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Migrate the transfer progress UI to tuirealm 4, where the stdlib `ProgressBar` widget was dropped, by rebuilding the dual-bar panel on top of `Gauge`. - Restore the unified two-bar look: the full bar (top) and partial bar (bottom) draw joined borders so they read as a single panel; a single file shows one fully-bordered bar. - Redraw on every file boundary in the send/recv queue loops so the full bar's (N/total) counter advances even for small files that finish within one in-loop redraw interval. - Track progress with a single `TransferProgress` (exact file count from the pre-scan, lazy partial/full computation) and consolidate the theme progress-bar fields.