Add profile name to tooltip & fix message count

This will look bad on some platforms and older versions for now, but
should fix a lot of crashes and we can report the rest as bugs.

This is causing probably more issues nowadays than it fixes. Qt should
be adding those menus for us now, so let's remove it and see, what
breaks!

Always allow sending messages by enter even with IMEs

Do not fetch Qt from Debian experimental when building for Qt6

Qt version in Debian Trixie is 6.6 as of September 2024. Therefore there
is no need to use experimental repositories.

Qt.inputMethod.visible is true in kwin_wayland when maliit is enabled and activated,
however kwin does not actually show maliit w/o touch input [1].

Moreover, having send by enter might still be desired even for virtual keyboards.

Remove the check for virtual keyboards as suggested by @deepbluev7,
people could still use Settings.invertEnterKey for newlines.

[1]: https://invent.kde.org/plasma/kwin/-/blob/v6.1.4/src/inputmethod.cpp?ref_type=tags#L185

Since otherwise the include might not be visible and we need those now.

Add number of unread messages to tray icon toolTip

Fixed build against fmt 11

No wayland on Haiku, fixes build errors

Flatpak: Dependency update

Add dialog for repeating password when exporting keys

Fixes #1757

Fixes #1756

fixes #1749