[JB-OD]

Adds three settings to the WH-1000XM4 (v1 protocol): Speak-to-Chat, Connect to 2 devices and Touch Controls. Also turns the macOS app into a menu-bar-only app. Tested on a WH-1000XM4 on firmware 3.0.1, which macOS shows under a custom name.

XM4 protocol findings

These are taken from the headset's own replies and from an iPhone Sound Connect capture, recorded with Apple's Bluetooth logging profile and PacketLogger.

Speak-to-Chat was hidden on the XM4. The headset answers f6 05 with f7 05 00 <on>. It only uses the 01 kind byte (f9 05 01 <on>) in its change notifications. The probe required 01, so the setting never showed. It now accepts both. Gadgetbridge's V1 handler rejects this reply the same way.

Multipoint and touch panel are v1 general settings. They're found by name from the function list, using the layout from baglayan/acouplet#5:

	Request	Reply
Function list	06 00	07 00 <count> … (includes d1, d2)
Name	d0 <slot> 01	d1 <slot> 02 <len>"MULTIPOINT_SETTING" … (or "TOUCH_PANEL_SETTING")
Value	d6 <slot>	d7 <slot> 01 <01 on / 00 off>
Change	d8 <slot> 01 <01/00>

Turning multipoint on or off needs one extra step that isn't documented anywhere I could find. Without 94 01 00, the headset declines the change: it notifies d9 d2 01 01 (unchanged) and asks nothing. Sound Connect sends 94 01 00 once per connection. After it, the headset asks 99 01 07 01 (off) or 99 01 06 01 (on). Answering 98 01 <msg> 01 applies the change, and the headset restarts. This app sends 94 01 00 just before a multipoint change only, so other confirmation prompts that nothing here answers stay off.

All of this is in Headphones.cpp. tests/HeadphonesProtocolTests.cpp replays the captured replies. That includes the fake headset declining the change unless 94 01 00 came first, and a declined change being reported instead of shown as applied.

macOS app

This is the opinionated part; it's your call, and I'm happy to split it out or rework it.

• Menu-bar only: no Dock icon and no window. The storyboard window scenes, ViewController and ContentView are gone, and the pieces the panel shares are now in SharedViews.swift.
  • Top of the panel: mode, ambient level, a draggable EQ graph (bands on a log-frequency axis with dB gridlines), the preset menu and Clear Bass.
  • Behind a footer arrow: settings, devices, appearance, device info and Quit.
• Auto-connect on launch, and whenever a Sony headset connects to the Mac. It never goes through the device picker, and it stays off after a manual disconnect.
• The menu-bar icon hides while no Sony headset is connected to the Mac. Relaunching the app shows it, with the panel.
• Connect to 2 devices asks before restarting the headset, then reconnects once the headset is back.
• Detection: a headset renamed in macOS is found by its Sony control service UUID, not just by name prefix.
• Smaller changes: Native Glass follows the system light/dark setting in the panel; the codec chip is dropped; "Noise Cancelling" uses British spelling.

Testing

• Client/tests/run-macos.sh passes: protocol, golden, metamorphic and connector-buffer tests.
• Release build with Xcode 27: no errors.
• On a WH-1000XM4 (fw 3.0.1):
  • connect without the device picker;
  • Speak-to-Chat shows and reads correctly;
  • Touch Controls toggles;
  • Connect to 2 devices goes off and back on (confirm, restart, auto-reconnect, reads back correctly);
  • auto-connect on launch;
  • icon hiding.
• Not tested: v2 headsets, whose code paths are unchanged apart from the shared panel, and the Windows/Linux builds, which aren't touched.

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