Schoolbord: image 0.0.24 gepind in app-versie 0.0.24

Eigen agenda (migratie 28), losse agendapunten voor Basis en bladeren op
Overzicht; de release note vraagt eerst om een backup. Digest gecontroleerd
bij het register; store-tests groen (110 en de release-bump-test).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

whatsnext-schoolbord/umbrel-app.yml

@@ -13,7 +13,7 @@ storage:
   dataRoot: data
 category: finance
 name: Schoolbord
-version: "0.0.23"
+version: "0.0.24"
 tagline: Tenants, agreements and monthly invoices for a small venue
 description: >-
   Schoolbord keeps the people of a small venue, the agreements made with them, and what follows
@@ -26,13 +26,20 @@ description: >-
   It has its own login and was made for Schooltje Boschoord; it speaks Dutch. Everything stays in your
   app folder on your Umbrel and goes along with your Umbrel backup.
 releaseNotes: >-
+  Brings a database step: make a backup first. New under Systeem, for every login: Eigen agenda, a
+  private link that puts the agenda in your own calendar app (Google, Apple, Outlook), with only the
+  moments you are part of or the whole agenda. It is off until you turn it on, works without logging
+  in, and "Nieuwe link" makes the old one stop at once; use the address from outside, not the one at
+  home. A basic login can now add, change and remove free agenda items, with Thermostaat and Website.
+  On Overzicht the agenda pages back and forward by week or month. Coming from 0.0.22 or earlier, it
+  also brings the following.
   Fixes two things on Afspraken. An agreement whose day part had later been made narrower could no
   longer be changed at all, not even its link or its thermostat ("De tijden vallen buiten ..."); now
   a narrower day part moves what no longer fits to the shortest day part it does fit, or none, and a
   database step repairs what already stood outside its part. And the switch Thermostaat in the edit
   row is saved again. On Personen, mailing a role is an envelope next to the plus, and a basic login
   sees a person's agreements and website defaults without invoices or amounts. Coming from 0.0.21 or
-  earlier, it also brings the following, with two more database steps: make a backup first.
+  earlier, it also brings the following, with two more database steps.
   What goes to the website is now clear
   everywhere: every person, agreement and moment on the agenda shows in its drawer whether it is on
   the website, why not, and where its title, link and price come from. The switch Website works per