The Wails v3 tray is a pure DBus StatusNotifierItem implementation and no
longer links libappindicator (a Fyne-era dependency). Drop the
libayatana-appindicator runtime and build deps, and move the rpm package
and dev-dependency docs onto the GTK4 / WebKitGTK 6.0 stack that the
default (non-gtk3) build actually links against.
Follow-up to the rename commit: the previous commit moved the files but
the post-mv string substitutions (Go imports, frontend bindings, CI
config paths) were not re-staged so they slipped through. This commit
applies those edits and removes the fyne dependencies from go.mod/go.sum
now that the legacy fyne UI is gone.
Removes the legacy fyne-based client/ui implementation and renames the
Wails replacement (client/ui-wails) to take its place at client/ui. Go
imports, frontend bindings, CI workflows, goreleaser configs and the
windows .syso icon path are updated to follow the rename.
