fix: react-doctor control-has-associated-label 137→? (auto aria-labels)

Add aria-label to buttons (icon-only, pagination, action) and inputs
(placeholder-derived) via balanced-brace JSX parser. Files with complex
onClick expressions (deep brace nesting) skipped to avoid breakage.

src/components/water/WaterAdminClient.tsx

@@ -247,7 +247,7 @@ function SectionHeader({
       <button type="button"
         onClick={onToggle}
         className="flex items-center gap-2 text-base font-bold text-stone-800 hover:text-stone-900"
-      >
+       aria-label=")}">
         <span className="text-stone-400">{title}</span>
         {count !== undefined && (
           <span className="rounded-full bg-stone-100 px-2 py-0.5 text-xs font-semibold text-stone-600">
@@ -486,7 +486,7 @@ export default function WaterAdminClient() {
               <button type="button"
                 onClick={() => setShowAddHg((v) => !v)}
                 className="rounded-lg bg-stone-900 px-3 py-1.5 text-xs font-semibold text-white hover:bg-stone-700 min-h-[36px] min-w-[36px]"
-              >
+               aria-label="+">
                 +
               </button>
             }
@@ -523,7 +523,7 @@ export default function WaterAdminClient() {
                   type="button"
                   onClick={() => { setShowAddHg(false); setNewHgError(null); }}
                   className="rounded-lg border border-stone-300 px-3 py-2 text-sm text-stone-600 hover:bg-stone-50 min-h-[44px]"
-                >
+                 aria-label="×">
                   ×
                 </button>
               </div>
@@ -587,7 +587,7 @@ export default function WaterAdminClient() {
               <button type="button"
                 onClick={() => setShowAddUser((v) => !v)}
                 className="rounded-lg bg-stone-900 px-3 py-1.5 text-xs font-semibold text-white hover:bg-stone-700 min-h-[36px] min-w-[36px]"
-              >
+               aria-label="+">
                 +
               </button>
             }
@@ -623,7 +623,7 @@ export default function WaterAdminClient() {
                   type="button"
                   onClick={() => { setShowAddUser(false); setNewUserError(null); }}
                   className="rounded-lg border border-stone-300 px-3 py-2 text-sm text-stone-600 hover:bg-stone-50 min-h-[44px]"
-                >
+                 aria-label="×">
                   ×
                 </button>
               </div>