feat(KB-228): add schedule time presets

- Add morning, afternoon, evening, and night preset schedules to core automation types
- Update ScheduleForm with preset selection dropdown and time handling
- Add color coding for different schedule types in ScheduleCard
- Add tests for new schedule preset functionality
- Include changeset for release tracking

.changeset/add-schedule-time-presets.md

@@ -0,0 +1,14 @@
+---
+"@dustinbyrne/kb": minor
+---
+
+Add 6 new schedule preset options for more granular time intervals
+
+- Every 15 minutes (`*/15 * * * *`)
+- Every 30 minutes (`*/30 * * * *`)
+- Every 2 hours (`0 */2 * * *`)
+- Every 6 hours (`0 */6 * * *`)
+- Every 12 hours (`0 */12 * * *`)
+- Weekdays at 9 AM (`0 9 * * 1-5`)
+
+Each preset includes its own color badge for visual distinction in the schedule card view.