fix(tests): update test fixtures to match current schema

Test compilation failed due to outdated test fixtures after schema changes.

Fixed:
- models/mod.rs: Project struct now has id: String (was i64), path: Option<String>
  (was String), removed session_count and last_opened_at fields, added updated_at
- error.rs: AppError::NotFound expects String, not &str

All tests now compile and pass.

Author: kevinnft

src-tauri/src/error.rs

@@ -92,7 +92,7 @@ mod tests {
 
     #[test]
     fn test_error_to_string() {
-        let err: String = AppError::NotFound("test").into();
+        let err: String = AppError::NotFound("test".to_string()).into();
         assert_eq!(err, "Not found: test");
     }
 }

src-tauri/src/models/mod.rs

@@ -27,12 +27,11 @@ mod tests {
     #[test]
     fn test_project_serialization() {
         let p = Project {
-            id: 1,
+            id: "test-id-123".to_string(),
             name: "test-project".to_string(),
-            path: "/home/test/project".to_string(),
-            session_count: 0,
-            last_opened_at: "2025-01-01T00:00:00Z".to_string(),
+            path: Some("/home/test/project".to_string()),
             created_at: "2025-01-01T00:00:00Z".to_string(),
+            updated_at: "2025-01-01T00:00:00Z".to_string(),
         };
         let json = serde_json::to_string(&p).unwrap();
         assert!(json.contains("test-project"));