Allow the user to select one tone for the additive DAC (#21591)

Previously, if the user tried to use `#define AUDIO_MAX_SIMULTANEOUS_TONES 1` to conserve CPU time, their firmware would fail to build with this error:

```
platforms/chibios/drivers/audio_dac_additive.c:91:73: error: excess elements in array initializer [-Werror]
   91 | static float   active_tones_snapshot[AUDIO_MAX_SIMULTANEOUS_TONES] = {0, 0};
      |                                                                          ^
```

This also affected the preset `#define AUDIO_DAC_QUALITY_VERY_HIGH`, which called up only one simultaneous tone at 88200 Hz.

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

Fix VS code live share extension link (#21585)

kinesis: remove stacked split layouts (#21569)

Revert "[Bug] Fix compilation error when Split Watchdog enabled" (#21572)

[Bug] Fix compilation error when Split Watchdog enabled (#21543)

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

[Keyboard] Add EC Theca (#21233)

Co-authored-by: jack <0x6a73@protonmail.com>

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

[Keyboard] Add boardsource/unicorne (#21510)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Cole Smith <smithcole@protonmail.com>

Fix backlight support for some boards (#21554)

backlight: split AVR PWM and timer drivers (#21540)

haptic: naming cleanups (#21551)

Rename `dactyl_manuform` variant `3x5_3` (#21015)

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

Document the right location for indicator functions (#21512)

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

Add Bastion75 PCB to QMK (#21529)

* Add Bastion75 to QMK

* Remove blank layers

* Apply suggestions from code review

Co-authored-by: jack <0x6a73@protonmail.com>

* Update keymaps

---------

Co-authored-by: jack <0x6a73@protonmail.com>

Spruce up `dactyl_lightcycle` and `dactyl_maximus` layouts (#21519)

Amend layout and matrix positions for `dactyl_cc` (#21523)