feat: portal redesign — shadcn/ui, React Query, Zod, isolated portals

Foundation:
- CLAUDE.md with full coding rules (tech stack, patterns, redirect rules)
- Install @tanstack/react-query, zod, react-hook-form, shadcn/ui deps
- CSS variables design system (Tailwind v4 + tw-animate-css)
- Shared components: Button, Input, Label, Card, Badge, Separator, Form
- PortalLoginShell: two-column login layout (branding left, form right)
- PortalNav: shared sidebar nav used by all portals
- ReactQueryProvider in root layout
- api-client.ts: typed fetch wrapper (no raw fetch in components)

Portal isolation:
- Sidebar now returns null for all non-chapter routes; portals own their layout
- Admin layout: auth guard + PortalNav (slate accent)
- Org layout: auth guard + PortalNav (violet accent)
- Member layout: server-side cookie check → MemberNav client component
- Chapter admin sidebar: PortalNav (blue accent)

Login pages (all use react-hook-form + Zod + PortalLoginShell):
- /login → defaults next to /search (was /) — fixes redirect bug
- /admin/login → replaces /admin
- /org/login → replaces /org
- /member-login → two-step phone+OTP with proper form validation

Portal selector (/) redesigned with accent border-left cards

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

apps/web/package.json

@@ -9,11 +9,30 @@
     "lint": "next lint"
   },
   "dependencies": {
+    "@hookform/resolvers": "^5.4.0",
+    "@radix-ui/react-alert-dialog": "^1.1.17",
+    "@radix-ui/react-avatar": "^1.2.0",
+    "@radix-ui/react-dialog": "^1.1.17",
+    "@radix-ui/react-dropdown-menu": "^2.1.18",
+    "@radix-ui/react-label": "^2.1.10",
+    "@radix-ui/react-select": "^2.3.1",
+    "@radix-ui/react-separator": "^1.1.10",
+    "@radix-ui/react-slot": "^1.3.0",
+    "@radix-ui/react-toast": "^1.2.17",
+    "@radix-ui/react-tooltip": "^1.2.10",
+    "@tanstack/react-query": "^5.101.0",
     "@tower/types": "workspace:*",
     "@tower/ui": "workspace:*",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "lucide-react": "^1.21.0",
     "next": "^16.0.0",
     "react": "^19.0.0",
-    "react-dom": "^19.0.0"
+    "react-dom": "^19.0.0",
+    "react-hook-form": "^7.80.0",
+    "tailwind-merge": "^3.6.0",
+    "tw-animate-css": "^1.4.0",
+    "zod": "^3.23.0"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4.0.0",