docs: update spectrum-ts documentation for v12.0.0

[photon-action-bot]

Documentation Update: spectrum-ts v12.0.0

This PR updates documentation for spectrum-ts based on the v12.0.0 release.

Release Notes

Breaking Changes

• Spectrum({ platforms: [...] }) is no longer accepted; use Spectrum({ providers: [...] }) instead. This standardizes the API and docs around “providers” everywhere. (9b8e927)

New Features

• WhatsApp Business can now send approved template messages with whatsappTemplate(...), including language codes and body parameters. This is useful for reaching users outside WhatsApp’s 24-hour customer-service window. ✨

Bug Fixes

• WhatsApp Business quoted replies now come through as reply content with a target stub, so reply context is preserved on inbound messages.
• WhatsApp Business push-to-talk recordings now map to voice content instead of generic audio attachments.
• WhatsApp Business group sends now handle captioned media correctly and send other grouped content as sequential parts instead of dropping pieces.
• If a WhatsApp Business grouped send fails partway through, WhatsAppPartialSendError now reports which parts were already delivered so callers can avoid accidental duplicates.

Improvement

• WhatsApp Business now sends richlink and app URLs with native WhatsApp link previews when possible.

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Version: 12.0.0

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🤖 This PR was auto-generated by Claude Code via the update-docs action in buildspace.

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