Input search keyword</string>
     <string name="origin_format">來源: %s</string>
     <string name="read_dur_progress">最近: %s</string>