UI overhaul: minimal top bar, license-first settings, footer-pinned check

Top bar (3-column layout)
-------------------------
- Col 1: PROSERVE Launcher wordmark.
- Col 2: license badge centered, the badge IS the click target now (a
  Border with an InputBindings MouseBinding LeftClick to OpenLicense).
  No more separate "🔑 Activer / changer" button cluttering the right.
- Col 3: ⚙ Paramètres + window chrome (min/max/close).
- "📁 Dossier" button removed from the top bar — install root is still
  reachable from Settings.

Footer (always visible)
-----------------------
- Row 1: "🔄 Vérifier les MAJ" pinned bottom-left, always shown. The
  optional "Annuler" button stays bottom-right while a download runs.
- Row 2: status text + progress bar, only shown when busy or after a
  status message — the previous "footer entirely hidden when idle"
  hid the check button too.

License flow split in two
-------------------------
Click on the license badge:
- License is active (valid / expired / revoked) → LicenseDetailsDialog
  opens. Header pill in matching status color (green/amber/red), shows
  owner, validity, issued date, machine ID with copy-to-clipboard. Two
  buttons: "🗑 Désactiver la license" (with confirmation) and Close.
- No license OR after deactivation → falls through to the existing
  OnboardingDialog for re-keying.

Settings rework
---------------
LICENSE section is now first in SettingsDialog with the same
green/amber/red colored chrome as the top bar — at a glance the user
sees the same status everywhere. Machine ID copy moved into this card.

Sign-manifest no longer needs exec()
------------------------------------
The "🔁 Sync" button in admin/versions.php previously shelled out to
`php tools/sign-manifest.php` via exec(). OVH mutualisé often disables
exec(), causing silent no-ops and the symptom the user just hit: the
ZIP changed (new size 469,657,770 vs manifest's stale 469,831,428) and
the launcher rejected it as size mismatch.

Refactor:
- New PSLauncher\Tools\SignManifest class with ->run() that does the
  hashing, latest-bump and Ed25519 signing in-process.
- tools/sign-manifest.php is now a 6-line wrapper for the class.
- admin/versions.php's 'sync' action calls the class directly via
  require_once + new — works on any host, no exec dependency.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/PSLauncher.App/Views/LicenseDetailsDialog.xaml.cs

@@ -0,0 +1,86 @@
+using System.Windows;
+using System.Windows.Media;
+using PSLauncher.Core.Licensing;
+using PSLauncher.Models;
+
+namespace PSLauncher.App.Views;
+
+public partial class LicenseDetailsDialog : Window
+{
+    private readonly ILicenseService _licenseService;
+    private readonly LicenseValidationResponse _license;
+
+    public bool DeactivateRequested { get; private set; }
+
+    public LicenseDetailsDialog(ILicenseService licenseService, LicenseValidationResponse license)
+    {
+        _licenseService = licenseService;
+        _license = license;
+        InitializeComponent();
+
+        var (icon, title, subtitle, color, bgColor) = ResolveStyle(license);
+        StatusIconText.Text = icon;
+        StatusIconText.Foreground = new SolidColorBrush(color);
+        StatusTitleText.Text = title;
+        StatusSubtitleText.Text = subtitle;
+        HeaderBorder.Background = new SolidColorBrush(bgColor);
+        HeaderBorder.BorderBrush = new SolidColorBrush(color);
+
+        OwnerText.Text = license.OwnerName ?? "—";
+        UntilText.Text = license.DownloadEntitlementUntil is { } until
+            ? $"jusqu'au {until.ToLocalTime():dddd dd MMMM yyyy}"
+            : "—";
+        IssuedText.Text = license.IssuedAt is { } issued
+            ? issued.ToLocalTime().ToString("dd/MM/yyyy")
+            : (license.ServerTime?.ToLocalTime().ToString("dd/MM/yyyy") ?? "—");
+        MachineIdText.Text = licenseService.GetMachineId();
+    }
+
+    private static (string Icon, string Title, string Subtitle, Color Color, Color BgColor) ResolveStyle(LicenseValidationResponse l)
+    {
+        var until = l.DownloadEntitlementUntil;
+        if (l.Status == "valid")
+        {
+            if (until is { } u && (u - DateTime.UtcNow).TotalDays < 30)
+                return ("⏰", "License valide", $"Expire bientôt — le {u.ToLocalTime():dd/MM/yyyy}",
+                    Color.FromRgb(0xF5, 0x9E, 0x0B), Color.FromRgb(0x3A, 0x2A, 0x0E));
+            return ("✓", "License valide", "Téléchargements de nouvelles versions autorisés",
+                Color.FromRgb(0x16, 0xA3, 0x4A), Color.FromRgb(0x0E, 0x2A, 0x1B));
+        }
+        if (l.Status == "expired")
+            return ("⚠", "License expirée",
+                until is { } u ? $"Expirée le {u.ToLocalTime():dd/MM/yyyy}" : "Plus de téléchargements possibles",
+                Color.FromRgb(0xEF, 0x44, 0x44), Color.FromRgb(0x2A, 0x14, 0x14));
+        if (l.Status == "revoked")
+            return ("🚫", "License révoquée", "Contacte ASTERION pour plus d'informations",
+                Color.FromRgb(0xEF, 0x44, 0x44), Color.FromRgb(0x2A, 0x14, 0x14));
+        return ("❓", "License inconnue", l.Message ?? l.Status,
+            Color.FromRgb(0xEF, 0x44, 0x44), Color.FromRgb(0x2A, 0x14, 0x14));
+    }
+
+    private void OnCopyMachineId(object sender, RoutedEventArgs e)
+    {
+        try { Clipboard.SetText(MachineIdText.Text); } catch { /* ignore */ }
+    }
+
+    private void OnDeactivate(object sender, RoutedEventArgs e)
+    {
+        var confirm = MessageBox.Show(
+            "Désactiver la license sur cette machine ?\n\n" +
+            "Tu pourras la réactiver plus tard avec ta clé. " +
+            "Les versions déjà installées restent utilisables.",
+            "Confirmer la désactivation",
+            MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.No);
+        if (confirm != MessageBoxResult.Yes) return;
+        _licenseService.Clear();
+        DeactivateRequested = true;
+        DialogResult = true;
+        Close();
+    }
+
+    private void OnClose(object sender, RoutedEventArgs e)
+    {
+        DialogResult = false;
+        Close();
+    }
+}