feat: Public Guest Booking Engine & 100% Core Coverage

[TechAaroorian]

🚀 Overview

This PR introduces the core scheduling engine that powers the public-facing guest booking flow. It finalizes the end-to-end meeting creation cycle, from slot selection to database insertion, while maintaining strict timezone accuracy and preventing double-bookings.

🧠 Technical Architecture & Highlights

• Timezone-Aware DB Queries: Implemented startOfDay (via date-fns) in the Host Dashboard to ensure the gte query accurately reflects the start of the current day relative to the user, not just UTC new Date().
• Race Condition Prevention: The server action performs a sub-second findFirst check against existing overlapping PENDING or ACCEPTED bookings right before insertion to prevent double-booking.
• Empty String Normalization: Adjusted Zod schema parsing to normalize omitted optional fields (like guestNotes) into standard SQL NULL values using logical OR fallbacks (guestNotes || null).

🧪 Testing Strategy

• Achieved 100% Test Coverage (Statements, Branches

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	100%	88 / 88
🔵	Statements	100%	89 / 89
🔵	Functions	100%	13 / 13
🔵	Branches	100%	33 / 33

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
apps/app/app/actions/booking.ts	100%	100%	100%	100%
apps/app/lib/schemas/booking.ts	100%	100%	100%	100%

Generated in workflow #16 for commit 036f8c5 by the Vitest Coverage Report Action