docs: update spectrum-ts documentation for v3.0.0

[photon-action-bot]

Documentation Update: spectrum-ts v3.0.0

This PR updates documentation for spectrum-ts based on the v3.0.0 release.

Release Notes

Breaking Changes

• platform.space(...) is now platform.space.create(...) for creating a space, and platform.space.get(id) for looking up an existing one.
• streamText() was removed from the public API. Pass streams directly to text(source, options) or markdown(source, options) instead; StreamTextOptions is now TextStreamOptions.
• resumableOrderedStream replaced isRetryableError with isCursorRejectedError. Other stream errors now retry automatically.

New Features

• Added markdown() for outbound styled text using CommonMark/GFM. Telegram and remote iMessage render it natively, while unsupported platforms fall back to readable plain text.
• Streaming text now works through text() and markdown(), including native Telegram private-chat drafts and existing iMessage streaming behavior. Platforms without streaming support wait for the stream to finish and send the full text.
• Added unsend() plus message.unsend() and space.unsend(), with iMessage support for retracting outbound messages.
• Reactions now return a Message handle instead of undefined, so you can keep that handle and unsend the reaction later. ✨

Bug Fixes

• effect() now accepts markdown content correctly, so markdown can be wrapped in supported iMessage effects.

Improvement

• Resumable streams are more resilient: reconnects keep retrying, backoff has a safer jitter floor, persistent failures get louder logs, and cursor rejection is handled separately from normal stream errors.

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Version: 3.0.0

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