Merge remote-tracking branch 'origin/master' into develop

Fix boardsource/lulu RGB matrix (#18407)

* Fix ordering of entries for RGB matrix.

* Fix typos in RGB matrix definition.

These matrix indices overlapped.

* Improve positions in RGB matrix.

The rotary encoder and the key below that are in a new column.
The rotary encoder's height is inbetween rows.
The key below is kind of off-axis and thus hard to pin down to a
specific location.

The modifer keys in the bottom row are staggered compared to the other
columns.

Add DD mapping for LED/RGB Matrix HSVS steps (#18414)

Merge remote-tracking branch 'origin/master' into develop

Fix int8_t overflow in RGB heatmap effect (#18410)

Update pico-sdk to version 1.4.0 (#18423)

...which contains fixes for GCC warnings.

Merge remote-tracking branch 'origin/master' into develop

Enable more BDN9 RGB effects (#18420)

Merge remote-tracking branch 'origin/master' into develop

[Keyboard] Sodium50 - Fix configuration (#18422)

[Core] remove busy waiting from rgblight functions (#18418)

Merge remote-tracking branch 'origin/master' into develop

[Docs] Extract 'Layer Change Code' and EEPROM (#18174)

* [Docs] Extract 'Layer Change Code' and EEPROM

* adjust wording

* Update docs/custom_quantum_functions.md

Co-authored-by: Joel Challis <git@zvecr.com>

Co-authored-by: Joel Challis <git@zvecr.com>

Tidy up LAYOUT macro generation (#18262)

Merge remote-tracking branch 'origin/master' into develop

Add home row modifiers to dshields keymaps. (#18376)

Merge remote-tracking branch 'origin/master' into develop

Reduce charue/sunsetter_r2 firmware size (#18378)

* Reduce charue/sunsetter_r2 firmware size

* add rules.mk

Merge remote-tracking branch 'origin/master' into develop

Add encoder map to BDN9 VIA keymap (#18388)