I don't think (or, let's hope..) that the current decline is a general overall decline, but rather a before summer decline like in 2023 before vacation where people tend to spend money on their and their families' recreation.
F11 toggles the Styles sidebar (in non-full-screen view..).
Try Shift+Ctrl+J to toggle Full Screen. If that doesn't work (non-English UI, other key bindings, ...) try Shift+Esc that presents a search command input field, enter full and it should list "View -> Full Screen" (in English UI); hit that.
Gitea has tea and Forgejo/Codeberg has berg, see also https://docs.codeberg.org/git/clone-commit-via-cli/#gitea-%2F-forgejo-cli-tea
Bad clickbait headline.
Depends on what your language's script is then with assigned Unicode characters, how wide-spread it is, when fonts will support the glyphs, and what you mean by "changes to be available on my local OS". What OS? What does available mean here? Do you expect the OS UI to be in your language? Doubtful. Some desktop environment maybe somewhen. Programs using ICU are more likely to support specific script related features (e.g. word/line breaking, transliteration) when ICU will support Unicode 16 in its next version. Locale specifics may have to wait for or could be contributed to CLDR that is also used by ICU. Availability of any UI in the language mostly depends on whether translators contribute to the relevant projects.
They are "looking for a more private" client. With the centralized Discord service that does anything it wants with any message there is no such thing.
Whatever client you use, there is no privacy with Discord. Period. Full stop.
Apparently not, you can check commits in https://git.tukaani.org/?p=xz.git;a=summary the first authored commit was 2022-01-28, then long time nothing until 2022-06-10, the first merge as committer was 2022-12-16.
In F-Droid https://f-droid.org/en/packages/com.google.android.stardroid/