Dash: DIN 1451 opt-in per widget (hudFont), GNSS compass, rei by default; widget catalogue

From smart-serow: the DIN 1451 face (Alte DIN 1451 Mittelschrift, via gps-speedo)
and GpsCompass. A cosmetic font is opt-in: widgets name hudFont in their own
TextStyle, the rest keeps the basic font (CJK). Boxes and telltales shrink long
labels instead of wrapping. Telltale and Reading get their own files;
lib/README.md catalogues folders and widgets like smart-serow's.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz

pubspec.yaml

@@ -57,6 +57,12 @@ flutter:
   # the material Icons class.
   uses-material-design: true
 
+  # "Alte DIN 1451 Mittelschrift" (Peter Wiegel), the HUD face of smart-serow and gps-speedo.
+  fonts:
+    - family: DIN1451
+      fonts:
+        - asset: assets/fonts/din1451alt.ttf
+
   # Exact copies of contracts files (tool/sync-contracts.sh); crosscheck verifies them.
   assets:
     - assets/contracts/checklists/