fix(search): keep PROCESS_TEXT on the results screen

handleExternalSearch auto-opened the article on an exact match, so the main
screen with the search bar flashed before the article covered it. Only set
the query; the article now opens from the results list.

app/src/main/java/com/example/research/feature/search/SearchViewModel.kt

@@ -321,11 +321,7 @@ class SearchViewModel(
     }
 
     fun handleExternalSearch(text: String) {
-        viewModelScope.launch {
-            val sanitizedText = text.sanitizeQuery()
-            mutableSearchQuery.value = sanitizedText
-            searchAndLoadArticle(sanitizedText)
-        }
+        onSearchQueryChanged(text)
     }
 
     companion object {