feat(train): Maps shows every route on the map, above the list or beside it (ADR 0030, D60)

The instance's map with every route drawn, fitted to them all, a route
tapped opening its planner. On phones the map stands above the list;
from expanded windows on the two are panes side by side, as Material's
list-detail layout. Without a route to draw, the list alone.

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

docs/adr/0030-halkyon-train.md

@@ -1504,6 +1504,11 @@ Strava. What was found, 27 Oct:
   English, Material's `firstDayOfWeekIndex`), each workout on the day it started, local
   time; over the totals alone and over a chart of several weeks (the developer's,
   31 Oct).
+  Maps shows every route on the instance's map (`RoutesMap`), the camera fitting them,
+  one tapped opening its planner: above the list below expanded windows, beside it from
+  expanded windows on, as Material's list–detail layout has two panes there; without a
+  route to draw, the list alone, as there is nothing to centre on without asking the
+  phone where it is (the developer's, 31 Oct).
 
 ## Consequences