Fix settings navigation routing

Replace hash links in the settings side navigation with button-driven in-page scrolling so the hash router does not leave the settings page.

apps/dashboard/src/SettingsPanel.tsx

@@ -32,31 +32,15 @@ interface AccountData {
 }
 
 const SETTINGS_NAV_ITEMS = [
+  { targetId: 'settings-general', title: '일반', detail: '표시 · 언어' },
   {
-    href: '#settings-general',
-    title: '일반',
-    detail: '표시 · 언어',
-  },
-  {
-    href: '#settings-models',
+    targetId: 'settings-models',
     title: '모델',
     detail: 'owner · reviewer · arbiter',
   },
-  {
-    href: '#settings-moa',
-    title: 'MoA',
-    detail: '참조 모델 · 연결 테스트',
-  },
-  {
-    href: '#settings-codex',
-    title: 'Codex',
-    detail: 'fast mode · /goal',
-  },
-  {
-    href: '#settings-accounts',
-    title: '계정',
-    detail: 'Claude · Codex',
-  },
+  { targetId: 'settings-moa', title: 'MoA', detail: '참조 모델 · 연결 테스트' },
+  { targetId: 'settings-codex', title: 'Codex', detail: 'fast mode · /goal' },
+  { targetId: 'settings-accounts', title: '계정', detail: 'Claude · Codex' },
 ] as const;
 
 export interface SettingsPanelProps {
@@ -171,13 +155,25 @@ function SettingsHero() {
 }
 
 function SettingsNav() {
+  const scrollToSection = (targetId: string) => {
+    document
+      .getElementById(targetId)
+      ?.scrollIntoView({ behavior: 'smooth', block: 'start' });
+  };
+
   return (
     <aside className="settings-nav" aria-label="설정 섹션">
       {SETTINGS_NAV_ITEMS.map((item) => (
-        <a href={item.href} key={item.href}>
+        <button
+          aria-controls={item.targetId}
+          data-settings-target={item.targetId}
+          key={item.targetId}
+          onClick={() => scrollToSection(item.targetId)}
+          type="button"
+        >
           <strong>{item.title}</strong>
           <small>{item.detail}</small>
-        </a>
+        </button>
       ))}
     </aside>
   );