Follow-up fix:
- Labels now use your existing tables: customer_lable and customer_lable_customers.
- Audience add/edit has collapsible filter blocks: Country, Priority, Labels, Leads/Items, Pick Customers Manually.
- Manual selected customers are included with the filter results.
- Audience save refreshes audience_customers from current rules.
- Campaign dynamic target uses the same improved filter UI.
- Campaign send now attempts real sending through the same channels used by customer communication: WhatsApp API, PHPMailer email, SMS API, then logs to communications and campaign_logs.

Run:
migrations/2026_06_04_audience_campaign_customer_lable_fix.sql
