Fix all TypeScript errors: restore proper types and typed route casts

- Restore `as any` casts for Next.js typedRoutes on dynamic routes
- Use proper types for PDF templates, invoice/expense data, DB schema
- Fix PgColumn casts in sort helpers for expenses/invoices
- Add null guards for optional port/client in record-export
- Fix vitest config (remove invalid poolOptions)
- Lint: 0 errors, TypeScript: 0 errors

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

src/components/clients/client-form.tsx

@@ -96,10 +96,10 @@ export function ClientForm({ open, onOpenChange, client }: ClientFormProps) {
         actualOwnerName: client.actualOwnerName ?? undefined,
         yachtName: client.yachtName ?? undefined,
         berthSizeDesired: client.berthSizeDesired ?? undefined,
-        preferredContactMethod: (client.preferredContactMethod as string) ?? undefined,
+        preferredContactMethod: (client.preferredContactMethod as CreateClientInput['preferredContactMethod']) ?? undefined,
         preferredLanguage: client.preferredLanguage ?? undefined,
         timezone: client.timezone ?? undefined,
-        source: (client.source as string) ?? undefined,
+        source: (client.source as CreateClientInput['source']) ?? undefined,
         sourceDetails: client.sourceDetails ?? undefined,
         contacts:
           client.contacts && client.contacts.length > 0