feat(charts): drop the explanatory line under day-linked charts

src/components/charts/__tests__/health-chart-day-links.test.tsx

@@ -52,11 +52,10 @@ describe("<HealthChart> day links", () => {
     vi.resetModules();
   });
 
-  it("a metric page's chart opens its days: plot, caption and table", async () => {
+  it("a metric page's chart opens its days: plot and table", async () => {
     const html = await renderChart({ dayLinks: true, showDataTable: true });
     expect(html).toContain('data-day-links="true"');
-    expect(html).toContain('data-slot="chart-day-caption"');
-    expect(html).toContain("Click a point to open its day.");
+    expect(html).not.toContain('data-slot="chart-day-caption"');
     const links = html.match(/data-slot="day-link"/g) ?? [];
     expect(links).toHaveLength(10);
     expect(html).toMatch(/href="[^"]*\?day=\d{4}-\d{2}-\d{2}"/);

src/components/charts/compliance-heatmap.tsx

@@ -1,6 +1,5 @@
 "use client";
 
-import { ChartDayCaption } from "@/components/day/chart-day";
 import { dayAnchor } from "@/components/day/chart-day-links";
 import { OPEN_DAY_CELL, useHeatmapDay } from "@/components/day/heatmap-day";
 import { useCalendarDate } from "@/hooks/use-calendar-date";
@@ -368,7 +367,6 @@ export function ComplianceHeatmap({
       </div>
       {activeCells.length > 0 ? (
         <>
-          <ChartDayCaption coarse={heatmapDay.coarse} mark="cell" rug={false} />
           {/* The keyboard and screen-reader way to each active day's doses,
               and to the day itself. */}
           <ChartDataTable

src/components/charts/mood-heatmap.tsx

@@ -1,6 +1,5 @@
 "use client";
 
-import { ChartDayCaption, useCoarsePointer } from "@/components/day/chart-day";
 import { dayAnchor } from "@/components/day/chart-day-links";
 import { OPEN_DAY_CELL, useHeatmapDay } from "@/components/day/heatmap-day";
 import { useCalendarDate } from "@/hooks/use-calendar-date";
@@ -102,14 +101,13 @@ export function MoodHeatmapBody({
 /**
  * The loading shape of the stretched heatmap, at exactly the height the
  * painted heatmap takes: the reserved grid box, the legend line, the day
- * caption and the data-table toggle. `days` is the window when it is already
+ * data-table toggle. `days` is the window when it is already
  * known; without it the shape assumes a window short enough to reach the cell
  * ceiling on every width down to 360 px (eight weeks), the height most
  * calendars settle at.
  */
 export function MoodHeatmapSkeleton({ days = 56 }: { days?: number }) {
   const timeZone = useDisplayTimezone();
-  const coarse = useCoarsePointer();
   return (
     <div
       data-slot="mood-heatmap-skeleton"
@@ -120,7 +118,6 @@ export function MoodHeatmapSkeleton({ days = 56 }: { days?: number }) {
         <div className="bg-muted/50 h-full w-full animate-pulse rounded-md motion-reduce:animate-none" />
       </MoodHeatmapBody>
       <div className="mt-2 h-4" />
-      <ChartDayCaption coarse={coarse} mark="cell" rug={false} />
       <div className="border-border mt-3 border-t pt-3">
         <div className="min-h-11" />
       </div>
@@ -411,7 +408,6 @@ export function MoodHeatmap({
       </div>
       {loggedCells.length > 0 ? (
         <>
-          <ChartDayCaption coarse={heatmapDay.coarse} mark="cell" rug={false} />
           {/* The keyboard and screen-reader way to each logged day's value,
               and to the day itself. */}
           <ChartDataTable

src/components/charts/nutrient-daily-bar-chart.tsx

@@ -173,7 +173,6 @@ export function NutrientDailyBarChart({
         links={chartDays}
         points={points.map((p) => ({ timestamp: dayAnchor(p.day) }))}
         axis="band"
-        mark="bar"
         // The y axis (44) on the left, the margin (12) on the right.
         insetLeft={44}
         insetRight={12}

src/components/day/chart-day-links.tsx

@@ -6,12 +6,10 @@ import type { DateKey } from "@/lib/day/contract";
 import { prefersReducedMotion } from "@/lib/charts/reduced-motion";
 
 import {
-  ChartDayCaption,
   DayRug,
   TooltipDayAction,
   useCoarsePointer,
   type ChartDayAxis,
-  type ChartDayMark,
 } from "./chart-day";
 import { openDay, useOpenDay, type DayFocus } from "./day-layer-controller";
 import { isOpenableDay } from "./day-url";
@@ -35,7 +33,7 @@ import { useTodayKey } from "./use-today-key";
  *     days by accident;
  *   - the open day is marked with `OPEN_DAY_LINE` (a dashed vertical line)
  *     at `openIndex`;
- *   - `ChartDayFooter` draws the row of day dots and the one-line caption.
+ *   - `ChartDayFooter` draws the row of day dots.
  *
  * The caller says, per drawn point and in data order, which calendar day the
  * point stands for, or `null` when it stands for none (a week or month
@@ -190,7 +188,7 @@ export function useChartDayLinks({
 }
 
 /**
- * The row of day dots and the caption under a day-linked chart. Nothing when
+ * The row of day dots under a day-linked chart. Nothing when
  * the chart is not day-linked or draws no points.
  */
 export function ChartDayFooter({
@@ -199,7 +197,6 @@ export function ChartDayFooter({
   axis = "index",
   insetLeft,
   insetRight,
-  mark = "point",
 }: {
   links: Pick<ChartDayLinks, "active" | "coarse"> &
     Partial<Pick<ChartDayLinks, "days">>;
@@ -208,20 +205,16 @@ export function ChartDayFooter({
   axis?: ChartDayAxis;
   insetLeft: number;
   insetRight: number;
-  mark?: ChartDayMark;
 }) {
   if (!links.active || points.length === 0) return null;
   return (
-    <>
-      <DayRug
-        points={points}
-        pointDays={links.days}
-        axis={axis}
-        insetLeft={insetLeft}
-        insetRight={insetRight}
-      />
-      <ChartDayCaption coarse={links.coarse} mark={mark} />
-    </>
+    <DayRug
+      points={points}
+      pointDays={links.days}
+      axis={axis}
+      insetLeft={insetLeft}
+      insetRight={insetRight}
+    />
   );
 }
 

src/components/day/chart-day.tsx

@@ -257,41 +257,3 @@ export function DayRug({
     </div>
   );
 }
-
-/**
- * What a day-linked surface is made of, which names the thing to click in
- * the caption: a point on a line, a bar, or a cell of a calendar.
- */
-export type ChartDayMark = "point" | "bar" | "cell";
-
-const HINT_KEYS: Record<ChartDayMark, { fine: string; coarse: string }> = {
-  point: { fine: "day.chartHint", coarse: "day.chartHintTouch" },
-  bar: { fine: "day.chartHintBar", coarse: "day.chartHintTouchBar" },
-  cell: { fine: "day.chartHintCell", coarse: "day.chartHintTouchCell" },
-};
-
-/**
- * The one line under a day-linked chart: what the dots mean (when the chart
- * has the row of dots), and the click.
- */
-export function ChartDayCaption({
-  coarse,
-  mark = "point",
-  rug = true,
-}: {
-  coarse: boolean;
-  mark?: ChartDayMark;
-  rug?: boolean;
-}) {
-  const { t } = useTranslations();
-  const hint = HINT_KEYS[mark];
-  return (
-    <p
-      data-slot="chart-day-caption"
-      className="text-muted-foreground mt-1 flex flex-wrap justify-between gap-x-4 gap-y-1 text-xs"
-    >
-      {rug ? <span>{t("day.rugLegend")}</span> : null}
-      <span>{coarse ? t(hint.coarse) : t(hint.fine)}</span>
-    </p>
-  );
-}

src/components/insights/sleep-stage-stacked-bar.tsx

@@ -606,7 +606,6 @@ export function SleepStageStackedBar({ breakdown }: SleepStageStackedBarProps) {
                     : 0,
               }))}
               axis="band"
-              mark="bar"
               // The plot's margin (8) + the y axis (60) on the left, the
               // margin (16) on the right.
               insetLeft={8 + 60}