fix(dashboard): glucose in-range coloring, treatment markers, loop pill units (#422)

Glucose chart "In Range" coloring used the personal target range (Low/High)
for both point colors and the dashed reference lines. A narrow target (e.g.
95-95) collapsed the In Range band onto a single value. Color by a fixed
clinical band (54/70/180/250) instead, independent of the target, and carry
the personal target separately (ChartThresholdsDto.TargetLow/TargetHigh) as
its own reference line.

Carb and bolus markers were positioned at magnitude-dependent heights, so the
two half-circles only combined into a single circle by coincidence. Anchor
both to a shared baseline (IOB/COB track center) so a same-time carb+bolus
always forms one circle; magnitude stays in the labels.

Treatment hemisphere SVGs had their arc sweep flags reversed, so the arcs
bulged outside the icon viewBox: the bolus legend symbol showed as a flat line
and the carbs symbol was clipped away entirely; the chart markers bulged
opposite to their labels. Correct the sweep flag in BolusIcon, CarbsIcon,
BolusMarker and CarbMarker so bolus is a dome (above baseline) and carbs a
bowl (below baseline), consistent across legend and chart.

The Loop pill formatted eventual BG with a local helper defaulting to mmol/L
and was never passed the user's unit preference. Use the shared bg() helper so
it follows the global glucose-unit preference like every other BG display.

Regenerated NSwag client/schemas for the new threshold fields.

Author: ryceg

src/API/Nocturne.API/Services/ChartData/Stages/ProfileLoadStage.cs

@@ -10,9 +10,12 @@ namespace Nocturne.API.Services.ChartData.Stages;
 /// </summary>
 /// <remarks>
 /// <para>
-/// Hard-coded very-low (54 mg/dL) and very-high (250 mg/dL) thresholds are not configurable
-/// per profile; low and high targets are read from the active profile at <see cref="ChartDataContext.EndTime"/>.
-/// When no profile is available the fallback thresholds are 70/180 mg/dL and 1.0 U/hr basal.
+/// The coloring thresholds (very-low 54, low 70, high 180, very-high 250 mg/dL) are a fixed clinical
+/// glycemic band, not the patient's personal target — so a narrow target (e.g. 95-95) does not
+/// collapse the "In Range" band onto a single value. The personal target is read from the active
+/// profile at <see cref="ChartDataContext.EndTime"/> and carried separately as
+/// <see cref="ChartThresholdsDto.TargetLow"/>/<see cref="ChartThresholdsDto.TargetHigh"/> for a
+/// distinct reference line. When no profile is available there is no target and basal defaults to 1.0 U/hr.
 /// </para>
 /// </remarks>
 /// <seealso cref="IChartDataStage"/>
@@ -25,6 +28,8 @@ ILogger<ProfileLoadStage> logger
 ) : IChartDataStage
 {
     private const double DefaultVeryLow = 54;
+    private const double DefaultLow = 70;
+    private const double DefaultHigh = 180;
     private const double DefaultVeryHigh = 250;
 
     public async Task<ChartDataContext> ExecuteAsync(ChartDataContext context, CancellationToken cancellationToken)
@@ -42,9 +47,11 @@ public async Task<ChartDataContext> ExecuteAsync(ChartDataContext context, Cance
             thresholds = new ChartThresholdsDto
             {
                 VeryLow = DefaultVeryLow,
-                Low = await targetRangeResolver.GetLowBGTargetAsync(context.EndTime, ct: cancellationToken),
-                High = await targetRangeResolver.GetHighBGTargetAsync(context.EndTime, ct: cancellationToken),
+                Low = DefaultLow,
+                High = DefaultHigh,
                 VeryHigh = DefaultVeryHigh,
+                TargetLow = await targetRangeResolver.GetLowBGTargetAsync(context.EndTime, ct: cancellationToken),
+                TargetHigh = await targetRangeResolver.GetHighBGTargetAsync(context.EndTime, ct: cancellationToken),
             };
             defaultBasalRate = await basalRateResolver.GetBasalRateAsync(context.EndTime, ct: cancellationToken);
 
@@ -55,8 +62,8 @@ public async Task<ChartDataContext> ExecuteAsync(ChartDataContext context, Cance
             thresholds = new ChartThresholdsDto
             {
                 VeryLow = DefaultVeryLow,
-                Low = 70,
-                High = 180,
+                Low = DefaultLow,
+                High = DefaultHigh,
                 VeryHigh = DefaultVeryHigh,
             };
             defaultBasalRate = 1.0;

src/Core/Nocturne.Core.Models/ChartDataDtos.cs

@@ -106,15 +106,28 @@ public class DashboardChartData
 }
 
 /// <summary>
-/// Glucose threshold configuration derived from the active profile.
+/// Glucose threshold configuration for the dashboard chart.
 /// </summary>
+/// <remarks>
+/// <see cref="Low"/>/<see cref="High"/>/<see cref="VeryLow"/>/<see cref="VeryHigh"/> are the fixed
+/// clinical glycemic band used to color readings (Very Low / Low / In Range / High / Very High) and
+/// draw the in-range reference lines — they are independent of the patient's personal target.
+/// <see cref="TargetLow"/>/<see cref="TargetHigh"/> carry the personal BG target from the active
+/// profile, shown as a separate reference line; null when no profile is available.
+/// </remarks>
 public record ChartThresholdsDto
 {
     public double Low { get; init; }
     public double High { get; init; }
     public double VeryLow { get; init; }
     public double VeryHigh { get; init; }
     public double GlucoseYMax { get; init; }
+
+    /// <summary>Personal BG target lower bound (mg/dL) from the active profile; null when no profile.</summary>
+    public double? TargetLow { get; init; }
+
+    /// <summary>Personal BG target upper bound (mg/dL) from the active profile; null when no profile.</summary>
+    public double? TargetHigh { get; init; }
 }
 
 /// <summary>