Add onboarding steps 1 and 2 with the first-run redirect

While household_settings.onboarding_completed_at is null, OnboardingGate
sends every app route to /onboarding, a full screen outside the shell.
The household settings parser now reads onboarding_completed_at from the
existing GET /api/v1/settings/household.

Step 1 welcomes the household and explains Regulars, Side quests and the
Quest log. Step 2 follows mock 1h: progress pills, the add pill with its
grape "+" (Enter also adds), Regulars chips with remove, dashed Common
picks, and "Next: notifications" enabled at 3 Regulars. Adds and removes
go through new dinners API hooks (POST /api/v1/dinners, DELETE
/api/v1/dinners/{id}) optimistically, rolled back if the server refuses.
Step 3 is a placeholder until its task lands.

Maestro task 5a43f813-c940-4f79-a2be-027644ae9e6c.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/test/ApiProviders.tsx

@@ -21,7 +21,7 @@ export const AI_SETTINGS = {
 export const AI_MODELS = { models: [{ id: 'claude-sonnet-4-5', display_name: 'Claude Sonnet' }] }
 
 // HOUSEHOLD_SETTINGS is a GET /api/v1/settings/household body: the seed
-// times in New York.
+// times in New York, onboarding finished.
 export const HOUSEHOLD_SETTINGS = {
   timezone: 'America/New_York',
   dinner_time: '17:30',
@@ -33,7 +33,7 @@ export const HOUSEHOLD_SETTINGS = {
   suggestions_time: '08:00',
   chat_autosend_dow: 6,
   chat_autosend_time: '08:00',
-  onboarding_completed_at: null,
+  onboarding_completed_at: '2026-10-01T15:30:00.000Z',
   updates_seen_at: null,
   updated_by: null,
   created_at: '2026-10-01T15:00:00.000Z',