chore(main): release 4.0.0

[github-actions]

🤖 I have created a release beep boop

4.0.0 (2026-06-19)

⚠ BREAKING CHANGES

• The Homie MQTT protocol has been removed entirely. The controller now exclusively uses Home Assistant MQTT Discovery.

Features

• add Home Assistant climate/thermostat MQTT entity (d5daeb9)
• add mDNS responder for pool-controller.local discovery (#95) (b1252e7)
• convert WebUI to Progressive Web App (PWA) (b2f05d1)
• docs: add KiCad 9.0 schematic generator and PDF exports (#104) (ff46191)
• docs: Add Quick Start Guide, FAQ, and Safety Warnings (#107) (b0152e1)
• mqtt: set HA entity_category for all discovery entities (375f40f)
• norvi: add OLED display with 4 info pages, button navigation, and QR code (34681e2)
• OLED Menu-Navigation, Sensor-Mapping in WebUI+HA, mDNS (f72bbe2)
• optimierte Pin-Belegung (GPIO32/33/25/26) + Status-LED mit Homie-Blinkcodes (c6ef387)
• temperature-based circulation time with continuous extension (b16a9d0)
• ui: add About section in More bottom sheet (5919624)
• ui: iOS-style bottom tab bar with glassmorphism (38eec43)
• web: add temperature-based circulation parameters to Web UI (963bcde)
• web: format effective runtime as duration in WebUI and HA (b460b4f)

Bug Fixes

• add native test infrastructure with ASan and coverage reporting (#98) (1421a39)
• docs synced de/en (909304d)
• ha: select-Entity-Status ohne Temperatur publishen (e6f32d7)
• ha: Sensor-Mapping Discovery bei jedem MQTT-Reconnect publishen (1ab82d9)
• mqtt: prevent dangling pointer and duplicate callback on reconnect (25090d7)
• restore telemetry updates and HA entity visibility (716dfe6)
• review findings for temperature-based circulation (8784f25)
• ui: display dashboard thresholds without-auth via /api/status, 4-across mode cards (e68d4bf)
• web: clarify that timer start/end also applies in Auto mode (5985a00)

Miscellaneous Chores

• remove deprecated Homie references across codebase (1df0705)

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