feat: add reserve-bay route with allocation summary

[iamasx]

Summary

• Adds a new reserve-bay route under the app router with reservation cards, availability snapshots by zone, and a compact allocation summary panel.
• Creates mock data for reservations (5 entries), availability zones (4 zones), and allocation categories (4 categories) with typed interfaces.
• Builds three components: ReservationCard, AvailabilitySnapshotCard, and AllocationSummary following existing codebase patterns (CSS modules + Tailwind, role/aria attributes, tone-mapped styling).
• Adds the route to the global navigation in layout.tsx.
• Includes test coverage for main route headings, availability zone rendering, reservation/allocation counts, and responsive layout grid classes.

Closes #208

Test plan

• Production build passes (npm run build)
• ESLint passes (npm run lint)
• Route renders reservation cards with status badges (confirmed/pending/expired)
• Availability snapshot cards show zone occupancy with progress bars
• Allocation summary panel displays utilization per category
• Layout is usable on narrow and wide viewports
• CI checks pass

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