Features
- fire WhatsApp alert to firm owner on silent website lead
- add LeadNote model with user + lead relations and migration
- add NotesSection component with inline note add/edit/delete thread
- add per-lead notes REST API with list, create, update, delete
- collapse filter bar into popover below xl and show icon-only buttons on small screens
- swap legacy notes textarea with NotesSection in edit mode
- add leadKeys.notes factory for per-lead note queries
- add leadNotes cache tag and invalidateLeadNotes helper
- bust lead notes cache on note mutations
- migration for LEAD_NEW_WEBSITE_CAPTURE template enum
- add LEAD_NEW_WEBSITE_CAPTURE to WhatsAppTemplateType enum
- extend leads-overview with proposalSent, lost and activePipeline KPIs
- extend LeadsOverviewKpis type with new status fields
- add New Website Lead Alert card to WhatsApp templates
- wire wa_lead_new_website_capture case with sample fixtures
- add LEAD_NEW_WEBSITE_CAPTURE type, slug, and data interface
- add sendLeadNewWebsiteCapture helper for firm owner alert