test: add more integration tests

Author: ivan-lednev

fixtures/fixture-vault/2025-07-28.md

@@ -0,0 +1,14 @@
+This file contains some invalid markdown that we see in user templates. It should not be changed during editing.
+
+# Dreams
+
+- 
+
+# Day planner
+
+- [ ] 10:00 - 11:00 Before
+- [ ] 09:00 - 10:00 Parent
+  Parent text
+    - [ ] Child
+      Child text
+- [ ] 12:00 - 13:00 After

fixtures/fixture-vault/tasks.md

@@ -0,0 +1,5 @@
+- [ ] Before
+- [ ] Task without time ⏳ 2025-07-19
+  Some text
+- [ ] 10:00 - 10:30 Task with time ⏳ 2025-07-19
+- [ ] After