Add stream and topic search context.

Author: theViz343

zulipterminal/ui_tools/boxes.py

@@ -969,7 +969,13 @@ def __init__(
     ) -> None:
         self.panel_view = panel_view
         self.search_command = search_command
-        self.search_text = f" Search [{', '.join(keys_for_command(search_command))}]: "
+        if search_command == "SEARCH_STREAMS" or search_command == "SEARCH_TOPICS":
+            search_item = self.search_command.split("_")[1].lower()
+            self.search_text = f" Search {search_item} [{', '.join(keys_for_command(search_command))}]: "  # noqa: E501
+        else:
+            self.search_text = (
+                f" Search [{', '.join(keys_for_command(search_command))}]: "
+            )
         self.search_error = urwid.AttrMap(
             urwid.Text([" ", INVALID_MARKER, " No Results"]), "search_error"
         )