fix(cli): show the last sync as a time in sync list and devices list

`pdfs sync list` and `pdfs devices list` printed the last sync as epoch
seconds, such as `synced: 1793570850` in issue #46. Both columns now go
through `last_synced`, which formats it like `pdfs activity` and prints
`never` for a folder that never synced. `--json` output is unchanged
(B278).

crates/pdfs-cli/src/main.rs

@@ -1036,10 +1036,7 @@ fn cmd_devices(action: DeviceCmd) -> Result<()> {
                 CtlResponse::Devices { items } if items.is_empty() => println!("No devices."),
                 CtlResponse::Devices { items } => {
                     for d in items {
-                        let sync = d
-                            .last_sync
-                            .map(|t| t.to_string())
-                            .unwrap_or_else(|| "never".to_string());
+                        let sync = last_synced(d.last_sync);
                         let tag = match (d.adopted, d.this_device) {
                             (true, _) => "  *adopted*",
                             (false, true) => "  *this machine*",
@@ -1130,11 +1127,7 @@ fn cmd_sync(action: SyncCmd) -> Result<()> {
                 }
                 CtlResponse::SyncFolders { items } => {
                     for f in items {
-                        let sync = if f.last_sync == 0 {
-                            "never".to_string()
-                        } else {
-                            f.last_sync.to_string()
-                        };
+                        let sync = last_synced(Some(f.last_sync));
                         // A queued switch is reported as the mode the folder is moving
                         // to, so `sync list` never reads as if the request was dropped.
                         let mode = match &f.pending_mode {
@@ -1915,6 +1908,15 @@ fn format_epoch(secs: i64) -> String {
     format!("{m:02}-{d:02} {h:02}:{mi:02}")
 }
 
+/// The `synced:` column of `sync list` and `devices list`: when the last pass
+/// finished, or `never`. The daemon reports 0 for a folder that never synced.
+fn last_synced(secs: Option<i64>) -> String {
+    match secs {
+        Some(secs) if secs > 0 => format_epoch(secs),
+        _ => "never".to_string(),
+    }
+}
+
 fn cmd_leave(uid: String) -> Result<()> {
     ok_or_bail(control_request(CtlRequest::LeaveShared { uid })?)
 }
@@ -4452,6 +4454,14 @@ mod login_wait_tests {
         assert_eq!(format_epoch_utc(-86_400), "1969-12-31");
     }
 
+    #[test]
+    fn last_synced_shows_a_time_not_epoch_seconds() {
+        // B278: issue #46 showed `synced: 1793570850`.
+        assert_eq!(last_synced(Some(1_793_570_850)), "11-01 22:07");
+        assert_eq!(last_synced(Some(0)), "never");
+        assert_eq!(last_synced(None), "never");
+    }
+
     #[test]
     fn a_forged_looking_invitation_is_flagged_not_stated() {
         let mut entry = pdfs_core::control::DirEntry {

docs/BUGS.md

@@ -109,6 +109,7 @@ a live account since.
 
 | Entry | Title |
 |---|---|
+| [B278](#b278--sync-list-and-devices-list-show-the-last-sync-as-epoch-seconds) | `sync list` and `devices list` show the last sync as epoch seconds |
 | [B277](#b277--my-files-mounted-over-a-folder-with-files-in-it-and-hid-them) | My files mounted over a folder with files in it, and hid them |
 | [B274](#b274--opening-a-file-for-writing-fails-with-eio-while-its-queued-revision-lands) | Opening a file for writing fails with EIO while its queued revision lands |
 | [B272](#b272--after-a-folder-is-removed-and-added-again-its-file-events-go-to-the-old-id) | After a folder is removed and added again, its file events go to the old id |
@@ -380,6 +381,26 @@ a live account since.
 
 Newest first.
 
+### B278 — `sync list` and `devices list` show the last sync as epoch seconds
+
+**Status:** Fixed, not verified live
+**Found:** 2026-11-02, issue #46. The reporter's `pdfs sync list` on 3.6.0 read
+`synced: 1793570850`, a pass that finished at 2026-11-01 22:07 UTC.
+**Where:** `cmd_sync` and `cmd_devices` in `crates/pdfs-cli/src/main.rs`
+
+**Repro:** Let a synced folder finish one pass and run `pdfs sync list`, or `pdfs devices list`
+on an account with a device that synced.
+
+**Cause.** Both commands printed `last_sync` with `to_string()`. The activity feed already
+formats the same epoch seconds with `format_epoch`.
+
+**Fix.** Both columns go through `last_synced`, which prints `MM-DD HH:MM` in UTC like
+`pdfs activity`, and `never` for 0 or no value. `--json` output is unchanged.
+
+**Test:** `last_synced_shows_a_time_not_epoch_seconds` in `crates/pdfs-cli/src/main.rs`.
+
+---
+
 ### B277 — My files mounted over a folder with files in it, and hid them
 
 **Status:** Fixed, not verified live
@@ -575,7 +596,9 @@ folder list has now.
 **Status:** Fixed, not verified live
 **Found:** 2026-10-31, code audit after issue #46: a folder of about 19,900 items restored on a
 second computer sat at `scanning…` with nothing downloaded, and the journal showed
-`RequestTimeout (http 408)`.
+`RequestTimeout (http 408)`. On 2026-11-01 the reporter's 3.6.0 journal showed the same pass
+failing four times in four minutes with `reconcile failed id=1 error=enumerate …: HTTP transport
+error`, after the laptop woke from sleep; a later pass finished.
 **Where:** `walk_remote` in `crates/pdfs-fuse/src/sync.rs`
 
 **Repro:** Restore or add a mirror folder with tens of thousands of items on Drive, on a link

docs/CHANGELOG.md

@@ -78,6 +78,9 @@ scratch (user data in `staging/` and `recovery/` is never touched by this).
 - **A restore that skipped folders is reported as failed**, with the reason for each, instead of
   "restored 0 folder(s)" as a success (B269).
 
+- **`pdfs sync list` and `pdfs devices list` show when a folder last synced as a time**, such as
+  `synced: 11-01 22:07` in UTC like `pdfs activity`, instead of seconds since 1970 (B278, #46).
+
 - **"You're offline" no longer appears for a cache or database error** when pinning, unpinning,
   searching or loading a folder (B266, #38). The app shows the actual error.