fix(stops): change stops.date from TIMESTAMPTZ to DATE

The stops.date column was created as TIMESTAMPTZ but is used as a
calendar date throughout the app. Supabase returned it as a
'YYYY-MM-DD HH:MM:SS+TZ' string, which made the existing
'new Date(s.date + "T00:00:00")' parsing in the client produce
Invalid Date objects — leaving the Stops & Routes calendar empty.

Changing the column to DATE makes Supabase return a clean 'YYYY-MM-DD'
string that the existing local-time parsing handles correctly.

- ALTER stops.date TYPE DATE USING date::DATE
- Recreate get_public_stops_for_brand with date DATE in RETURNS TABLE
  (DROP + CREATE required because CREATE OR REPLACE refuses to change
  the OUT-parameter row type — PostgreSQL error 42P13)

The time (TEXT 'HH:MM') and cutoff_time (TIMESTAMPTZ) columns are
unchanged — they legitimately carry time-of-day information.

supabase/migrations/208_stops_date_to_date.sql

@@ -0,0 +1,73 @@
+-- Migration 208: Change stops.date from TIMESTAMPTZ to DATE
+--
+-- Why
+-- ---
+-- The `stops.date` column was created as TIMESTAMPTZ but is used throughout
+-- the app as a calendar date (no time-of-day component). The mismatch
+-- forces every client consumer to do `new Date(s.date + "T00:00:00")` to
+-- coerce the timestamp into a local-midnight Date — and that hack silently
+-- produces an Invalid Date when Supabase returns a `2026-06-15 00:00:00+00`
+-- style string, leaving the Stops & Routes calendar empty.
+--
+-- Storing the column as DATE makes Supabase return a clean `YYYY-MM-DD`
+-- string, which the existing `+ "T00:00:00"` parsing handles correctly.
+--
+-- The `time` (TEXT, "HH:MM") and `cutoff_time` (TIMESTAMPTZ) columns are
+-- unchanged — they legitimately carry time-of-day information.
+--
+-- Affected RPC
+-- -------------
+-- `get_public_stops_for_brand` declares `date TIMESTAMPTZ` in its
+-- RETURNS TABLE. Recreate it with `date DATE` so the return type matches
+-- the underlying column.
+
+-- 1. Drop the existing RPC so we can recreate it with a new return type.
+--    PostgreSQL refuses CREATE OR REPLACE when the OUT-parameter row type
+--    changes (error 42P13).
+DROP FUNCTION IF EXISTS get_public_stops_for_brand(TEXT);
+
+-- 2. Convert the column. USING date::DATE truncates the time component,
+--    which is what we want — all existing rows are stored at 00:00 anyway.
+ALTER TABLE public.stops
+  ALTER COLUMN date TYPE DATE USING date::DATE;
+
+-- 3. Recreate the public RPC with the corrected return type.
+CREATE OR REPLACE FUNCTION get_public_stops_for_brand(p_brand_slug TEXT)
+RETURNS TABLE (
+  id UUID,
+  city TEXT,
+  state TEXT,
+  date DATE,
+  "time" TEXT,
+  location TEXT,
+  address TEXT,
+  slug TEXT,
+  cutoff_time TIMESTAMPTZ
+)
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path = public
+AS $$
+BEGIN
+  RETURN QUERY
+  SELECT
+    s.id,
+    s.city,
+    s.state,
+    s.date,
+    s."time",
+    s.location,
+    s.address,
+    s.slug,
+    s.cutoff_time
+  FROM stops s
+  INNER JOIN brands b ON s.brand_id = b.id
+  WHERE s.active = true
+    AND b.slug = p_brand_slug
+  ORDER BY s.date ASC;
+END;
+$$;
+
+GRANT EXECUTE ON FUNCTION get_public_stops_for_brand(TEXT) TO anon;
+GRANT EXECUTE ON FUNCTION get_public_stops_for_brand(TEXT) TO authenticated;
+GRANT EXECUTE ON FUNCTION get_public_stops_for_brand(TEXT) TO service_role;