Keep literal braces in timeline message text #94

A sent message containing plain text canAttach={false} (not in backticks) renders in the timeline as canAttach=: the braces and their contents disappear, both visually and in the Accessibility text. The stored message keeps the full text (the channel summary generated from it preserves canAttach={false}), so only the timeline rendering drops it.

Cause

The timeline parses message text with comark (packages/ui/src/components/blocks/parse.ts), which treats {...} after text as MDC inline attributes and removes it. Reproduced directly with comark:

"respect canAttach={false}, and"   -> ["p",{},"respect canAttach=, and"]
"respect `canAttach={false}`, and" -> ["p",{},"respect ",["code",{},"canAttach={false}"],", and"]

Expected

Plain-text braces in chat messages render literally. Code, JSX props, and object literals are common in Ace messages, and text must never silently disappear from the timeline.

Observed while dogfooding #91 in Ace Canary 0.0.11. Part of #5.