feat: isolate all four portals with route groups + polished design system

Fix blank /org/login (and /admin/login): the guarded portal layout was
wrapping its own login route, rendering null when unauthenticated. Move
each portal's authed pages into a (authed)/(chapter) route group so login
pages live outside the guard.

Structure:
- app/(chapter)/* — chapter admin pages + guarded layout (was root-level)
- app/org/(authed)/* — org pages + guarded layout; /org/login now free
- app/admin/(authed)/* — admin pages + guarded layout; /admin/login free
- Root layout slimmed to providers only (no shared sidebar)
- Convert moved files' relative imports to @/app alias

Design system:
- PortalShell: shared sidebar shell (brand mark, themed active nav with
  accent bar, avatar dropdown user menu, loading skeletons)
- portal-theme.ts: per-portal theme tokens (violet/slate/blue/emerald)
- PortalLoginShell redesigned: two-column with gradient branding panel,
  dotted pattern, value-prop highlights, built-in back link
- New shadcn components: Avatar, DropdownMenu, Skeleton
- Move shared DraftCard to _components/draft-card.tsx (used by 2 portals)
- Portal selector: remove Super Admin card, icon tiles, hover lift
- All 4 login pages use react-hook-form + Zod + themed shell
- Member nav restored to full 11-section list with icons

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web/app/(chapter)/settings/rules/page.tsx

@@ -0,0 +1,36 @@
+import { RuleManager } from './RuleManager';
+import { apiFetch } from '@/app/_lib/api';
+
+interface RuleData {
+  id: string;
+  matchType: 'HASHTAG' | 'PREFIX' | 'REACTION_EMOJI';
+  matchValue: string;
+  action: 'FLAG' | 'AUTO_APPROVE' | 'SKIP' | 'REJECT';
+  priority: number;
+  isActive: boolean;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export default async function RulesSettingsPage() {
+  let rules: RuleData[] = [];
+  try {
+    const res = await apiFetch('/admin/rules');
+    if (res.ok) {
+      rules = (await res.json()) as RuleData[];
+    }
+  } catch {
+    rules = [];
+  }
+
+  return (
+    <div className="max-w-2xl">
+      <h1 className="text-xl font-semibold mb-6">Rules Engine</h1>
+      <p className="text-sm text-gray-600 mb-4">
+        Configure which hashtags, prefixes, and reaction emojis trigger message processing
+        and what action TOWER should take. Rules are matched in priority order.
+      </p>
+      <RuleManager initial={rules} />
+    </div>
+  );
+}