v0.128.1: suppress the class hint on USB drives (ruling F5)

Only Observe-sourced drives ever carried class, so legacy PVE dir:-backed USB
drives showed 'lassú' while registry-sourced ones never did. The card already
carries the USB type tag. Hub-report ClassHint UNCHANGED (UI-only). Pinned by
TestStorageTemplate_USBClassBadgeSuppressed (red-proof run).

controller/internal/web/templates/storage.html

@@ -250,6 +250,10 @@ window.__registeredPaths=[{{range .StoragePaths}}{{if .Path}}"{{.Path}}",{{end}}
   function usageColorClass(p){ if(p>=85) return 'crit'; if(p>=70) return 'warn'; return 'nominal'; }
   var LOCK_ICO='<svg class="ico ico-sm"><use href="#i-lock"/></svg>';
   function classTag(d){
+    // F5 2026-07-13: USB drives never show the class hint — the card already carries the USB
+    // tag, and Observe-sourced USB drives showing "lassú" while registry-sourced ones never do
+    // was a misleading inconsistency. Hub-report ClassHint is UNCHANGED (UI-only suppression).
+    if(d.type==='usb') return '';
     if(d.class==='fast') return '<span class="tag">gyors</span>';
     if(d.class==='slow') return '<span class="tag tag-off">lassú</span>';
     return '';