Mute the workload history hover hint

The one-time "Hover a guest to preview history" tip in the guest
toolbar had no colour class, so it rendered in body-text white while
every control around it (View, Add filter, the History label) is muted
slate. A passive tip outshone the controls and read as a stray label.
It now uses the muted token, so it reads as a caption for the History
range control it explains. Reveal, clear-on-hover and phone hiding are
unchanged.

The README workspace capture and social preview are refreshed from
the same build so they show the muted hint.

Contract-Neutral: Hint colour token only; no change to what the workloads toolbar shows or when

frontend-modern/browser-verification/61476fff0b371544.json

@@ -0,0 +1,36 @@
+{
+  "version": 1,
+  "base_sha": "79709eea0fdc9262437bb7b31deddd1f6c24ba19",
+  "verified_at": "2026-10-22T09:23:38Z",
+  "result": "passed",
+  "changed_paths": [
+    "frontend-modern/src/components/Workloads/WorkloadsFilter.tsx"
+  ],
+  "content_sha256": {
+    "frontend-modern/src/components/Workloads/WorkloadsFilter.tsx": "0d81265e207264a848b490c5a3b0c7ee49607aff2c49397c45a6504c2af48cac"
+  },
+  "routes": [
+    "/proxmox/overview"
+  ],
+  "viewports": [
+    {
+      "width": 1280,
+      "height": 800
+    },
+    {
+      "width": 390,
+      "height": 844
+    }
+  ],
+  "states": [
+    "mock demo estate (8 nodes, 77 guests), bars mode, history hover, first visit: hint shown in the muted control tone (rgb 148,163,184, same as the View button) beside the History range control",
+    "after the first populated row preview: hint hidden with its box kept, toolbar and table unchanged",
+    "after reload once the hint was seen: hint not rendered",
+    "390px phone width: hint not rendered"
+  ],
+  "interactions": [
+    "hovered a guest row to open the history preview and clear the hint",
+    "reloaded the overview to confirm the seen hint stays gone",
+    "compared computed colours of the hint and the View button at 1280px"
+  ]
+}

frontend-modern/src/components/Workloads/WorkloadsFilter.tsx

@@ -455,7 +455,7 @@ export const WorkloadsFilter: Component<WorkloadsFilterProps> = (props) => {
           <div class="flex items-center gap-2">
             <Show when={historyHintSlotReserved()}>
               <span
-                class={`hidden whitespace-nowrap text-[11px] lg:inline ${
+                class={`hidden whitespace-nowrap text-[11px] text-muted lg:inline ${
                   props.metricHistoryHintVisible?.() ? '' : 'invisible'
                 }`.trim()}
                 data-testid="workload-history-hover-hint"

frontend-modern/src/components/Workloads/__tests__/WorkloadsFilter.test.tsx

@@ -313,9 +313,10 @@ describe('WorkloadsFilter', () => {
         />
       ));
 
-      expect(screen.getByTestId('workload-history-hover-hint')).toHaveTextContent(
-        'Hover a guest to preview history',
-      );
+      const hint = screen.getByTestId('workload-history-hover-hint');
+      expect(hint).toHaveTextContent('Hover a guest to preview history');
+      // A passive tip reads below the toolbar's controls, not brighter than them.
+      expect(hint).toHaveClass('text-muted');
       unmount();
 
       render(() => (