Admin menu rework: filters, search, cleaner rows

- Fixed-size admin window with equal-width tabs
- VEHICLE: part search, PROBLEMS/category chips, collapsible fluids grid,
  one-line rows with state pill and wear bar
- LOOSE state derived from actual tightness (DB "Bolted" lags behind)
- ITEMS: search field and grid
- Console and admin menu are mutually exclusive (console stole clicks)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

VehicleAdmin.cs

@@ -75,7 +75,7 @@ namespace MSCO
                 var part = new Part
                 {
                     Name = Pretty(t.name),
-                    Category = category.Replace("Database", ""),
+                    Category = category.Replace("Database", "").Replace("Parts", ""),
                     Damaged = damaged, Installed = installed, Wear = wear,
                     Bolted = fsm.FsmVariables.FindFsmBool("Bolted"),
                 };