control centre: Wi-Fi and Bluetooth menus as a map around this desktop

The menus are 820 px wide (the panel resizes to them). This desktop is a bubble in
the middle, networks and devices float around it, nearer the stronger (or the more
connected) they are, rings ripple out while scanning. Each is tied to the bubble by a
line: grey and wobbling while idle, running out from the bubble after a click until
it's connected, solid with a travelling pulse once connected.

The map is one Canvas: node discs and icons are shapes in it (glyph_shapes), the node
widgets only take the pointer. Seven icon Canvas widgets had cost 4.6 ms of gpu a
frame and halved the frame rate; now 1.8 ms at 60 fps. The menu window is sized to
its menu.

README.md

@@ -21,11 +21,11 @@ The pill shows only what runs: Wi-Fi signal while iwd runs (dim while its radio
 The panel has:
 
 - **Four tiles:** Wi-Fi, Bluetooth, VPN, Hotspot. Accent = on; grey with a grey strike through the icon = its service isn't running (iwd, bluetoothd, the openvpn service); grey without the strike = nothing to work with (no device, hotspot not set up). Wi-Fi, Bluetooth and VPN open their menu when clicked anywhere; Hotspot switches at once.
-  - *Wi-Fi* (iwd): iwd stopped → grey; the switch in its menu runs `rc-service iwd start`. iwd running → the switch turns the device (station) on or off. The menu lists the networks in range (connected first, then by signal): click the connected one to disconnect, a saved or open one to join. A new network with a password has to be joined once with `iwctl` (the menu can't ask for passwords yet). "Stop the Wi-Fi service" at the bottom runs `rc-service iwd stop`. The shell never wakes iwd by asking it anything: it checks `NameHasOwner` first, because any D-Bus call to `net.connman.iwd` starts it.
-  - *Bluetooth* (BlueZ, through Amane's `Bluetooth`): the switch powers the adapter; with bluez installed but stopped it runs `rc-service bluetooth start`. The menu scans while it's open and lists the devices: click to connect, disconnect, or pair (pairing works for devices without a PIN).
+  - *Wi-Fi* (iwd): iwd stopped → grey; the switch in its menu runs `rc-service iwd start`. iwd running → the switch turns the device (station) on or off. The menu is a map: this desktop as a bubble in the middle (its hostname under it), every network in range floating around it, nearer the stronger its signal, rings rippling out while iwd scans. Each is tied to the bubble by a line: grey and wobbling while not connected; after a click the line runs out from the bubble to it until it's connected; then solid, with a pulse travelling along it. Click a saved or open network to join it, the connected one to disconnect. A new network with a password has to be joined once with `iwctl` (the map can't ask for passwords yet). "Stop the Wi-Fi service" at the bottom runs `rc-service iwd stop`. The shell never wakes iwd by asking it anything: it checks `NameHasOwner` first, because any D-Bus call to `net.connman.iwd` starts it.
+  - *Bluetooth* (BlueZ, through Amane's `Bluetooth`): the switch powers the adapter; with bluez installed but stopped it runs `rc-service bluetooth start`. The menu is the same map with the devices bluez knows or finds (it scans while open): connected ones closest, then paired, then the rest. Click to connect, disconnect, or pair (pairing works for devices without a PIN).
   - *VPN*: every openrc service `/etc/init.d/openvpn.*` (here `openvpn.swiss`), each with a switch. Connecting while openrc has it *inactive*, connected once its `up.sh` marks it *started*. A switch runs `rc-service openvpn.<name> start|stop`.
   - *Hotspot* (iwd access point): see [Hotspot setup](#hotspot-setup).
-- **Menus:** each opens in a window of its own over the panel and grows out of its tile; the panel takes the menu's size underneath, so the two lie on top of each other. The back button returns to the panel. Moving the pointer off both closes the menu where it is: its content fades out and it shrinks straight into the pill, without the panel growing back first.
+- **Menus:** each opens in a window of its own over the panel and grows out of its tile; the panel takes the menu's size underneath (the Wi-Fi and Bluetooth maps are 820 px wide, more than twice the panel), so the two lie on top of each other. The back button returns to the panel. Moving the pointer off both closes the menu where it is: its content fades out and it shrinks straight into the pill, without the panel growing back first.
 - **Sound:** the default output's volume (drag or scroll the slider); the value next to the title is the mute button. With `extra_output` in `shell.conf` a second slider follows for the output whose name contains it (here `NR515`: the `[TX-NR515]` receiver on HDMI 1). Clicking the block elsewhere opens the Sound menu: every output with its own slider and mute; click a name to make it the default output.
 - **Display:** the laptop screen's brightness and the keyboard light (`tpacpi::kbd_backlight`: Off, Low, High), written straight to their sysfs files (a udev rule makes them writable by everyone on this laptop), else through logind, which refuses a shell without a seat (one started over ssh). For external monitors see [External monitor brightness](#external-monitor-brightness).
 - **Performance:** the firmware profiles in `/sys/firmware/acpi/platform_profile_choices` (Low power, Balanced, Performance), and the battery's state and time left. Picking one sets the platform profile and the CPU governor and energy preference with it: Low power = `powersave` + `power`, Balanced = `powersave` + `balance_performance`, Performance = the `performance` governor.
@@ -116,9 +116,10 @@ src/sound.rs       per-player volume, mute, output and equalizer (pactl, pw-cli,
 src/spectrum.rs    the shown player's sound as 24 levels (pw-record | cava)
 src/art.rs         cover download (curl) and the palette file
 src/workspaces.rs  the workspace pill, top left on every monitor
-src/control.rs     the control centre: status pill top right, its panel, `control` IPC
+src/control.rs     the control centre: status pill top right, its panel and menus, `control` IPC
+src/map.rs         the Wi-Fi and Bluetooth menus' map: this desktop in the middle, what it can connect to around it
 src/system.rs      what the control centre shows: iwd, openvpn, power, the external GPU
-src/glyph.rs       every drawn icon
+src/glyph.rs       every drawn icon, as a Canvas or as shapes for a shared one
 src/theme.rs       the shell's colours: the matugen theme file, shell.conf, the cross-fade
 src/parse.rs       pure text parsing with unit tests, no amane dependency
 matugen/           the matugen template (amane.colors), rendered by skwd-wall into ./theme