Make the run switch a switch, and split the tuning tolerance by mode

Three things you could not see or could not set.

Run and S&P were a label saying which one you were in. They are two buttons
now, the one you are in marked, either one clickable, which is what N1MM has.
Ctrl+? and F1 still work.

The tuning tolerance is one number per mode, as N1MM keeps it: CW, phone and
digital, 300 Hz each, which are its defaults. A phone signal is wide and a CW
one is not, so one number for both was wrong.

The bearing line went blank whenever it could not be worked out, which looks
exactly like a missing feature. It now says which end could not be placed and
what to do — no country file, no position for your own station, or a callsign
the country file does not place. It also gives miles beside the kilometres, as
N1MM does.

While clicking it: a marked button lost its mark under the pointer, because the
theme paints its own background there. The band buttons had the same fault.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/Nonemm.App/Configuration/Settings.cs

@@ -67,9 +67,19 @@ public sealed record Settings
     public bool EsmSendsCorrectedCall { get; init; } = true;
 
     /// How close to a spot the radio has to be for the entry window to say the
-    /// station is there. N1MM asks for the same number, one per mode; this is
-    /// one number for all of them.
-    public int TuningToleranceHertz { get; init; } = 300;
+    /// station is there. N1MM keeps one per mode and defaults each to 300 Hz.
+    public int CwTuningToleranceHertz { get; init; } = 300;
+
+    public int PhoneTuningToleranceHertz { get; init; } = 300;
+
+    public int DigitalTuningToleranceHertz { get; init; } = 300;
+
+    public int TuningToleranceFor(ModeCategory mode) => mode switch
+    {
+        ModeCategory.Phone => PhoneTuningToleranceHertz,
+        ModeCategory.Digital => DigitalTuningToleranceHertz,
+        _ => CwTuningToleranceHertz,
+    };
 
     /// How far `{FREQUP}` and `{FREQDN}` move the radio. N1MM asks for the same
     /// number in its Configurer.