style(search): Theme search field in toolbar

AI-assistant: Claude Code v2.1.138 (Claude Sonnet 4.6)
Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

Author: AndyScherzinger

app/src/main/java/com/nextcloud/talk/chat/ChatActivity.kt

@@ -3476,6 +3476,7 @@ class ChatActivity :
         actionView.queryHint = getString(R.string.message_search_hint)
         actionView.isIconified = false
         actionView.maxWidth = Int.MAX_VALUE
+        viewThemeUtils.talk.themeSearchView(actionView)
         actionView.requestFocus()
         window.decorView.post {
             val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager