chore(deps): update omniauth packages (renovate[bot])
https://github.com/mastodon/mastodon/pull/31857

Add ability to email announcements to all users (ClearlyClaire)
https://github.com/mastodon/mastodon/pull/33928

chore(deps): update eslint (non-major) (renovate[bot])
https://github.com/mastodon/mastodon/pull/33061

chore(deps): update yarn to v4.7.0 (renovate[bot])
https://github.com/mastodon/mastodon/pull/34047

Fix processing errors for some HEIF images from iOS 18 (renchap)
https://github.com/mastodon/mastodon/pull/34086

Change hashtag suggestion to prefer personal history capitalization (ClearlyClaire)
https://github.com/mastodon/mastodon/pull/34070

Convert `settings/sessions` spec controller->system (mjankowski)
https://github.com/mastodon/mastodon/pull/34072

Add emoji from Twemoji 15.0 to the emoji picker/completion (eramdam)
https://github.com/mastodon/mastodon/pull/33395

Move `app/javascript/hooks` to `app/javascript/mastodon/hooks` (ClearlyClaire)
https://github.com/mastodon/mastodon/pull/34077

Change web client settings to be saved earlier and more often (ClearlyClaire)
https://github.com/mastodon/mastodon/pull/34074

Add simple feature flag system (oneiros)
https://github.com/mastodon/mastodon/pull/34038