chore(ui): retire the Building2 icon app-wide (#2235)

Founder request from the register walkthrough. Suppliers (nav, command
palette, empty state) use Truck; company and company-scoped surfaces
(active company badge, invite, home signpost, SIE preview, template
scopes, TIC workspace and its manifest) use Briefcase; the two bank
contexts use Landmark. The extension icon resolver no longer maps
Building2; the generated sector definitions follow the manifest.

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

components/common/CommandPalette.tsx

@@ -8,7 +8,6 @@ import {
   ArrowLeftRight,
   Users,
   Wallet,
-  Building2,
   BookOpen,
   ListTree,
   BarChart3,
@@ -24,6 +23,7 @@ import {
   ArrowRight,
   Scale,
   type LucideIcon,
+  Truck,
 } from 'lucide-react'
 import { cn } from '@/lib/utils'
 import { useCompany } from '@/contexts/CompanyContext'
@@ -49,7 +49,7 @@ const ACTION_ENTRIES: Entry[] = [
 
 const PAGE_ENTRIES: Entry[] = [
   { id: 'kunder', label: 'Kunder', icon: Users, href: '/customers' },
-  { id: 'leverantörer', label: 'Leverantörer', icon: Building2, href: '/suppliers' },
+  { id: 'leverantörer', label: 'Leverantörer', icon: Truck, href: '/suppliers' },
   { id: 'kundfakturor', label: 'Kundfakturor', icon: ReceiptText, href: '/invoices', keywords: 'fakturor fakturering invoices kundfaktura' },
   { id: 'leverantörsfakturor', label: 'Leverantörsfakturor', icon: Wallet, href: '/supplier-invoices' },
   { id: 'bokföring', label: 'Bokföring', icon: BookOpen, href: '/bookkeeping', keywords: 'verifikat journal ledger' },