Fix subscription expiry logic and HTML entities in page titles

Subscription expiry (SubscriptionExpiryBackgroundService):
- Trials with no grace period now go directly Active -> Expired instead
  of briefly entering GracePeriod for a day, which was causing repeated
  'Grace Period Started' admin notification emails
- Remove redundant isTrial variable (query already filters to non-Stripe
  companies, so all processed companies are trials by definition)
- Save per-company inside the loop so a single SaveChangesAsync failure
  no longer discards all other companies' status changes and notification
  log entries (which was the other cause of repeated emails)

HTML entities in page titles (33 views):
- Replace – / — with plain ' - ' in ViewData["Title"] C#
  strings; Razor HTML-encodes these when rendering @ViewData["Title"],
  causing browsers to display the literal text '–' instead of a dash

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Web/Views/Budgets/Edit.cshtml

@@ -1,8 +1,8 @@
-@using PowderCoating.Web.Controllers
+@using PowderCoating.Web.Controllers
 @model BudgetCreateVm
 
 @{
-    ViewData["Title"] = $"Edit Budget — {Model.Name}";
+    ViewData["Title"] = $"Edit Budget - {Model.Name}";
     ViewData["PageIcon"] = "bi-pencil";
     var months = new[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
 }