- add period-scoped holiday architecture end-to-end
- model: scope `SchoolHoliday` to `academic_period_id`
- migrations: add holiday-period scoping, academic-period archive lifecycle, and merge migration head
- API: extend holidays with manual CRUD, period validation, duplicate prevention, and overlap merge/conflict handling
- recurrence: regenerate holiday exceptions using period-scoped holiday sets
- improve frontend settings and holiday workflows
- bind holiday import/list/manual CRUD to selected academic period
- show detailed import outcomes (inserted/updated/merged/skipped/conflicts)
- fix file-picker UX (visible selected filename)
- align settings controls/dialogs with defined frontend design rules
- scope appointments/dashboard holiday loading to active period
- add shared date formatting utility
- strengthen academic period lifecycle handling
- add archive/restore/delete flow and backend validations/blocker checks
- extend API client support for lifecycle operations
- release/docs updates and cleanup
- bump user-facing version to `2026.1.0-alpha.15` with new changelog entry
- add tech changelog entry for alpha.15 backend changes
- refactor README to concise index and archive historical implementation docs
- fix Copilot instruction link diagnostics via local `.github` design-rules reference
Dashboard
Add top-right user dropdown using Syncfusion DropDownButton: shows username + role; menu entries “Profil” and “Abmelden”.
Replace custom dropdown logic with Syncfusion component; position at header’s right edge.
Update /logout page to call backend logout and redirect to /login (reliable user switching).
Build/Config
Add @syncfusion/ej2-react-splitbuttons and @syncfusion/ej2-splitbuttons dependencies.
Update Vite optimizeDeps.include to pre-bundle splitbuttons and avoid import-analysis errors.
Docs
README: Rework Architecture Overview with clearer data flow:
Listener consumes MQTT (discovery/heartbeats) and updates API.
Scheduler reads from API and publishes events via MQTT to clients.
Clients send via MQTT and receive via MQTT.
Worker receives commands directly from API and reports results back (no MQTT).
Explicit note: MariaDB is accessed exclusively by the API Server; Dashboard never talks to DB directly.
README: Add SplitButtons to “Syncfusion Components Used”; add troubleshooting steps for @syncfusion/ej2-react-splitbuttons import issues (optimizeDeps + volume reset).
Copilot instructions: Document header user menu and splitbuttons technical notes (deps, optimizeDeps, dev-container node_modules volume).
Program info
Bump to 2025.1.0-alpha.10 with changelog:
UI: Header user menu (DropDownButton with username/role; Profil/Abmelden).
Frontend: Syncfusion SplitButtons integration + Vite pre-bundling config.
Fix: Added README guidance for splitbuttons import errors.
No breaking changes.
