troc: add calendar scheduling feature for partnership calls

[cuevaio]

Summary

• New /schedule page with Cal.com embed for interested organizations to book partnership calls with the Crafter Station team
• Cal.com embed component (components/cal-embed.tsx) — reusable client component with dark theme, loading state, and configurable calendar link
• Schedule page includes an intro hero section, "What to Expect" breakdown (Introduction → Your Goals → Next Steps), the calendar embed, and alternative contact options (WhatsApp, community)
• Navigation updates: Added "Schedule" link to the home page header nav, replaced the solo "View Partnership Deck" CTA in the Partners section with a primary "Schedule a Call" button + secondary deck link, added Calendar icon + "Schedule a Call" as the primary CTA on the deck's contact slide
• Footer update: Added a new "Partners" column with "Schedule a Call" and "Partnership Deck" links

All new pages and components follow the existing design system (Void Black + Signal Red theme, editorial typography, decorative elements).

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This PR was generated by troc.

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