feat: sidebar CTA removal, delete phase/task, public dashboard UX, chat panel

1. AdminSidebar: removed yellow "Genera preventivo" CTA (duplicated Preventivi tab nav item)
2. Delete phase/task: new deletePhase/deleteTask server actions with FK cascade and phase-status recompute; DeletePhaseTaskButton client component with window.confirm; trash icons in PhasesTab per phase and per task
3. Public dashboard: extend activeOffers query with offer_macros join (offer_name, offer_type); reorder sidebar 1°Offerte 2°Pagamenti 3°Documenti; OffersSection shows macro public_name as heading (never tier letter/internal_name); PaymentStatus gains totalLabel/overrideAmount/hideRows props — retainer=monthly label + no Acconto/Saldo rows
4. Offer editor: Descrizione textarea (nota interna) and Modalità toggle moved directly under title; Tags section now contains only Categoria/Ticket/Tipo/Obiettivo
5. Basecamp chat: API route supports entity_type="phase" with authorization scoping; comments scope in client-view broadened to include phaseIds and client_id (general); CommentsTab updated with phase/general entities; ChatProvider React context; ChatPanel fixed slide-in panel with FAB (bottom-right) and composer tag selector (Generale + phases); PhaseCard gets chat-bubble icon pre-tagging that phase; inline ChatSection block removed from dashboard main column

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

src/components/admin/AdminSidebar.tsx

@@ -39,17 +39,6 @@ export function AdminSidebar() {
         <span className="font-bold text-white tracking-tight text-sm">iamcavalli</span>
       </div>
 
-      {/* CTA globale — genera preventivo */}
-      <div className="px-3 py-3 border-b border-white/10">
-        <Link
-          href="/admin/preventivi/genera"
-          className="flex items-center justify-center gap-2 w-full px-3 py-2 rounded-md text-xs font-semibold bg-[#DEF168] text-[#1A463C] hover:bg-[#d4e85e] transition-colors"
-        >
-          <FileText size={13} />
-          Genera preventivo
-        </Link>
-      </div>
-
       {/* Nav links */}
       <nav className="flex-1 px-3 py-4 flex flex-col gap-0.5">
         {NAV_ITEMS.map(({ href, label, icon: Icon, exact }) => {