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

lib/widgets/accel_graph.dart

@@ -126,6 +126,7 @@ class _AccelGraphState extends State<AccelGraph> {
                 Text(
                   'Lon: ${_formatAccel(widget.ay)} (${_formatAccel(_ghostAy)})',
                   style: TextStyle(
+                    fontFamily: hudFont,
                     fontSize: fontSize * 0.5,
                     fontWeight: FontWeight.w400,
                     fontFeatures: const [FontFeature.tabularFigures()],
@@ -136,6 +137,7 @@ class _AccelGraphState extends State<AccelGraph> {
                 Text(
                   'Lat: ${_formatAccel(widget.ax)} (${_formatAccel(_ghostAx)})',
                   style: TextStyle(
+                    fontFamily: hudFont,
                     fontSize: fontSize * 0.5,
                     fontWeight: FontWeight.w400,
                     fontFeatures: const [FontFeature.tabularFigures()],
@@ -149,6 +151,7 @@ class _AccelGraphState extends State<AccelGraph> {
             Text(
               'Acceleration',
               style: TextStyle(
+                fontFamily: hudFont,
                 fontSize: fontSize * 0.8,
                 fontWeight: FontWeight.w400,
                 color: theme.subdued,