Critical SQL fixes (pages were crashing):
- GlobalSearch: remove non-existent branch_id/invoice_number, fix relationship
- RevenueWidget: payment_method → method
- FinancialReport: line_total → total_amount, balance_due → due_amount
- PaymentPlanCreate: rewrite to match actual payment_plans/installments schema

High-priority display fixes (features showing null):
- invoice_number → number (8 locations)
- balance_due → due_amount (6 locations)
- full_name_ar → full_name (7 locations, accessor doesn't exist)
- payment_method → method in print view
- subtotal → subtotal_amount
- description → notes on invoice
- line_total → total_amount on invoice items
- receipt_number → reference on payment

Medium fixes:
- Dashboard: fix format() call on string time column
- Participant card: access person fields via relationship

Low fixes:
- daily-financial-print: createdBy → creator relationship
- reports-page: payment_method key → method

Infrastructure:
- Add migration for cash_session_id on payments table
- Add cash_session_id to Payment model fillable
- Fix float → decimal:2 casts on Evaluation/EvaluationScore
- Update enum registry docs to match actual DB CHECK constraints
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>