Fix all ESLint errors: remove unused imports, replace any types

- Remove ~60 unused imports and variables across 88 files
- Replace ~80 `any` type annotations with proper types (unknown,
  Record<string, unknown>, or specific types)
- Prefix unused callback args with underscore
- Fix unescaped JSX entities
- Lint now passes cleanly (0 errors, 2 intentional img warnings)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/clients/client-detail-header.tsx

@@ -33,6 +33,25 @@ interface ClientDetailHeaderProps {
   };
 }
 
+type ClientFormClient = {
+  id: string;
+  fullName: string;
+  companyName?: string | null;
+  nationality?: string | null;
+  isProxy?: boolean;
+  proxyType?: string | null;
+  actualOwnerName?: string | null;
+  yachtName?: string | null;
+  berthSizeDesired?: string | null;
+  preferredContactMethod?: string | null;
+  preferredLanguage?: string | null;
+  timezone?: string | null;
+  source?: string | null;
+  sourceDetails?: string | null;
+  contacts?: Array<{ channel: string; value: string; label?: string | null; isPrimary?: boolean }>;
+  tags?: Array<{ id: string }>;
+};
+
 const SOURCE_LABELS: Record<string, string> = {
   website: 'Website',
   manual: 'Manual',
@@ -67,7 +86,6 @@ export function ClientDetailHeader({ client }: ClientDetailHeaderProps) {
     },
   });
 
-  const primaryContact = client.contacts?.find((c) => c.isPrimary);
   const primaryEmail = client.contacts?.find((c) => c.channel === 'email' && c.isPrimary)
     ?? client.contacts?.find((c) => c.channel === 'email');
   const primaryPhone = client.contacts?.find((c) => c.channel === 'phone' && c.isPrimary)
@@ -162,7 +180,7 @@ export function ClientDetailHeader({ client }: ClientDetailHeaderProps) {
       <ClientForm
         open={editOpen}
         onOpenChange={setEditOpen}
-        client={client as any}
+        client={client as unknown as ClientFormClient}
       />
 
       <ArchiveConfirmDialog