Add booking flow, business hours, and dark mode support

Features:
- Complete multi-step booking flow with service selection, date/time picker,
  auth (login/signup with email verification), payment, and confirmation
- Business hours settings page for defining when business is open
- TimeBlock purpose field (BUSINESS_HOURS, CLOSURE, UNAVAILABLE)
- Service resource assignment with prep/takedown time buffers
- Availability checking respects business hours and service buffers
- Customer registration via email verification code

UI/UX:
- Full dark mode support for all booking components
- Separate first/last name fields in signup form
- Back buttons on each wizard step
- Removed auto-redirect from confirmation page

API:
- Public endpoints for services, availability, business hours
- Customer verification and registration endpoints
- Tenant lookup from X-Business-Subdomain header

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/hooks/useTimeBlocks.ts

@@ -128,7 +128,9 @@ export const useBlockedDates = (params: BlockedDatesParams) => {
         queryParams.append('include_business', String(params.include_business));
       }
 
-      const { data } = await apiClient.get(`/time-blocks/blocked_dates/?${queryParams}`);
+      const url = `/time-blocks/blocked_dates/?${queryParams}`;
+      const { data } = await apiClient.get(url);
+
       return data.blocked_dates.map((block: any) => ({
         ...block,
         resource_id: block.resource_id ? String(block.resource_id) : null,