Log training sessions onto the selected day, not always today

The Log button stamps the selected day at the current time of day, so a
forgotten session can be back-filled from that day's view. The snackbar
says which day it landed on when it isn't today; Undo/Add note still
work on it.

src/app.js

@@ -1711,8 +1711,19 @@
       logBtn.textContent = "Log";
       logBtn.addEventListener("click", (e) => {
         e.stopPropagation();
-        const ev = addEvent("training", "", Date.now(), { exerciseId: ex.id });
-        showSnackbar(`${ex.name} logged`, ev);
+        // Log onto the selected day (at the current time of day), so a session
+        // that was forgotten yesterday can be back-filled from that day's view.
+        const day = selectedDay();
+        const onToday = ymd(day) === ymd(new Date());
+        let at = Date.now();
+        if (!onToday) {
+          const now = new Date();
+          at = new Date(day.getFullYear(), day.getMonth(), day.getDate(),
+                        now.getHours(), now.getMinutes(), now.getSeconds()).getTime();
+        }
+        const ev = addEvent("training", "", at, { exerciseId: ex.id });
+        const dayStr = day.toLocaleDateString(undefined, { month: "short", day: "numeric" });
+        showSnackbar(onToday ? `${ex.name} logged` : `${ex.name} logged for ${dayStr}`, ev);
       });
 
       row.appendChild(main);

src/changelog.json

@@ -1,4 +1,6 @@
 [
+  { "date": "2026-07-15", "text": "Logging a training session while viewing another day puts it on that day (the snackbar tells you where it went)" },
+  { "date": "2026-07-15", "text": "The Sleep trend yesterday line is orange instead of gray, which was hard to see" },
   { "date": "2026-07-15", "text": "The Sleep trend average line is teal now, so it doesn't blend in with today's blue line and its projection" },
   { "date": "2026-07-15", "text": "Tapping a day in a chart selects it without jumping down to the history" },
   { "date": "2026-07-15", "text": "Meals with an amount logged show their grams in the day's history" },

src/style.css

@@ -927,11 +927,11 @@ input.switch:checked::after { transform: translateX(18px); }
   fill: none;
 }
 .chart-svg .trend-yesterday {
-  stroke: var(--muted);
+  stroke: var(--eat); /* orange — the gray it had before sank into the grid */
   stroke-width: 1.5;
   stroke-linejoin: round;
   fill: none;
-  opacity: 0.75;
+  opacity: 0.85;
 }
 .chart-svg .trend-avg {
   stroke: var(--weight); /* teal — keeps it apart from today's blue and its blue projected tail */
@@ -954,7 +954,7 @@ input.switch:checked::after { transform: translateX(18px); }
 }
 .lg.trend-today .sw { background: var(--sleep); }
 .lg.trend-projected .sw { background: color-mix(in srgb, var(--sleep) 40%, var(--surface)); }
-.lg.trend-yesterday .sw { background: var(--muted); }
+.lg.trend-yesterday .sw { background: var(--eat); }
 .lg.trend-avg .sw { background: var(--weight); }
 .lg[hidden] { display: none; }