feat: handle CwdChanged and FileChanged hook events (closes #253)

src-tauri/src/types.rs

@@ -318,6 +318,20 @@ pub struct PostCompactEvent {
     pub conversation_id: Option<String>,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CwdChangedEvent {
+    pub cwd: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub conversation_id: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct FileChangedEvent {
+    pub file: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub conversation_id: Option<String>,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct AgentStartEvent {
     pub tool_use_id: String,
@@ -741,4 +755,52 @@ mod tests {
         assert!(serialized.contains("\"session_id\":\"sess-xyz\""));
         assert!(!serialized.contains("conversation_id"));
     }
+
+    #[test]
+    fn test_cwd_changed_event_serialization() {
+        let event = CwdChangedEvent {
+            cwd: "/home/naomi/code/my-project".to_string(),
+            conversation_id: Some("conv-abc".to_string()),
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"cwd\":\"/home/naomi/code/my-project\""));
+        assert!(serialized.contains("\"conversation_id\":\"conv-abc\""));
+    }
+
+    #[test]
+    fn test_cwd_changed_event_omits_none_fields() {
+        let event = CwdChangedEvent {
+            cwd: "/tmp/workspace".to_string(),
+            conversation_id: None,
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"cwd\":\"/tmp/workspace\""));
+        assert!(!serialized.contains("conversation_id"));
+    }
+
+    #[test]
+    fn test_file_changed_event_serialization() {
+        let event = FileChangedEvent {
+            file: "/home/naomi/code/my-project/src/main.rs".to_string(),
+            conversation_id: Some("conv-abc".to_string()),
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"file\":\"/home/naomi/code/my-project/src/main.rs\""));
+        assert!(serialized.contains("\"conversation_id\":\"conv-abc\""));
+    }
+
+    #[test]
+    fn test_file_changed_event_omits_none_fields() {
+        let event = FileChangedEvent {
+            file: "/tmp/test.txt".to_string(),
+            conversation_id: None,
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"file\":\"/tmp/test.txt\""));
+        assert!(!serialized.contains("conversation_id"));
+    }
 }