fix: blank mailing list from Projects, swipe flicker, hidden upload

Three problems from manual testing.

Opening a mailing list from More → Projects showed a blank screen, while the
same tap on a project pinned to Home worked. handleTabNavigation reset the
target path and appended to it two Task.yields later. When the target tab is
already on screen — Projects lives under More — the reset starts an animated pop
of the view the user is standing on and the appends land mid-animation. From
Home the tab actually changes, so the More stack is quiescent and the appends
land cleanly. Each case now builds its path and assigns it once, so SwiftUI gets
a single diff with nothing to race.

Destructive swipe actions made the row vanish and spring back while the
confirmation was still up. role: .destructive makes SwiftUI perform the row
removal on activation, which allowsFullSwipe: false does not prevent — the
report was a tap, not a full swipe. These buttons only record pending state and
wait for an answer, so they are plain buttons tinted red instead. Six sites: the
two added here, plus trackers, pastes, and tracker ACLs and labels, which had
the same flicker already.

The artifacts upload control was invisible. It was declared as a toolbar item
from a view that is a segment inside RepositoryDetailView's tab switch rather
than its own navigation destination, so it never reached the navigation bar. It
is a row in the list now, and also an action on the empty state — the overlay
covers the list, and a repository with no artifacts is precisely the one that
needs uploading.

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