add scheduling functionality for experiments with new ScheduleModal component

supabase/migrations/20250721000001_add_scheduled_date.sql

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+-- Add scheduled_date field to experiments table
+-- This migration adds support for storing when experiments are scheduled to run
+
+-- Add scheduled_date column to experiments table
+ALTER TABLE public.experiments 
+ADD COLUMN IF NOT EXISTS scheduled_date TIMESTAMP WITH TIME ZONE;
+
+-- Create index for better performance when querying by scheduled date
+CREATE INDEX IF NOT EXISTS idx_experiments_scheduled_date ON public.experiments(scheduled_date);
+
+-- Add comment for documentation
+COMMENT ON COLUMN public.experiments.scheduled_date IS 'Date and time when the experiment is scheduled to run';