Add comprehensive CV verification checks and dashboard auto-refresh

- Add dashboard auto-refresh polling to update when processing completes
- Skip verification for freelance employers (but not contractors)
- Add incorporation date check (flags employment before company existed)
- Add dissolution date check (flags employment at dissolved companies)
- Add dormant company check (flags non-director roles at dormant companies)
- Add company size vs role check (flags senior roles at micro-entities)
- Add SIC code mismatch check (flags tech roles at non-tech companies)
- Add director verification against Companies House officers
- Add rapid career progression detection (3+ seniority jumps in <2 years)
- Add early career senior role detection (<2 years after education)
- Extend CompanyVerificationResult with flags and company data
- Add officers endpoint to Companies House client
- Fix null reference warning in Report.razor

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/TrueCV.Web/Components/Pages/Dashboard.razor

@@ -1,6 +1,7 @@
 @page "/dashboard"
 @attribute [Authorize]
 @rendermode InteractiveServer
+@implements IDisposable
 
 @inject ICVCheckService CVCheckService
 @inject NavigationManager NavigationManager
@@ -250,10 +251,54 @@
     private bool _isExporting;
     private string? _errorMessage;
     private Guid _userId;
+    private System.Threading.Timer? _pollingTimer;
+    private bool _isPolling;
 
     protected override async Task OnInitializedAsync()
     {
         await LoadChecks();
+        StartPollingIfNeeded();
+    }
+
+    private void StartPollingIfNeeded()
+    {
+        if (HasProcessingChecks() && !_isPolling)
+        {
+            _isPolling = true;
+            _pollingTimer = new System.Threading.Timer(async _ =>
+            {
+                await InvokeAsync(async () =>
+                {
+                    await LoadChecks();
+                    if (!HasProcessingChecks())
+                    {
+                        StopPolling();
+                    }
+                    StateHasChanged();
+                });
+            }, null, TimeSpan.FromSeconds(3), TimeSpan.FromSeconds(3));
+        }
+    }
+
+    private bool HasProcessingChecks()
+    {
+        foreach (var c in _checks)
+        {
+            if (c.Status == "Processing" || c.Status == "Pending") return true;
+        }
+        return false;
+    }
+
+    private void StopPolling()
+    {
+        _isPolling = false;
+        _pollingTimer?.Dispose();
+        _pollingTimer = null;
+    }
+
+    public void Dispose()
+    {
+        StopPolling();
     }
 
     private async Task LoadChecks()