Todo: daily reminders at fixed time, no date, simplified sidebar

- Remove date field; due_time is now required
- Cron repeats daily via notified_date (resets at midnight)
- Remove Today/Upcoming/Overdue smart views from sidebar
- Task card shows bell icon + time instead of date labels
- Creation no longer sends immediate Discord notification (cron only)

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

docker/schema_family.sql

@@ -336,6 +336,7 @@ CREATE TABLE IF NOT EXISTS pf_todos (
   due_date   DATE DEFAULT NULL,
   due_time   TIME DEFAULT NULL,
   notified   TINYINT(1) DEFAULT 0,
+  notified_date DATE DEFAULT NULL,
   priority   ENUM('none','low','medium','high') DEFAULT 'none',
   done       TINYINT(1) DEFAULT 0,
   done_at    DATETIME DEFAULT NULL,