frontend: patient delete + complete sheet + Obsidian-style record graph

- deletePatient() lib fn (DELETE /api/patients/:fileNumber already existed)
- confirmed delete button in the patient sheet (full-clinician only)
- aggregate appointments/prescriptions/invoices into the sheet (by file #)
- new shared RecordGraph (@xyflow/react + d3-force) linking problems↔visits,
  added as a "Record graph" section + reusable by AI Graph mode
- i18n keys for delete + new sheet sections

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

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

@@ -206,6 +206,16 @@
       "successBody": "{{name}} is now with {{provider}}.",
       "errorTitle": "Couldn't transfer patient",
       "error": "Please try again."
+    },
+    "delete": {
+      "action": "Delete patient",
+      "title": "Delete patient?",
+      "body": "Permanently delete {{name}}'s chart and all of its records. This cannot be undone.",
+      "confirm": "Delete patient",
+      "cancel": "Cancel",
+      "doneTitle": "Patient deleted",
+      "failedTitle": "Couldn't delete patient",
+      "failedBody": "Please try again."
     }
   },
   "appointments": {
@@ -1022,6 +1032,23 @@
       "recent": "{{count}} recent",
       "empty": "No visits yet."
     },
+    "graph": {
+      "title": "Record graph",
+      "hint": "How this patient's problems and visits connect. Drag nodes; scroll to pan.",
+      "empty": "Not enough record data to graph yet."
+    },
+    "appointments": {
+      "title": "Appointments",
+      "empty": "No appointments on file."
+    },
+    "prescriptions": {
+      "title": "Prescriptions",
+      "empty": "No prescriptions on file."
+    },
+    "invoices": {
+      "title": "Invoices",
+      "empty": "No invoices on file."
+    },
     "trend": {
       "empty": "No trend data yet.",
       "last": "{{label}} · last {{count}}",

frontend/lib/patients.ts

@@ -130,6 +130,16 @@ export async function appendLabs(
   );
 }
 
+// Permanently delete a patient's chart. Backed by DELETE
+// /api/patients/:fileNumber (gated by `patient:delete` — the full-clinician
+// marker). Resolves on 204; throws ApiError on failure.
+export async function deletePatient(fileNumber: string): Promise<void> {
+  await apiFetch<void>(
+    `/api/patients/${encodeURIComponent(fileNumber.trim())}`,
+    { method: "DELETE" },
+  );
+}
+
 // Reassign a patient to another clinician (sets their primary provider + PCP).
 export async function transferPatient(
   fileNumber: string,