Lohnt sich dein eigenes Akiflow?

Build me a daily planner with time blocking to replace Akiflow. Requirements:

- Local web app: Node + Express + better-sqlite3; the day/week grid is
  FullCalendar with vanilla JS, no build step.
- A capture inbox: one text box, Enter saves a task; tasks have title,
  minutes estimate (default 30), and a done flag.
- Drag a task from the inbox sidebar onto the grid to create a time block;
  drag to move or resize; block and task stay linked, completing one
  completes the other.
- My real calendar shows behind the blocks as a read-only overlay of ICS
  feed URLs from .env; Google Calendar's secret ICS address works and needs
  no OAuth.
- Keyboard-first: n for new task, t for today, arrows move selection, Enter
  schedules the selected task into the next free slot.
- Morning rollover: unfinished blocks from yesterday return to the inbox
  with a reschedule counter, so chronically avoided tasks are visible.
- SQLite storage, localhost only, no accounts, no telemetry.
- Out of scope: two-way Google/Outlook sync and pulling tasks in from other
  apps. Read-only overlay only; OAuth plus sync-conflict handling is exactly
  the maintenance that makes Akiflow worth paying for.
- README: how to find a calendar's secret ICS URL.