fix: calculate actual progress percentage for continue watching

migrations/015_add_duration.sql

@@ -0,0 +1,5 @@
+-- Add duration column to anime table to store episode duration in seconds
+ALTER TABLE anime ADD COLUMN duration_seconds REAL;
+
+-- Add duration_seconds column to continue_watching_entry to track episode duration
+ALTER TABLE continue_watching_entry ADD COLUMN duration_seconds REAL;