Add LLM digest setup and share timestamp context

lib/features/ai_digest/application/llm_digest_text_client.dart

@@ -5,6 +5,7 @@ abstract interface class LlmDigestTextClient {
   Future<String> complete({
     required String systemPrompt,
     required String userPrompt,
+    bool enableWebSearch = false,
   });
 }
 
@@ -17,10 +18,12 @@ class ConfiguredLlmDigestTextClient implements LlmDigestTextClient {
   Future<String> complete({
     required String systemPrompt,
     required String userPrompt,
+    bool enableWebSearch = false,
   }) {
     return _service.completeText(
       systemPrompt: systemPrompt,
       userPrompt: userPrompt,
+      enableWebSearch: enableWebSearch,
     );
   }
 }