chore(main): release 0.4.0

[petejohanson]

🤖 I have created a release beep boop

0.4.0 (2026-04-15)

⚠ BREAKING CHANGES

• Move to zephyr v4.1 (#3060)
• core: Allow layer behaviors to "lock" layers on (feat: Allow layer behaviors to "lock" layers on #2717)

Features

• Add double tap to enter bootloader functionality (c06fa48)
• Add LED indicator support (#3239) (197f899)
• Add nBOOT_SEL bit setup for STM32 G0/C0 targets (f85ec7e)
• Add ZMK_BOARD_COMPAT Kconfig symbol, and check for it (a23aa00)
• Allow layer behaviors to "lock" layers on (feat: Allow layer behaviors to "lock" layers on #2717) (5138c6f)
• behaviors: add &out OUT_NONE (#3235) (8a44ef1)
• behaviors: Add retention boot mode to reset. (c06fa48)
• ble: Use appearance set in the BT_DEVICE_APPEARANCE config (#3115) (ad7fbfe)
• boards/shields: Add settings for Rpi Pico and add tester_rpi_pico shield (#2900) (ccf20a1)
• boards: Add Kconfig for nrf52840dongle ZMK board variant (#3284) (a1aca03)
• boards: add support for nrf52840dongle_nrf52840 (#3011) (c7fae18)
• core: (Optionally) use Zephyr keyboard input devices (c06fa48)
• core: mapper for magic bootloader values. (c06fa48)
• display: Add thread name to dedicated display queue. (c06fa48)
• docs: Update New Behavior Guide (#3107) (e34793e)
• endpoints: add "no endpoint" value (6e7e0de)
• endpoints: add "no endpoint" value (#3140) (6e7e0de)
• layouts: Add physical layout for Redox shield (61de01a)
• Move to zephyr v4.1 (#3060) (c06fa48)
• pointing: Handle INPUT_BTN_TOUCH codes for mouse buttons (c06fa48)
• pointing: Release pressed keys on disconnect (#3204) (24487bd)
• shields: Add Studio support to boardsource3x4 (#3154) (40e06f3)
• split: Add HID indicators and physical layout set to Wired split (#3103) (7738924)

Bug Fixes

• Add "optional" folder to .gitignore (#3141) (c099041)
• behaviors: correctly handle sensor rotation remainder (#3084) (958fa78)
• boards: Add xiao_ble sd_partition label for nosd snippet compat (c06fa48)
• boards: Fix pillbug board.yml to report extension (a23aa00)
• boards: Properly note ZMK compat for xiao_rp2040/zmk variant (#3326) (0331b7d)
• boards: Remove nano overlays for old nice_nano_v2 board ID. (c06fa48)
• boards: Remove some references to old nice_nano_v2 board ID. (c06fa48)
• boards: Retore bootloader support on XIAO BLE. (c06fa48)
• ci: Better safeguards for ZMK variant build check (#3277) (8feeb52)
• ci: disable nrf5340dk from being built in our CI (#3066) (522971f)
• ci: Fix release please template bump (#3021) (f3233c1)
• ci: Pin @actions/artifact to a compatible release (#3230) (ada1542)
• ci: Prevent slash characters in artifact names. (c06fa48)
• ci: Skip build on empty build matrix (#3271) (df2e979), closes #3179
• core: Don't force CBPRINTF_NANO, for proper formatting. (c06fa48)
• core: Generate correct keymap layer names for all builds (#3047) (0b5a103), closes #3045
• core: One tick kscan wait on RP2350 (#3255) (9278505)
• core: Set a system work queue stack size of 2048 by default (c06fa48)
• core: support magic bootloader values for nRF52833 (#3163) (308de56)
• Disable Nordic dt-bindings header checks. (c06fa48)
• display: add serial VCOM inversion for Nice! View (#3294) (3538843)
• display: Adjust stack sizes for display usage. (c06fa48)
• display: Fix setting the small font for the mono theme. (c06fa48)
• display: port nice!view display code (c06fa48)
• docs: Improve ZMK setup instructions (#3209) (354cff9)
• docs: Tweak layer tap example to be clearer (#3023) (919bce7)
• Don't enable ZMK Display by default for a few shields (c06fa48)
• endpoints: Add endpoint setting upgrade (6e7e0de)
• Fix redundant const warning (#3139) (8987f39)
• hid: initialize missing d_scroll_x field in mouse report (#3196) (abce9de)
• keymap: Fix overflow in get/set bindings (#3205) (ab46f48)
• nice!view built-in widgets render failure from insufficient memory (#3243) (536375e), closes #3219
• pointing: Refactor for changes to input API (c06fa48)
• Refactor for new Zephyr PM API (c06fa48)
• Remove usage of renamed Kconfig from core coverage. (c06fa48)
• replace removed K_THREAD_STACK_MEMBER with K_KERNEL_STACK_MEMBER (#3218) (f6c629e)
• sensors: Initialize sensor data to 0 before fetching. (c06fa48)
• Set default transport according to enabled transports (6e7e0de)
• shields: Proper transparent binding in sofle raise layer (#3238) (5cfc67a)
• split: correct async UART RX buffer definition (#3193) (36dbf46)
• split: int to pointer cast in bas proxy (#3105) (ece2ce1)
• split: Properly return from command handler (#3120) (d32ffb0)
• split: Use correct Kconfig for bumping TX buffers for discovery (#3216) (9490391), closes #3156
• studio: Allow setting UART RPC thread priority (#3290) (e4fb39d)
• studio: avoid decoding buffer overflow (#3185) (70ab6b2)
• studio: Correct memset usage. (c06fa48)
• studio: Correct usage of thread analyzer API (c06fa48)
• studio: Properly serialize GATT RPC indications. (c06fa48)
• tests: Fix BLE test to account for Zephyr changes (c06fa48)
• underglow: Remove use of removed Kconfig WS2812 symbol (c06fa48)
• usb: Adjust Kconfig settings for USB. (c06fa48)
• usb: Prevent unexpected USB disconnection caused by USB SOF (#3070) (118359c)

Documentation

• Added documentation note on locking layers (5138c6f)

Code Refactoring

• core: Allow layer behaviors to "lock" layers on (feat: Allow layer behaviors to "lock" layers on #2717) (5138c6f)

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