feat: wire offer→project phases/tasks, redo Offerte tab, cleanup project tabs

- importOfferIntoProject(): materializes project phases/tasks from the assigned
  tier's services grouped by services.fase (merge-by-title, dedup tasks)
- assignOfferToProject: optional import_phases flag triggers the import
- getProjectFullDetail: projectOffers/availableMicros now include macro name +
  tier_letter (dropdown shows "Offerta — Tier X"); availableMicros filters
  non-archived macros
- OffersTab redone: shows macro + tier badge, "Importa fasi e task" checkbox
- removed project "Preventivo" tab + deleted QuoteTab.tsx (legacy quote_items)
- sidebar: Lead before Clienti
- no DB migration (reuses existing tables)

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

src/components/admin/AdminSidebar.tsx

@@ -17,8 +17,8 @@ import {
 
 const NAV_ITEMS = [
   { href: "/admin",               label: "Dashboard",    icon: LayoutDashboard, exact: true },
-  { href: "/admin/clients",       label: "Clienti",      icon: Users },
   { href: "/admin/leads",         label: "Lead",         icon: Zap },
+  { href: "/admin/clients",       label: "Clienti",      icon: Users },
   { href: "/admin/projects",      label: "Progetti",     icon: FolderOpen },
   { href: "/admin/preventivi",    label: "Preventivi",   icon: FileText },
   { href: "/admin/offers",        label: "Offerte",      icon: Tag },