Add public help center with 10 topic pages and improve contractor/residence cards

- Create complete help center at /help with getting-started, residences, tasks,
  contractors, documents, sharing, dashboard, notifications, subscription, and
  account pages
- Add shared help components: sidebar, header, footer, article/section wrappers,
  screenshot placeholders, and tip/note/warning callouts
- Add /help to middleware public paths so it loads without auth
- Add Help Center link to landing page footer
- Link contractor import dialog to /help/sharing
- Make contractor cards fully clickable with consistent height
- Add clear button to contractor specialty filter
- Fix residence card height consistency in grid

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

src/components/help/help-nav-data.ts

@@ -0,0 +1,75 @@
+import {
+  BookOpen,
+  Home,
+  CheckSquare,
+  HardHat,
+  FileText,
+  Users,
+  LayoutDashboard,
+  Bell,
+  CreditCard,
+  UserCircle,
+} from "lucide-react";
+
+export const helpNavItems = [
+  {
+    label: "Getting Started",
+    href: "/help/getting-started",
+    icon: BookOpen,
+    description: "Set up your account and add your first home.",
+  },
+  {
+    label: "Residences",
+    href: "/help/residences",
+    icon: Home,
+    description: "Manage your properties and household members.",
+  },
+  {
+    label: "Tasks",
+    href: "/help/tasks",
+    icon: CheckSquare,
+    description: "Track maintenance with kanban boards and schedules.",
+  },
+  {
+    label: "Contractors",
+    href: "/help/contractors",
+    icon: HardHat,
+    description: "Organize your service providers and share contacts.",
+  },
+  {
+    label: "Documents",
+    href: "/help/documents",
+    icon: FileText,
+    description: "Store warranties, manuals, and important files.",
+  },
+  {
+    label: "Sharing",
+    href: "/help/sharing",
+    icon: Users,
+    description: "Invite household members and share contractors.",
+  },
+  {
+    label: "Dashboard",
+    href: "/help/dashboard",
+    icon: LayoutDashboard,
+    description: "Understand your dashboard overview and metrics.",
+  },
+  {
+    label: "Notifications",
+    href: "/help/notifications",
+    icon: Bell,
+    description: "Configure push notifications and reminders.",
+  },
+  {
+    label: "Subscription",
+    href: "/help/subscription",
+    icon: CreditCard,
+    description: "Free vs Pro plans and managing your subscription.",
+  },
+  {
+    label: "Account",
+    href: "/help/account",
+    icon: UserCircle,
+    description: "Profile, password, theme, and account settings.",
+  },
+];