fix(targets): tighten card gap to eliminate dead space below the header

Override the Card primitive's default gap-4 md:gap-6 with gap-3
md:gap-4 and drop the CardHeader's pb-3 to pb-0. The default
spacing stacked on top of the CardHeader padding rendered a ~36 px
dead gap between the metric label and the headline number on md+,
so the card visually split into two disconnected blocks. The
tighter rhythm pulls the value back under the label so the card
reads as one cohesive unit.

src/components/targets/target-card.tsx

@@ -413,9 +413,15 @@ export function TargetCard({
       data-slot="target-card"
       data-target-type={target.type}
       data-status={statusGroup}
-      className="flex h-full flex-col"
+      // v1.4.37 W4a item 3 — override the Card primitive's default
+      // `gap-4 md:gap-6` to `gap-3 md:gap-4`. The default gap stacked
+      // on top of the CardHeader's `pb-3` rendered a ~36 px dead
+      // space between "Blutdruck optimal" and the headline number;
+      // the tighter rhythm pulls the value back under the label so
+      // the card reads as one unit instead of two separated blocks.
+      className="flex h-full flex-col gap-3 md:gap-4"
     >
-      <CardHeader className="gap-2 pb-3 sm:gap-3">
+      <CardHeader className="gap-2 pb-0 sm:gap-3">
         {/* Row 1: icon + label (left) ⋯ status pill + edit-cog (right
             on sm+, stacked on mobile). Stacking on mobile keeps the
             headline number visible at sub-380px viewports where an