Add a Wi-Fi band toggle to the network panel (#6437)

Pins the active connection to 2.4/5/6GHz, or leaves the choice automatic.
The section only appears on Wi-Fi when the network answers on more than one
band, or while a pin is in force so it stays clearable.

bin/omarchy-network-band reports and sets the band. It sets NetworkManager's
802-11-wireless.band rather than pinning a BSSID: NM 1.44+ accepts a third
band value so 5 and 6GHz can be pinned apart, and a band survives an AP
rotating its BSSIDs while leaving roaming between APs intact. It refuses a
band the network does not answer on, and restores the previous setting if
reassociation fails rather than leaving the machine offline.

Under Automatic the pills collapse and the header reads the live band
("WI-FI BAND: 2.4GHZ"); pinning reveals them and the header goes plain. The
height is animated, and the section stays mounted through the reconnect a
band change causes -- otherwise `kind` briefly stops being "wifi" and the
whole segment would tear down and rebuild.

Two fixes to the same panel fall out of this:

- Every stat row stays mounted and reads "--" until it has data, instead of
  appearing a beat after the panel opens and shoving the rows below down.
- The speed test's Run button is scaled to match the band header's controls
  and joins the keyboard cursor chain.

ToggleSwitch gains a settable trackHeight so a compact placement can render a
genuinely small switch instead of scaling one down onto fractional pixels.
Defaults are unchanged.


Claude-Session: https://claude.ai/code/session_01XcKqYe1n5bnRBuAZwikwsr

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

shell/Ui/ToggleSwitch.qml

@@ -48,10 +48,17 @@ Item {
 
   readonly property alias containsMouse: mouse.containsMouse
   readonly property bool hot: hasCursor || mouse.containsMouse
-  readonly property int trackHeight: Math.max(22, Math.round(Style.spacing.controlHeight * 0.55))
-  readonly property int trackWidth: Math.max(42, Math.round(trackHeight * 1.9))
-  readonly property int knobSize: Math.max(16, Math.round(trackHeight * 0.72))
-  readonly property int knobInset: Math.max(2, Math.round((trackHeight - knobSize) / 2))
+
+  // `trackHeight` is settable so a compact placement — a switch riding a panel
+  // section header, say — can ask for a genuinely smaller control instead of
+  // scaling a big one down, which lands the track and knob on fractional pixels
+  // and blurs their edges. The derived sizes only carry floors low enough to
+  // stay out of an override's way; at the default track height each one is
+  // already above its floor, so nothing about the normal switch changes.
+  property int trackHeight: Math.max(22, Math.round(Style.spacing.controlHeight * 0.55))
+  property int trackWidth: Math.round(trackHeight * 1.9)
+  property int knobSize: Math.max(6, Math.round(trackHeight * 0.72))
+  property int knobInset: Math.max(1, Math.round((trackHeight - knobSize) / 2))
 
   readonly property int _pad: cursorRing ? cursorPad : 0