fix: correct Ctrl+C detection in terminal UI

Changed from checking ord_c == 67 ('C') to ord_c == 3 (Ctrl+C control character)

Author: jeanCarloMachado

python_search/search/search_ui/terminal_ui.py

@@ -371,7 +371,8 @@ def process_chars(self, c: str) -> bool:
             self.scroll_offset = 0
             # Reset query history browsing when clearing query
             self.query_history_index = -1
-        elif ord_c == 67:
+        elif ord_c == 3:
+            # Ctrl+C - exit
             sys.exit(0)
         elif ord_c == 92 or c == "]":
             self._setup_entries()