feat(train): a recording follows a route, its turns told (ADR 0030, D45)

The Record sheet offers the routes with a way planned; the recorder's
service follows the one chosen offline (RouteGuide.kt): turns told 50 m
before them (100 m on a bike) after a tone, off the route past 40 m for
10 s a cue with the way back, told again on rejoining, the end told.
The recording file keeps the route and the guidance; the recording
screen shows the next turn or the way back, and swipes to a map of the
route, the track and the position, north or the heading up.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/train/halkyon_train_flutter/test/support/fake_recorder_platform.dart

@@ -29,6 +29,7 @@ class FakeRecorderPlatform({
           String? rower,
           String? loop,
           Map<String, Object?>? plan,
+          Map<String, Object?>? route,
         })
       >[];
 
@@ -82,6 +83,7 @@ class FakeRecorderPlatform({
     String? rower,
     String? loop,
     Map<String, Object?>? plan,
+    Map<String, Object?>? route,
   }) async {
     started.add((
       path: path,
@@ -91,6 +93,7 @@ class FakeRecorderPlatform({
       rower: rower,
       loop: loop,
       plan: plan,
+      route: route,
     ));
     notices.add(notice);
     _file = File(path)