fix(progress): rework transfer progress panel (#424)

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.

src/ui/activities/setup.rs

@@ -104,7 +104,8 @@ pub enum IdTheme {
     MiscSave,
     MiscTitle,
     MiscWarn,
-    ProgBar,
+    ProgBarFull,
+    ProgBarPartial,
     StatusHidden,
     StatusSorting,
     StatusSync,
@@ -225,8 +226,10 @@ pub enum ThemeMsg {
     MiscSaveBlurUp,
     MiscWarnBlurDown,
     MiscWarnBlurUp,
-    ProgBarBlurDown,
-    ProgBarBlurUp,
+    ProgBarFullBlurDown,
+    ProgBarFullBlurUp,
+    ProgBarPartialBlurDown,
+    ProgBarPartialBlurUp,
     StatusHiddenBlurDown,
     StatusHiddenBlurUp,
     StatusSortingBlurDown,