Accounting platform: remove Zoho, unify reports, board access, vendor sharing

- Remove the Zoho Books integration (edge functions, sync libs, settings,
  reports/overview, banking links, fees tab, import dialog); preserve fee
  rules as a standalone FeesTab and the COA accounting_system classification.
- Financial Overview/Reports (staff + board) render the Accounting dashboard
  and reports; board reports mirror the rich Accounting Reports.
- New Reserve Fund Schedule report + an is_reserve flag on accounts.
- Unify all report exports to a branded format (logo + centered header +
  footer): shared ReportSheet (on-screen) and reportHeader (PDF). Budget vs
  Actuals and Bank Reconciliation PDFs now match the reference layout.
- Render financial reports inline (no preview pop-up).
- Budget Management mirrors Accounting Budgeting (staff-accessible) with SPA
  navigation; editable bills in the Accounting Bills page.
- Negative opening balances flow through to the GL and reports (allow negative
  input; keep non-zero on save; signed CSV import).
- Upload a per-account trial balance via CSV on Opening Balances.
- Board members: read-only RLS access to their association's accounting ledger;
  editable board-members panel on the association page; share vendor contacts
  with the board (toggle + directory section).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/SettingsSidebar.tsx

@@ -48,7 +48,6 @@ export const SETTINGS_PAGES = [
   {
     category: "Integrations",
     items: [
-      { path: "/dashboard/settings/zoho-books", title: "Zoho Books", icon: BookOpen },
       { path: "/dashboard/settings/buildium", title: "Buildium", icon: Building2 },
       { path: "/dashboard/settings/stripe-accounts", title: "Payment Gateways", icon: CreditCard },
       { path: "/dashboard/mailchimp", title: "Mailchimp", icon: Mail },