Add the Broadcast Data dialog and send N1MM's score breakdown

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

docs/unfinished.md

@@ -738,6 +738,29 @@ legend. It has no tooltips, no zoom and no 3-D, all of which N1MM's chart
 control gives it for free. A column label that will not fit under its column is
 turned on its side, and one that will not fit even then is left out.
 
+## Broadcast data
+
+What the Broadcast Data dialog saves but does not send yet, or sends in less
+detail than N1MM:
+
+- **Rotor.** The row is saved. Nothing sends `N1MMRotor` messages, because this
+  program has no rotor control.
+- **Spots.** Only `add` goes out. N1MM also sends `delete` when a spot leaves the
+  bandmap. Spots that expire are not reported.
+- **Score.** The rows, their order, the band and mode labels and the layout
+  follow N1MM's query and writer. The row set and order were checked against the
+  query on `om5m.s3db` for 62 contests. Points and multiplier flags come from our
+  own scoring, so they carry the differences listed in `n1mm-interop.md`. The
+  multiplier types come from a table of N1MM's names (`N1mmMultiplierNames`)
+  for the built-in contests; a user-defined contest uses the names its rules
+  give. N1MM writes text values unescaped and we escape them. The bands' wavelength
+  labels were read from N1MM's code and not compared with its output.
+- **Radio.** `RadioName`, `Antenna`, `Rotors`, `FocusEntry`, `EntryWindowHwnd`
+  and the aux antenna fields are sent as 0 or empty, and `IsTransmitting` is
+  always `False`.
+- **Contacts, All Computers.** Only logged contacts are passed on, not edits or
+  deletes.
+
 ## Known rough edges
 
 **The band plan covers 160M to 2M only.** 60M and everything above 2M get no