chore: prepare release 1.15.2

[sable-release-bot]

Important

Merging this PR will create a new release.

Fixes

• Adds back the message editor toolbar under an optional setting. No longer uses WYSIWYG, just applies markdown. http://localhost:8080/settings/general?focus=composer-formatting-toolbar&moe.sable.client.action=settings (#762 by @7w1)
• Fixed blockquotes needing a double backslash to escape and require a space after the > in order to form a blockquote. (#758 by @7w1)
• Fix empty messages being displayed as broken messages. (#754 by @7w1)
• Reescape arrow brackets when editing a message. (#763 by @7w1)
• Fix extraneous markdown escape characters when editing code blocks. (#762 by @7w1)
• Fixed jumpting to arbitrary events (e.g. reactions, edits, pins, leaves/joins). (#759 by @7w1)
• Fix latex in codeblocks getting parsed. (#758 by @7w1)
• Fixed message links being rendered as full links. (#751 by @7w1)
• Fixed per-message profile proxies not unwrapping and generally just not working. (f8a9a8f)
• Fixed tweak automatic favoriting behavior when entering/leaving the catalog. (#757 by @7w1)
• Fix tweaks not applying on built-in themes. (#756 by @7w1)
• Added the ability to underline using __underscores__. (#761 by @7w1)

[github-actions]

Deploying with    Cloudflare Workers

Status	Preview URL	Commit	Alias	Updated (UTC)
✅ Deployment successful!	https://pr-752-sable.raspy-dream-bb1d.workers.dev	3b5c39f	pr-752	Thu, 07 May 2026 05:43:48 GMT