Files · Transfers: file operations, a transfer queue, downloads and storage

A file on its way is a Transfer with a state: waiting, moving at a rate,
paused, done or failed with a reason. One row draws it for the queue and
the downloads: its icon, its way, a bar while it moves or waits paused, a
status with the time left, and only the actions its state allows.
TransferQueue counts what moves and waits. DownloadManager keeps the
finished below under Clear, opening on a press and showing their folder.
FileOperationProgress tells a copy or move with its bar, time left and
current file, its header wrapping by the header rule; a failure speaks in
the danger tone. StorageUsage points to data_display's UsageBar.

examples/gallery/pages/files/mod.rs

@@ -9,6 +9,7 @@ use jiff::{Timestamp, ToSpan};
 mod actions;
 mod explorer;
 mod find;
+mod transfers;
 
 use super::Page;
 use crate::{
@@ -216,5 +217,9 @@ fn render(window: &mut Window, cx: &mut App) -> AnyElement {
         .child(find::duplicates(window, cx))
         .child(find::archive(cx))
         .child(find::hex(window, cx))
+        .child(transfers::operations(window, cx))
+        .child(transfers::queue(window, cx))
+        .child(transfers::downloads(window, cx))
+        .child(transfers::storage(cx))
         .into_any_element()
 }