Move the files into N1MM's own folder

The root is Documents/N1MM Logger+ now, so a station that runs both programs
has one set of files rather than two: one Databases folder, one SupportFiles,
one Wav with a folder per operator in it. What N1MM has no place for goes in a
Nonemm folder inside it, which is where settings.json sits.

A system that does not say where Documents is — most Linux systems — gets
~/Documents/N1MM Logger+.

Files an older version kept in Documents\Nonemm or ~/.config/nonemm are copied
in the first time this version runs, and the log and call history paths in the
settings are moved with them, so the copy that opens is the copy that came
over. The older folder is left as it was.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RoGtneMQaz4M9w7Kk49AVD

src/Nonemm.App/App.axaml.cs

@@ -18,6 +18,7 @@ public partial class App : Application
         {
             UserPaths paths = UserPaths.Default();
             paths.CreateFolders();
+            paths.AdoptOlderFiles();
             Settings settings = Settings.Load(paths.SettingsFile);
             Themes.Use(settings.Theme);
             Themes.Changed += (_, _) => ApplyTheme();