refactor: simplify the capture picker without behavior change

Drop the no-op single-argument cn() wrapper on the chooser button
class (and its now-unused import), and replace the three-way nested
ternary that resolves the form-sheet title with an explicit
per-kind lookup map. The null-kind fallback keeps the prior
ternary's mood label, and the sheet stays closed in that state so
the title is never read.

(cherry picked from commit 856e620754753570e0d4ce8d6ce982778e929b75)

src/components/layout/capture-picker.tsx

@@ -7,7 +7,6 @@ import { MeasurementForm } from "@/components/measurements/measurement-form";
 import { MoodForm } from "@/components/mood/mood-form";
 import { MedicationIntakeQuickAdd } from "@/components/dashboard/medication-intake-quick-add";
 import { ResponsiveSheet } from "@/components/ui/responsive-sheet";
-import { cn } from "@/lib/utils";
 import { useTranslations } from "@/lib/i18n/context";
 
 /**
@@ -80,12 +79,15 @@ export function CapturePicker({ open, onOpenChange }: CapturePickerProps) {
     },
   ];
 
-  const formTitle =
-    kind === "measurement"
-      ? t("measurements.addMeasurement")
-      : kind === "medication"
-        ? t("nav.capture.medication")
-        : t("mood.addEntry");
+  const formTitleByKind: Record<CaptureKind, string> = {
+    measurement: t("measurements.addMeasurement"),
+    medication: t("nav.capture.medication"),
+    mood: t("mood.addEntry"),
+  };
+  // `kind === null` keeps the form sheet closed (the title is unread then);
+  // the mood label is the harmless default, matching the prior ternary's
+  // else branch.
+  const formTitle = kind ? formTitleByKind[kind] : t("mood.addEntry");
 
   return (
     <>
@@ -103,9 +105,7 @@ export function CapturePicker({ open, onOpenChange }: CapturePickerProps) {
               type="button"
               data-testid={`capture-picker-${opt.kind}`}
               onClick={() => chooseKind(opt.kind)}
-              className={cn(
-                "border-border hover:bg-accent/40 focus-visible:ring-ring/50 flex min-h-14 items-center gap-3 rounded-lg border px-4 py-3 text-left transition-colors focus-visible:outline-none focus-visible:ring-2",
-              )}
+              className="border-border hover:bg-accent/40 focus-visible:ring-ring/50 flex min-h-14 items-center gap-3 rounded-lg border px-4 py-3 text-left transition-colors focus-visible:outline-none focus-visible:ring-2"
             >
               <span className="bg-primary/10 text-primary flex h-9 w-9 shrink-0 items-center justify-center rounded-full">
                 <opt.icon className="h-5 w-5" aria-hidden="true" />