Add a version/update dialog opened from a top-right toolbar button (current version, available version, Update now, auto-update toggle)

[JoshuaRowePhantom]

Summary

Add a top-right toolbar button in the main window that opens a dedicated "Version & Updates" dialog. The dialog must show:

• The current running version.
• The available/latest version.
• An Update now button.
• A checkbox/toggle to enable auto-updating.

This is primarily a wiring/surfacing task: the update ViewModel and View already exist and are reused today only from the ⚙ Settings dialog. We need a dedicated quick-access dialog in addition to Settings.

Root Cause / Current State

The update UI is fully implemented but is only reachable via the ⚙ Settings dialog. There is no top-level entry point for users to quickly check the version or trigger an update.

• Phantom.Workspaces/ViewModels/Configuration/UpdateSettingsViewModel.cs already exposes everything the new dialog needs:
  • RunningVersion (L65), LatestVersion (L98), IsUpdateAvailable (L105), IsBusy (L118), StatusText (L132).
  • Modes / SelectedMode (L62/L68) built from AutomaticUpdateMode (Off/NotifyOnly/DownloadAndInstall); record UpdateModeOption at L228.
  • RunAtStartup (L83).
  • CheckForUpdatesNowCommand (L139).
  • InstallUpdateNowCommand (L142) — gated on IsUpdateAvailable && !IsBusy. This is the "Update now" button.
• Phantom.Workspaces/Views/Configuration/UpdateSettingsView.axaml already renders current version (L13-14), the auto-update mode ComboBox (L19-27), a run-at-startup checkbox (L30-31), Check-for-updates + Install-update buttons (L34-38), and a status line (L41). Code-behind is empty boilerplate.
• Data source: IUpdateController (Phantom.Workspaces/Services/Updates/IUpdateController.cs) — RunningVersion (L24), Mode get/set (L27), LatestAvailableVersion (L30), IsRunAtStartupEnabled (L33), UpdateAvailabilityChanged event (L36), CheckForUpdatesAsync (L39), DownloadInstallAndRelaunchAsync (L45), SetRunAtStartup (L48). Runtime instance is available via (Application.Current as App)?.UpdateController.
• AutomaticUpdateMode { Off=0, NotifyOnly=1, DownloadAndInstall=2 } in WorkspacesConfiguration.cs (L119-129).
• Today the Updates section is only reachable via SettingsDialogWindow.axaml, which templates UpdateSettingsViewModel → UpdateSettingsView (L28-30) and is opened via the gear button (MainWindow.axaml.cs::OnOpenSettingsClicked, L165-193).

Because the VM/View already exist and cover every requirement, the change is: (a) add a new top-right button, (b) add a new lightweight UpdateDialogWindow that hosts the existing UpdateSettingsView, and (c) optionally add a simpler "auto-update" checkbox that maps to AutomaticUpdateMode.

Affected Files

File	Change
Phantom.Workspaces/MainWindow.axaml	Add a new button inside StackPanel x:Name="TopRightBar" (L63+, inside header Border L31, Grid.Column=2), adjacent to the ⚙ Settings button (~L164), using Classes="settings-gear top-right", distinct glyph and tooltip "Version & updates".
Phantom.Workspaces/MainWindow.axaml.cs	Add OnOpenUpdateDialogClicked handler mirroring OnOpenSettingsClicked (L165-193) / OnOpenConnectionStatusClicked (L195-206). Load config via ConfigurationPersistenceService, construct new UpdateSettingsViewModel(app.UpdateController, config.Updates, dispatch), then await new UpdateDialogWindow(vm).ShowDialog(this);.
Phantom.Workspaces/UpdateDialogWindow.axaml (new)	New Avalonia Window with WindowStartupLocation="CenterOwner", SizeToContent="WidthAndHeight", title "Version & Updates". Uses a <Window.DataTemplates> mapping UpdateSettingsViewModel → UpdateSettingsView (mirroring SettingsDialogWindow.axaml L28-30), or a ContentControl bound to the VM.
Phantom.Workspaces/UpdateDialogWindow.axaml.cs (new)	Ctor takes UpdateSettingsViewModel and assigns it as DataContext. Mirror ConnectionStatusWindow/CredentialManagerDialogWindow.
Phantom.Workspaces/Views/Configuration/UpdateSettingsView.axaml (optional)	Optionally add a simple "Enable auto-updates" checkbox mapped to AutomaticUpdateMode (checked ⇒ DownloadAndInstall, unchecked ⇒ NotifyOnly). Keep the existing full mode ComboBox for Settings.
Phantom.Workspaces/ViewModels/Configuration/UpdateSettingsViewModel.cs (optional)	If the checkbox is added, expose an AutoUpdateEnabled bool that maps to/from SelectedMode.
Phantom.Workspaces.Tests/Services/Updates/UpdateSettingsViewModelTests.cs	Extend with tests below (reuse existing FakeUpdateController).

Design / Fix

1. New window UpdateDialogWindow (Phantom.Workspaces/UpdateDialogWindow.axaml + .axaml.cs):

   • Avalonia Window, WindowStartupLocation="CenterOwner", SizeToContent="WidthAndHeight", Title="Version & Updates".
   • Declare a <Window.DataTemplates> mapping UpdateSettingsViewModel → UpdateSettingsView (as in SettingsDialogWindow.axaml L28-30), and host a ContentControl Content="{Binding}".
   • Constructor takes UpdateSettingsViewModel and sets DataContext. Mirror ConnectionStatusWindow / SettingsDialogWindow.

2. New top-right button in MainWindow.axaml:

   • Inside StackPanel x:Name="TopRightBar" (L63+), placed adjacent to the ⚙ Settings button (~L164).
   • Use Classes="settings-gear top-right" for visual consistency with the other top-right buttons (Network/Scheduled tasks/Credentials/Agents/Usage/Notifications/Save/Settings).
   • Distinct glyph (e.g. a version/up-arrow / cloud-download icon), tooltip "Version & updates", Click="OnOpenUpdateDialogClicked".

3. New handler OnOpenUpdateDialogClicked in MainWindow.axaml.cs:

   • Mirror OnOpenSettingsClicked (L165-193) — same config-load / VM-construct pattern — but for the update slice only.
   • Get UpdateController via (Application.Current as App)?.UpdateController.
   • Load current config through ConfigurationPersistenceService, take its Updates section.
   • Construct new UpdateSettingsViewModel(app.UpdateController, config.Updates, dispatch).
   • await new UpdateDialogWindow(vm).ShowDialog(this);.
   • Persistence of any changes must follow whatever pattern OnOpenSettingsClicked uses today (e.g. persist on close), so the quick dialog behaves consistently with the Settings entry point.

4. Auto-update checkbox (owner explicitly requested a checkbox, not a mode dropdown, for the quick dialog):

   • Recommend mapping the checkbox to AutomaticUpdateMode:
     • Checked ⇒ AutomaticUpdateMode.DownloadAndInstall.
     • Unchecked ⇒ AutomaticUpdateMode.NotifyOnly (i.e. still notify, do not auto-install).
   • Expose an AutoUpdateEnabled bool on UpdateSettingsViewModel that reads/writes SelectedMode accordingly, so the existing full Modes/SelectedMode ComboBox in Settings continues to work unchanged.
   • Only show the checkbox in the new dialog; the ⚙ Settings pane keeps the fuller mode selector.

5. "Update now" button and version display are already present in UpdateSettingsView.axaml:

   • Current version binding at L13-14, InstallUpdateNowCommand button at L34-38, StatusText line at L41. LatestVersion / IsUpdateAvailable from the VM (L98/L105) provide the "available version" surface. No behavioural change needed here.

6. Do not remove the Updates section from SettingsDialogWindow. Both entry points share the same VM and View. The new dialog is an additional, quick-access surface.

Expected Tests

Extend Phantom.Workspaces.Tests/Services/Updates/UpdateSettingsViewModelTests.cs (namespace Phantom.Workspaces.Tests.Updates, xUnit [Fact], existing Scenario_ExpectedBehavior style, reuse the inline FakeUpdateController implementing IUpdateController). Confirm exact class names by reading the existing test file first.

Test Name	Class	What It Verifies
UpdateSettingsViewModel_ExposesRunningAndLatestVersion	UpdateSettingsViewModelTests	The VM surfaces both RunningVersion and LatestVersion so the dialog can display current + available versions.
UpdateSettingsViewModel_InstallUpdateNowCommand_WhenUpdateAvailable_IsEnabled	UpdateSettingsViewModelTests	The "Update now" command (InstallUpdateNowCommand) is enabled only when IsUpdateAvailable && !IsBusy, and disabled otherwise.
UpdateSettingsViewModel_AutoUpdateCheckbox_MapsToDownloadAndInstallMode	UpdateSettingsViewModelTests	Toggling the auto-update checkbox (AutoUpdateEnabled) sets AutomaticUpdateMode to DownloadAndInstall when checked and NotifyOnly when unchecked, and flows the change to both the controller and the settings record.
UpdateSettingsViewModel_AutoUpdateCheckbox_ReflectsExistingMode	UpdateSettingsViewModelTests	When the VM is seeded with DownloadAndInstall, AutoUpdateEnabled is true; when seeded with NotifyOnly or Off, AutoUpdateEnabled is false.
MainWindow_OpenUpdateDialog_ShowsUpdateDialogWindowWithBoundViewModel	MainWindowViewModelTests (or a new MainWindowTests)	Invoking the top-right update-dialog button opens UpdateDialogWindow with a bound UpdateSettingsViewModel constructed from the current IUpdateController and UpdateSettings.

[JoshuaRowePhantom]

Closing as duplicate of the existing update-check settings area, per design owner's decision.

Every capability requested by this issue is already implemented and reachable today via the gear (⚙ Settings) dialog → Updates section. The issue body itself acknowledges "the update ViewModel and View already exist and cover every requirement"; the only delta is a second entry point (a top-right toolbar button), which the design owner has decided does not warrant a separate feature.

Existing coverage (features branch):

• Current version display — Phantom.Workspaces/Views/Configuration/UpdateSettingsView.axaml L12-15 (labelled "Current version", bound to RunningVersion), backed by UpdateSettingsViewModel.RunningVersion at ViewModels/Configuration/UpdateSettingsViewModel.cs L65.
• Available/latest version — surfaced via UpdateSettingsViewModel.LatestVersion (L98) and IsUpdateAvailable (L105), rendered through the status line UpdateSettingsView.axaml L41 ("Update available: {LatestVersion}" / "You are up to date (version …)", set in UpdateStatusText L221-224).
• "Update now" button — UpdateSettingsView.axaml L36-38 ("Install update") bound to InstallUpdateNowCommand (UpdateSettingsViewModel.cs L142, gated on IsUpdateAvailable && !IsBusy at L53-55). A companion "Check for updates" button is at L34-35 → CheckForUpdatesNowCommand (L139).
• Auto-update toggle — UpdateSettingsView.axaml L19-27 ComboBox bound to Modes/SelectedMode, backed by AutomaticUpdateMode { Off, NotifyOnly, DownloadAndInstall } and UpdateModeOption (UpdateSettingsViewModel.cs L39-45, L62/L68, L228). This is a superset of the requested checkbox.

The only difference from what this issue asks for is the entry point (a dedicated top-right toolbar button vs. reaching the same UI via ⚙ Settings → Updates). Per the design owner, that is not a substantive gap, so #1295 is being closed as a duplicate of existing functionality.