frontend: COSS checkbox/table + fewer toolbar/sheet buttons

- Invoice dialog: the Back-date / Due-date toggles now use the COSS Checkbox
  instead of raw, misshapen native checkboxes.
- Patients page: rebuilt the list as a COSS Table in a CardFrame, and moved
  "Import from a patient app" into a ⋯ overflow menu so the toolbar keeps one
  primary "Add patient" CTA.
- Patient detail sheet: collapsed the five header buttons + delete into a
  primary Edit action plus a ⋯ More menu (Download summary, Record visit,
  Transfer, Push to wallet, and a destructive Delete).
- Added the COSS table + checkbox primitives; new i18n keys across all locales.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/lib/i18n/locales/ar/translation.json

@@ -377,7 +377,8 @@
       "failedBody": "يرجى المحاولة مرة أخرى."
     },
     "filterStatus": "تصفية حسب الحالة",
-    "allStatuses": "كل الحالات"
+    "allStatuses": "كل الحالات",
+    "moreActions": "إجراءات إضافية"
   },
   "appointments": {
     "title": "المواعيد والجدول",
@@ -1555,7 +1556,8 @@
       "mild": "خفيف",
       "moderate": "متوسط",
       "severe": "شديد"
-    }
+    },
+    "moreActions": "إجراءات إضافية"
   },
   "patientForm": {
     "editTitle": "تعديل السجل",

frontend/lib/i18n/locales/de/translation.json

@@ -365,7 +365,8 @@
       "failedBody": "Bitte versuchen Sie es erneut."
     },
     "filterStatus": "Nach Status filtern",
-    "allStatuses": "Alle Status"
+    "allStatuses": "Alle Status",
+    "moreActions": "Weitere Aktionen"
   },
   "appointments": {
     "title": "Termine & Zeitplan",
@@ -1535,7 +1536,8 @@
       "mild": "Leicht",
       "moderate": "Mäßig",
       "severe": "Schwer"
-    }
+    },
+    "moreActions": "Weitere Aktionen"
   },
   "patientForm": {
     "editTitle": "Datensatz bearbeiten",

frontend/lib/i18n/locales/en/translation.json

@@ -365,7 +365,8 @@
       "failedBody": "Please try again."
     },
     "filterStatus": "Filter by status",
-    "allStatuses": "All statuses"
+    "allStatuses": "All statuses",
+    "moreActions": "More actions"
   },
   "appointments": {
     "title": "Appointments & Schedule",
@@ -1535,7 +1536,8 @@
       "mild": "Mild",
       "moderate": "Moderate",
       "severe": "Severe"
-    }
+    },
+    "moreActions": "More actions"
   },
   "patientForm": {
     "editTitle": "Edit record",

frontend/lib/i18n/locales/fr/translation.json

@@ -365,7 +365,8 @@
       "failedBody": "Veuillez réessayer."
     },
     "filterStatus": "Filtrer par statut",
-    "allStatuses": "Tous les statuts"
+    "allStatuses": "Tous les statuts",
+    "moreActions": "Plus d’actions"
   },
   "appointments": {
     "title": "Rendez-vous & Planning",
@@ -1535,7 +1536,8 @@
       "mild": "Légère",
       "moderate": "Modérée",
       "severe": "Sévère"
-    }
+    },
+    "moreActions": "Plus d’actions"
   },
   "patientForm": {
     "editTitle": "Modifier le dossier",

frontend/lib/i18n/locales/so/translation.json

@@ -365,7 +365,8 @@
       "failedBody": "Fadlan isku day mar kale."
     },
     "filterStatus": "Ku kala sooc xaaladda",
-    "allStatuses": "Dhammaan xaaladaha"
+    "allStatuses": "Dhammaan xaaladaha",
+    "moreActions": "Ficillo dheeraad ah"
   },
   "appointments": {
     "title": "Ballamaha & Jadwalka",
@@ -1535,7 +1536,8 @@
       "mild": "Fudud",
       "moderate": "Dhexdhexaad",
       "severe": "Daran"
-    }
+    },
+    "moreActions": "Ficillo dheeraad ah"
   },
   "patientForm": {
     "editTitle": "Wax ka beddel diiwaanka",