fix(core,fuse,cli,gui): say when an upgrade left the old daemon running

A package upgrade replaces the binaries but does not restart the user
service, so the daemon keeps the old release and its bugs until the next
login. On 3.2.0 the reporter of #33 still saw "Couldn't sync Documents:
read .../snapshots/37: Permission denied", which only a daemon older than
3.2.0 can produce: since then the scan leaves an unreadable subfolder out
and only an unreadable sync root fails the pass (B206).

The daemon now reports its release in Status; one from before the field
omits it, which reads as older. When the daemon is older than the
front-end, the tray says "Update not finished - restart Proton Drive" and
offers a restart, the sync card shows "Restart to finish updating" with a
Restart button, and pdfs status and pdfs diagnose print the systemctl
command. A newer daemon is not flagged, since then the front-end is the
stale one.

Refs #33

crates/pdfs-cli/src/main.rs

@@ -15,7 +15,7 @@ use pdfs_core::config::AppDirs;
 use pdfs_core::control::{
     ConflictKeep, ErrorKind, MountKind, RefreshScope, Request as CtlRequest,
     Response as CtlResponse, RestoreItem as CtlRestoreItem, ShareEntryKind, SyncIssue, SyncPhase,
-    pending_summary,
+    daemon_outdated, pending_summary,
 };
 use pdfs_core::db::Db;
 use pdfs_core::service;
@@ -2026,6 +2026,7 @@ fn cmd_status() -> Result<()> {
             paused_until,
             session_expired,
             tokens_unsaved,
+            version,
             ..
         }) => {
             let state = match (online, paused) {
@@ -2067,6 +2068,9 @@ fn cmd_status() -> Result<()> {
                     "Keyring    refuses the refreshed sign-in; unlock it, or a reboot needs `pdfs login`"
                 );
             }
+            if daemon_outdated(&version) {
+                println!("Daemon     {}", outdated_daemon_note(&version));
+            }
         }
         Ok(other) => println!("Mount: unexpected response {other:?}"),
         Err(_) => println!("Mount: not running."),
@@ -2074,6 +2078,20 @@ fn cmd_status() -> Result<()> {
     Ok(())
 }
 
+/// What `pdfs status` and `pdfs diagnose` say about a daemon still running
+/// an older release than this CLI.
+fn outdated_daemon_note(version: &str) -> String {
+    let running = if version.is_empty() {
+        "an older release".to_string()
+    } else {
+        version.to_string()
+    };
+    format!(
+        "still runs {running}, this is {}; run `systemctl --user restart proton-drive` to finish the update",
+        env!("CARGO_PKG_VERSION"),
+    )
+}
+
 fn cmd_locations() -> Result<()> {
     let response = control_request(CtlRequest::ListLocations)?;
     if emit_json(&response)? {
@@ -3444,9 +3462,17 @@ fn cmd_diagnose() -> Result<()> {
             tokens_unsaved,
             pending_uploads,
             pending_changes,
+            version,
             ..
         }) => {
             report.finding(DiagnoseLevel::Ok, "  daemon responding", "");
+            if daemon_outdated(&version) {
+                report.finding(
+                    DiagnoseLevel::Warn,
+                    "  daemon version",
+                    outdated_daemon_note(&version),
+                );
+            }
             let live_type = mounted_fs_type(Path::new(&mountpoint));
             let is_fuse = live_type
                 .as_deref()