fix(a11y): label per-reminder toggles and wire disclosure controls

The diabetes PATCH parsed its body without a size cap; bound it through
safeJson like the sibling routes. Label each reminder's enable/disable switch
by its own name span so screen readers hear the reminder rather than one
generic label repeated per row. Point the chronotype and illness disclosure
triggers at the regions they reveal via aria-controls.

src/components/illness/illness-view.tsx

@@ -15,7 +15,7 @@
  * per-day timeline and correlation card live. Retrospective-only copy — a
  * journal, not a medical device, and it does not diagnose.
  */
-import { useMemo, useState } from "react";
+import { useId, useMemo, useState } from "react";
 import Link from "next/link";
 import { ChevronDown, Plus, Stethoscope, Wrench } from "lucide-react";
 
@@ -245,10 +245,12 @@ function EpisodeGroup({
 }) {
   // Hooks must run unconditionally; bail on the empty render afterwards.
   const [open, setOpen] = useState(false);
+  const gridId = useId();
   if (parents.length === 0) return null;
 
   const grid = (
     <div
+      id={gridId}
       className={cn(
         view === "list" ? "space-y-2" : "grid gap-4 sm:grid-cols-2",
       )}
@@ -275,6 +277,7 @@ function EpisodeGroup({
           type="button"
           onClick={() => setOpen((v) => !v)}
           aria-expanded={open}
+          aria-controls={gridId}
           className="text-muted-foreground hover:text-foreground -mx-1 flex w-fit items-center gap-1.5 rounded-md px-1 py-0.5 text-xs font-medium uppercase tracking-wide transition-colors"
         >
           <ChevronDown