fix(web): persist uncertain birth time as a start/end clock window

Users pick a clock range instead of a coarse period plus notes, so
rectification and window consult scan that range instead of a leftover afternoon bucket.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/app/api/onboarding/route.ts

@@ -20,7 +20,7 @@ function createProfileRepository(
     async loadProfile(userId) {
       return admin
         .from("profiles")
-        .select("id,name,birth_date,birth_time,reported_birth_time,active_birth_time,birth_time_source,birth_time_period,birth_time_clue,uncertainty_before_minutes,uncertainty_after_minutes,birth_time_status,country_code,province_code,city_code,district_code,latitude,longitude,timezone_offset,birth_place_label,birth_place_type,birth_place_provider,birth_place_provider_id,timezone_id,timezone_source,onboarding_payload,onboarding_version,onboarding_generated_at")
+        .select("id,name,birth_date,birth_time,reported_birth_time,active_birth_time,birth_time_source,birth_time_period,declared_window_start,declared_window_end,birth_time_clue,uncertainty_before_minutes,uncertainty_after_minutes,birth_time_status,country_code,province_code,city_code,district_code,latitude,longitude,timezone_offset,birth_place_label,birth_place_type,birth_place_provider,birth_place_provider_id,timezone_id,timezone_source,onboarding_payload,onboarding_version,onboarding_generated_at")
         .eq("id", userId)
         .maybeSingle();
     },