feat(dashboard): add a wrench shortcut to the dashboard settings beside the add button

Place a monochrome ghost wrench icon-button immediately to the left of
the dashboard add button, linking to the layout/tile editor at
/settings/dashboard. The button carries an aria-label and matches the
add button's 44 px mobile touch-target floor, shrinking to the icon
footprint on sm+. New customizeDashboard string lands in all six
locales.

messages/de.json

@@ -275,6 +275,7 @@
     "quickAddMeasurement": "Messung erfassen",
     "quickAddMood": "Stimmung erfassen",
     "quickAddMedicationIntake": "Einnahme erfassen",
+    "customizeDashboard": "Dashboard anpassen",
     "medicationIntakeQuickAdd": {
       "sheetTitle": "Medikamenteneinnahme erfassen",
       "sheetDescription": "Dosis, Zeitpunkt und Medikament in wenigen Tipps protokollieren.",

messages/en.json

@@ -275,6 +275,7 @@
     "quickAddMeasurement": "Log measurement",
     "quickAddMood": "Log mood",
     "quickAddMedicationIntake": "Log medication intake",
+    "customizeDashboard": "Customize dashboard",
     "medicationIntakeQuickAdd": {
       "sheetTitle": "Log medication intake",
       "sheetDescription": "Record dose, time, and medication in a few taps.",

messages/es.json

@@ -275,6 +275,7 @@
     "quickAddMeasurement": "Registrar medición",
     "quickAddMood": "Registrar estado de ánimo",
     "quickAddMedicationIntake": "Registrar toma",
+    "customizeDashboard": "Personalizar panel",
     "medicationIntakeQuickAdd": {
       "sheetTitle": "Registrar toma de medicación",
       "sheetDescription": "Registra dosis, hora y medicamento en unos pocos toques.",

messages/fr.json

@@ -275,6 +275,7 @@
     "quickAddMeasurement": "Saisir une mesure",
     "quickAddMood": "Saisir une humeur",
     "quickAddMedicationIntake": "Saisir une prise",
+    "customizeDashboard": "Personnaliser le tableau de bord",
     "medicationIntakeQuickAdd": {
       "sheetTitle": "Saisir une prise de médicament",
       "sheetDescription": "Enregistre la dose, l’heure et le médicament en quelques touches.",

messages/it.json

@@ -275,6 +275,7 @@
     "quickAddMeasurement": "Registra misurazione",
     "quickAddMood": "Registra umore",
     "quickAddMedicationIntake": "Registra assunzione",
+    "customizeDashboard": "Personalizza dashboard",
     "medicationIntakeQuickAdd": {
       "sheetTitle": "Registra assunzione del farmaco",
       "sheetDescription": "Registra dose, orario e farmaco con pochi tap.",

messages/pl.json

@@ -275,6 +275,7 @@
     "quickAddMeasurement": "Zarejestruj pomiar",
     "quickAddMood": "Zarejestruj nastrój",
     "quickAddMedicationIntake": "Zarejestruj przyjęcie",
+    "customizeDashboard": "Dostosuj pulpit",
     "medicationIntakeQuickAdd": {
       "sheetTitle": "Zarejestruj przyjęcie leku",
       "sheetDescription": "Zapisz dawkę, godzinę i lek w kilku stuknięciach.",

src/app/page.tsx

@@ -17,6 +17,7 @@ import {
   Target,
   TrendingUp,
   Waves,
+  Wrench,
 } from "lucide-react";
 import { convertGlucose, resolveGlucoseUnit } from "@/lib/glucose";
 import { cn } from "@/lib/utils";
@@ -27,6 +28,7 @@ import {
 } from "@/lib/dashboard-layout";
 import type { DashboardAnalyticsData as AnalyticsData } from "@/types/analytics";
 import dynamic from "next/dynamic";
+import Link from "next/link";
 import { Button } from "@/components/ui/button";
 import { EmptyState } from "@/components/ui/empty-state";
 import { ChartSkeleton } from "@/components/charts/chart-skeleton";
@@ -809,6 +811,27 @@ export default function DashboardPage() {
           <p className="text-muted-foreground mt-1 text-sm">{welcomeText}</p>
         </div>
         <div className="flex items-center gap-2">
+          {/* Wrench shortcut to the dashboard-customization settings
+              (the tile/layout editor at /settings/dashboard). Sits to
+              the left of the add button as a monochrome ghost icon, with
+              a `min-h-11 min-w-11` mobile floor so it meets the 44 px
+              touch-target contract the add button also honours, shrinking
+              back to the 40 px icon footprint on sm+. */}
+          <Button
+            asChild
+            variant="ghost"
+            size="icon"
+            className="min-h-11 min-w-11 sm:min-h-9 sm:min-w-9"
+            data-testid="dashboard-customize-shortcut"
+          >
+            <Link
+              href="/settings/dashboard"
+              aria-label={t("dashboard.customizeDashboard")}
+              title={t("dashboard.customizeDashboard")}
+            >
+              <Wrench className="h-4 w-4" aria-hidden="true" />
+            </Link>
+          </Button>
           <DropdownMenu>
             <DropdownMenuTrigger asChild>
               {/* v1.4.33 maintainer-item-7 — restore proportional sizing