Added

Option to darken images on dark mode (#610)
Notification badges on Account Switcher entries (#767)
Manpage (#771, thanks @danialbehzadi)
Windows builds (#776)
More tracking IDs to be stripped (#781, #795, thanks @kop316)
Tracking parameter stripping on paste (#782, thanks @kop316)
1:1 character counting with Mastodon (including links, graphemes and mentions) (#599, #818)
Ability to zoom using Ctrl+ Mouse Wheel on the Media Viewer (#727, thanks @mgorny)
Update the 'verified' icon to one that matches the context better (#740)
New posts badge on 'Home' (#773)
Post and User reporting dialog (#787)
Error toasts when saving attachments (#793)
Filter handling and editing (#800)
Unread Announcements banner (#766)
Hide preview cards from own posts on notifications (#815)
Recent emojis in the Custom Emoji Chooser (#819)
More links in the About dialog (#820)
Syntax highlighting (both for mentions, emojis, hashtags and HTML & Markdown) (#823)
Do not show an icon when timelines are loading (#825)
Do not use a generic title when the timeline is empty (#825)
Syncing posting visibility with the instance (#827)
'New Post' to the main menu (#828)
Mutes & Blocks page (#831)
Unreviewed Follow Requests banner (#832)
Use libadwaita 1.5 AdwDialog when possible (#804, thanks @oscfdezdz)
Use gl instead of ngl for now (#847)
Show an icon on empty and error states of timelines (#848)
Appstream brand colors (#853, thanks @bragefuglseth, @LukaszH77)

Fixed

Incorrect use of title case where necessary (#737, thanks @MonsterObserver)
Replaced config.h with Build.vala, fixing Windows and macOS builds
Incorrect measurement of LabelWithWidgets when wrap, ellipsize and lines are set
libsecret backend for Windows and macOS (#776, #785)
Replacing attachments when saving (#793)
Strings missing ellipsis (#802, thanks @bragefuglseth)
Media sensitivity not being kept when editing posts (#811)
Media Viewer using keypress instead of shortcuts for actions (#812, thanks @alice-mkh)
Increased libsoup's max connections limits (#822)
Navigation not working between nested pages and non-nested pages of the same name (#826)
Media Viewer not opening the correct attachment right away and instead scrolling to it (#829)
Bugs involving multiple attachments and animations in the Media Viewer (#829)
libxml2 empty document warning (#830)
Other memory leaks and bugs (#799)

Syntax highlighting requires installing some gtksourceview themes and languages. Meson takes care of it but it might require additional changes on some distros. Let us know if there's anything we can do from our side to ease the process!

Full Changelog: v0.6.3...v0.7.0