Add expenses module, update dashboard financials, and enhance reservation payment management

supabase_schema_update_price.sql

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+-- Add price column to reservations table
+alter table reservations add column price decimal(10,2);
+
+-- Optional: Update existing reservations to set price from their package (snapshotting the price)
+update reservations 
+set price = packages.price
+from packages
+where reservations.package_id = packages.id;