feat(forms): builder UI, management pages, and public fill page (Phase 3)

- components/forms/form-renderer.tsx: one controlled renderer for all 8
  field types, shared by the builder preview and the public page
- components/forms/form-builder.tsx: easy builder — label-only field
  creation (keys auto-derived and de-duped at save), one-click type
  buttons, up/down reordering, inline options editor, live preview;
  edit mode adds publish/close/draft/delete and copy-public-link
- /forms directory, /forms/new, /forms/[id]/edit, /forms/[id]/results
  (CSV download). Server-gated by lib/forms-guard.ts (forms.manage via
  the same RPC the RLS uses; RLS remains the real boundary)
- public app/f/[slug] (outside the app group): getPublicForm serves
  only published public forms — members-only forms are never exposed
  there; waiver consent, anon email capture, signed-in gate for
  public_auth, thank-you state
- sidebar "Forms & waivers" link; sonner toasts (codebase convention)
- ARCHITECTURE + HANDOFF updated

285/285 tests, build clean, all four routes compiled. No deploy.

components/app-sidebar.tsx

@@ -14,7 +14,7 @@ import {
   Menu, X, LayoutDashboard, ListChecks, FolderKanban, Settings2, Wrench,
   MessageSquare, Users, CreditCard, BookUser, Download, LogOut,
   Vote, ShieldAlert, ScrollText, LineChart, UserCircle, UserSearch,
-  MessagesSquare, SlidersHorizontal,
+  MessagesSquare, SlidersHorizontal, ClipboardList,
 } from 'lucide-react'
 
 interface NavLinkProps {
@@ -144,6 +144,7 @@ export function AppSidebar({ member, roleName, taskBadge = 0, commsBadge = 0, pa
               <p className="text-[10px] uppercase tracking-widest text-[var(--sidebar-foreground)]/30 px-2 py-1 font-mono">Admin</p>
             </div>
             <NavLink href="/customize" label="Customize" icon={SlidersHorizontal} active={isActive('/customize')} onClick={onNav} />
+            <NavLink href="/forms" label="Forms & waivers" icon={ClipboardList} active={isActive('/forms')} onClick={onNav} />
             <NavLink href="/import" label="Import / Sync" icon={Download} active={isActive('/import')} onClick={onNav} />
             <NavLink href="/settings" label="Settings" icon={Settings2} active={isActive('/settings')} onClick={onNav} />
           </>