fix(dashboard): paired-metric tiles drop to text-2xl so 131/85 stays visible (v1.4.49.4)

Marc reported the BD (Sys) tile rendering `13… mmHg` — the
systolic / diastolic pair `131/85` outgrew the `text-3xl` footprint on
the narrowest grid columns and the value-row's `truncate` ellipsis
chopped the most important part of the tile (the number itself).

The other tiles in the strip (weight, pulse, glucose, …) carry a
single value that never threatens the column-width budget on its own,
so they keep `text-3xl`. Only paired-metric tiles step down to
`text-2xl`; `131/85 mmHg` at `text-2xl tabular-nums tracking-tight` is
~84 px wide vs ~140 px for the narrowest 2-column grid cell — fits
with the unit and trend arrow at every viewport. `truncate` stays as
a defence-in-depth safety net for outlier values.

`cn()` arg ordering tightened so `tailwind-merge` keeps the explicit
`leading-none`. Tailwind v4's `text-3xl` / `text-2xl` carry their own
default `line-height`, and the last-wins dedup rule otherwise dropped
`leading-none` and broke the W20a across-tile baseline alignment that
`trend-card-baseline-alignment.test.tsx` pins.

Also fixes a pre-existing date-boundary test flake:
`src/app/api/medications/intake/__tests__/route.test.ts`'s
`reads the rollup tier when coverage is present` computed `todayKey`
from UTC components, but the route's `readMedicationCompliance` uses
the user's timezone (Europe/Berlin in the test fixture). At every
22:00 — 24:00 UTC window — once the Berlin clock crossed midnight —
the two computations diverged by one calendar day, the mock returned
data for the wrong day, and `today.scheduled` came back zero instead
of three. The test now derives `todayKey` from the same Berlin zone
the route uses.

Tests: 5270 unit + integration pass, lint clean, typecheck clean.

src/components/charts/trend-card.tsx

@@ -268,7 +268,29 @@ export function TrendCard({
         className="mt-2 flex min-w-0 items-baseline gap-x-1.5"
         data-slot="trend-card-value-row"
       >
-        <span className="min-w-0 truncate text-3xl leading-none font-semibold tracking-tight tabular-nums">
+        <span
+          className={cn(
+            "min-w-0 truncate font-semibold tracking-tight tabular-nums",
+            // v1.4.49.4 — paired values (BP systolic/diastolic) render
+            // as `131/85` and outgrow the `text-3xl` footprint on the
+            // narrowest grid columns, ellipsis-clipping to "13…" on the
+            // dashboard. The truncate stays as a defence-in-depth safety
+            // net, but paired tiles drop one font step (text-3xl →
+            // text-2xl) so the full pair stays visible at every column
+            // width. Single-value tiles (weight, pulse, glucose, …)
+            // keep text-3xl because their value never threatens the
+            // budget on its own.
+            secondary ? "text-2xl" : "text-3xl",
+            // `leading-none` must come AFTER the font-size class in the
+            // cn() arg list. Tailwind v4 `text-3xl` / `text-2xl` ship
+            // their own default `line-height`, so `twMerge` would
+            // otherwise drop the explicit `leading-none` per the
+            // last-wins rule and break the W20a across-tile baseline
+            // alignment (digits line up at the same y-coordinate
+            // across every tile in the strip).
+            "leading-none",
+          )}
+        >
           {latest !== null ? renderPair(latest, secondary?.latest) : "—"}
         </span>
         <span className="text-muted-foreground shrink-0 text-sm tabular-nums">