feat(tui): add self-update notification on startup

- Start Self_update_scheduler on TUI startup
- Check for octez-manager updates immediately on startup
- Show toast notification when update is available
- Recommend running 'octez-manager self-update' command
- Properly shutdown scheduler on exit

Fixes #538

Co-Authored-By: Claude <noreply@anthropic.com>

Author: vch9

CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
 
+### Added
+
+- TUI now shows notification when octez-manager update is available and recommends running `self-update` command
+
 ### Changed
 
 - Renamed "linked directories" to "registered directories" (CLI commands: `binaries link` → `binaries register`, `binaries unlink` → `binaries unregister`)

src/ui/pages/manager_app.ml

@@ -69,6 +69,20 @@ let run ?page ?(log = false) ?logfile () =
                latest_version
                current_str)
       | _ -> ()) ;
+  (* Start self-update scheduler to check for octez-manager updates *)
+  Self_update_scheduler.start () ;
+  (* Check immediately for octez-manager updates and show notification *)
+  Background_runner.enqueue (fun () ->
+      Self_update_scheduler.check_now () ;
+      if Self_update_scheduler.update_available () then
+        match Self_update_scheduler.get_latest_version () with
+        | Some version ->
+            Context.toast_info
+              (Printf.sprintf
+                 "octez-manager %s is available. Run 'octez-manager \
+                  self-update' to upgrade."
+                 version)
+        | None -> ()) ;
   let start_name = Option.value ~default:Instances.name page in
   let rec loop history current_name =
     if !quit_requested then raise Exit
@@ -93,6 +107,7 @@ let run ?page ?(log = false) ?logfile () =
     System_metrics_scheduler.shutdown () ;
     External_services_scheduler.shutdown () ;
     Versions_scheduler.shutdown () ;
+    Self_update_scheduler.stop () ;
     (* Cleanup: kill any active download process *)
     Common.kill_active_download () ;
     Ok ()