feat: add Tags section to combine_contexts() for insight context

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ai/insight_generator.rs

@@ -15,9 +15,9 @@ use crate::database::models::InsertPhotoInsight;
 use crate::database::{
     CalendarEventDao, DailySummaryDao, ExifDao, InsightDao, LocationHistoryDao, SearchHistoryDao,
 };
-use crate::tags::TagDao;
 use crate::memories::extract_date_from_filename;
 use crate::otel::global_tracer;
+use crate::tags::TagDao;
 use crate::utils::normalize_path;
 
 #[derive(Deserialize)]
@@ -589,6 +589,7 @@ impl InsightGenerator {
         calendar: Option<String>,
         location: Option<String>,
         search: Option<String>,
+        tags: Option<String>,
     ) -> String {
         let mut parts = Vec::new();
 
@@ -604,6 +605,9 @@ impl InsightGenerator {
         if let Some(s) = search {
             parts.push(format!("## Searches\n{}", s));
         }
+        if let Some(t) = tags {
+            parts.push(format!("## Tags\n{}", t));
+        }
 
         if parts.is_empty() {
             "No additional context available".to_string()
@@ -955,6 +959,7 @@ impl InsightGenerator {
             calendar_context,
             location_context,
             search_context,
+            None, // tags — wired up in Task 5
         );
 
         log::info!(
@@ -1301,3 +1306,38 @@ Return ONLY the summary, nothing else."#,
         data.display_name
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn combine_contexts_includes_tags_section_when_tags_present() {
+        let result = InsightGenerator::combine_contexts(
+            None,
+            None,
+            None,
+            None,
+            Some("vacation, hiking, mountains".to_string()),
+        );
+        assert!(result.contains("## Tags"), "Should include Tags section");
+        assert!(result.contains("vacation, hiking, mountains"), "Should include tag names");
+    }
+
+    #[test]
+    fn combine_contexts_omits_tags_section_when_no_tags() {
+        let result = InsightGenerator::combine_contexts(
+            Some("some messages".to_string()),
+            None, None, None,
+            None, // no tags
+        );
+        assert!(!result.contains("## Tags"), "Should not include Tags section when None");
+        assert!(result.contains("## Messages"), "Should still include Messages");
+    }
+
+    #[test]
+    fn combine_contexts_returns_no_context_message_when_all_none() {
+        let result = InsightGenerator::combine_contexts(None, None, None, None, None);
+        assert_eq!(result, "No additional context available");
+    }
+}