feat(routes): add realtime estimates panel with pattern-aware styling

- New GET /api/stops/estimates endpoint (nano mode: tripId, patternId, estimate, delay only)
- useStopEstimates hook wiring estimates to routes-$id stop panel
- Pattern-aware styling: dim schedules and estimates from other patterns
- Past scheduled departures shown with strikethrough instead of hidden
- Persist selected pattern in URL hash (replace navigation, no history push)
- Fix planner arrivals using new estimates endpoint

1 files changed, 6 insertions, 0 deletions

diff --git a/src/Enmarcha.Backend/Services/ArrivalsPipeline.cs b/src/Enmarcha.Backend/Services/ArrivalsPipeline.cs
index 6d8c2c0..9e44535 100644
--- a/src/Enmarcha.Backend/Services/ArrivalsPipeline.cs
+++ b/src/Enmarcha.Backend/Services/ArrivalsPipeline.cs
@@ -20,6 +20,12 @@ public class ArrivalsContext
     /// </summary>
     public bool IsReduced { get; set; }
 
+    /// <summary>
+    /// Nano mode: skip all enrichment except real-time estimates.
+    /// Processors that populate shapes, marquee, next stops, and usage should no-op when true.
+    /// </summary>
+    public bool IsNano { get; set; }
+
     public Position? StopLocation { get; set; }
 
     public required List<Arrival> Arrivals { get; set; }