feat: open the day from every chart drawn in days

Move the chart's doors to the day (click, the touch tooltip's button, the
dashed line through the open day, the row of day dots, the caption) into
one hook and give it to every chart with a date axis: recovery, sleep
duration and stages, the mood line and calendar, the intake calendar,
water and caffeine, lab markers, custom metrics, questionnaires and basal
temperature. Heatmaps share one adapter; every chart's keyboard way to a
day is its data table or the dated list beside it.

src/app/insights/mood/page.tsx

@@ -148,7 +148,7 @@ export default function InsightsStimmungPage() {
           MeasurementType series, so the period-over-period range read
           (`/api/analytics/range`, keyed on a MeasurementType enum) has
           nothing to aggregate. */}
-      <MoodChart chartKey="mood" compareBaseline={compareBaseline} />
+      <MoodChart chartKey="mood" compareBaseline={compareBaseline} dayLinks />
 
       <MetricTargetSummary slug="mood" />