Add report logos and configurable folder scan depth

Report branding (top-left MSP logo, top-right client logo):
- Add MspLogo to AppSettings; client logo already on TenantProfile
- IUserSessionService.CurrentBranding composes MSP + active profile logo
- New reusable LogoUpload component (InputFile -> base64 LogoData, 512KB cap)
- MSP logo upload in Settings; optional client logo in profile create/edit
- Wire ReportBranding into all 6 HTML export pages
- Fix EditProfile dropping ClientLogo on edit

Storage metrics: expose folder scan depth (0-20) in scan options UI,
passed to existing StorageScanOptions.FolderDepth recursion.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Components/Pages/Settings.razor

@@ -35,11 +35,21 @@
     </div>
 </div>
 
+<div class="card">
+    <div class="card-title">Report Branding</div>
+    <div class="form-group">
+        <label class="form-label">MSP logo</label>
+        <p class="text-muted" style="margin-top:0">Shown top-left on exported HTML reports. The client's logo (top-right) is set per profile.</p>
+        <LogoUpload Value="_mspLogo" ValueChanged="OnMspLogoChanged" />
+    </div>
+</div>
+
 @if (_saved) { <div class="alert alert-success">Settings saved.</div> }
 
 @code {
     private string _lang = "en", _theme = "System";
     private bool _autoTakeOwnership, _saved;
+    private LogoData? _mspLogo;
 
     protected override void OnInitialized()
     {
@@ -47,11 +57,18 @@
         _lang = s.Lang;
         _theme = s.Theme is "System" or "Light" ? s.Theme : "System";
         _autoTakeOwnership = s.AutoTakeOwnership;
+        _mspLogo = s.MspLogo;
+    }
+
+    private async Task OnMspLogoChanged(LogoData? logo)
+    {
+        _mspLogo = logo;
+        await Save();
     }
 
     private async Task Save()
     {
-        Session.UpdateSettings(new AppSettings { Lang = _lang, Theme = _theme, AutoTakeOwnership = _autoTakeOwnership });
+        Session.UpdateSettings(new AppSettings { Lang = _lang, Theme = _theme, AutoTakeOwnership = _autoTakeOwnership, MspLogo = _mspLogo });
         SharepointToolbox.Web.Localization.TranslationSource.Instance.SetCulture(_lang);
         await JS.InvokeVoidAsync("sptb.setTheme", _theme);
         _saved = true;