Add search UI feedback and hide button to search/replace plugin

- Add visual feedback styling for search states (searching, success, fail)
- Show match count in status label when searching
- Add hide (X) button to hide search panel
- Fix typo: stateus_lbl → status_lbl
- Add _set_find_options_lbl to display active search options

plugins/code/search_replace/mixins/search_mixin.py

@@ -32,6 +32,8 @@ class SearchMixin:
 
 
     def _find_all_matches(self, search_text, buffer):
+        self.update_style(0)
+
         self.matches.clear()
         self.current_index = -1