fix(web): keep guest filesystem mount paths readable

Render complete wrapping paths above usage using an opt-in shared detail-row layout. Preserve compact rows and unknown-usage semantics. Include the typed regression fixture, registered primitive and Workloads guardrails, substantive owning contracts and the content-bound five-layout browser receipt in the same candidate commit. Recompose the rejected unshared candidate without changing its browser-tested runtime bytes. Addresses #2121.

Change-source: pulse-maintainer

docs/release-control/v6/internal/subsystems/frontend-primitives.md

@@ -4856,6 +4856,13 @@ row closes the panel instead of presenting a separate text button; consumers
 may own the platform-specific section data, but they must not recreate local
 `DetailField` grids or route platform-neutral detail tables through a
 provider-named primitive.
+Long identifying labels can opt into `DetailRow.layout: 'stacked'`: the shared
+renderer places the complete label above its value and progress bar in one
+full-width cell on both narrow and desktop layouts. The label wraps even an
+unbroken path segment rather than inheriting table nowrap/ellipsis; it must be
+readable without hover or horizontal scrolling. Compact two-cell rows remain
+the default. This is a presentation choice only: value formatting, unknown
+usage, tone and accessible progress metadata retain their existing semantics.
 Platform row-detail disclosure controls are also registry-backed templates.
 `frontend-modern/src/features/platformPage/PlatformResourceDetailTableRow.tsx`
 owns `PlatformResourceDetailToggleButton`, which composes

docs/release-control/v6/internal/subsystems/performance-and-scalability.md

@@ -2301,6 +2301,13 @@ Within that compact technical layout, `GuestDrawerOverview.tsx` declares the
 panel and keeps the short tag list in the narrower slot. Future section-order
 changes in that overview must preserve the filesystem-first ordering rather
 than letting the shorter tag list take the wide column.
+Panel width alone does not make mount paths readable. Filesystem disk rows must
+opt into the shared `layout: 'stacked'` presentation so their full mount path
+wraps above usage and progress at desktop and phone widths. Shared-prefix paths
+must remain distinguishable without hover. Workloads supplies this row metadata,
+not local table CSS or a duplicate renderer; non-filesystem rows keep the compact
+default. Verification covers the opt-in at this composition boundary and actual
+long-path wrapping in the shared renderer's browser proof.
 Guest, node, and Docker-host drawer headers follow the same frontend-primitives dependency
 boundary for collapse: Workloads owns which inline row is selected and the
 close handler, while

frontend-modern/browser-verification.json

@@ -1,40 +1,54 @@
 {
   "version": 1,
-  "base_sha": "014190ea4c630397e13088e3888bffb93012b8f3",
-  "verified_at": "2026-09-22T11:10:32.326040Z",
+  "base_sha": "cc1dca44d0dfd6b85eefa0c4b5fd0593cb0bcb8d",
+  "verified_at": "2026-09-22T13:31:09.864671Z",
   "result": "passed",
   "changed_paths": [
-    "frontend-modern/src/features/proxmox/ProxmoxBackupServersTable.tsx"
+    "frontend-modern/src/components/Workloads/GuestDrawerOverview.tsx",
+    "frontend-modern/src/components/shared/DetailSectionTable.tsx",
+    "frontend-modern/src/components/shared/detailSectionModel.ts"
   ],
   "content_sha256": {
-    "frontend-modern/src/features/proxmox/ProxmoxBackupServersTable.tsx": "b463452e00e796a0d9ff3639f21ff7ac0d7219539cfacf50f6101282d829f78a"
+    "frontend-modern/src/components/Workloads/GuestDrawerOverview.tsx": "713c26cde7852d7499138684a142e623b99f591d6b1f60c5eb639efef25376ff",
+    "frontend-modern/src/components/shared/DetailSectionTable.tsx": "f14935b93d3062e22215f55dcf8725589265b69a60a03dae10949b374a1e2cb8",
+    "frontend-modern/src/components/shared/detailSectionModel.ts": "0669d3afc5bc3d0809c3c2ee4204913c28aa87703c218ee3110b626e5792d086"
   },
   "routes": [
-    "/proxmox/backups (production component fixture)",
-    "/browser-tests/pbs-host-history-correlation.html"
+    "GuestDrawerOverview production-component fixture /proof.html"
   ],
   "viewports": [
+    {
+      "width": 1600,
+      "height": 1100
+    },
     {
       "width": 1280,
-      "height": 900
+      "height": 1100
+    },
+    {
+      "width": 768,
+      "height": 1100
     },
     {
       "width": 390,
-      "height": 844
+      "height": 1100
+    },
+    {
+      "width": 320,
+      "height": 1100
     }
   ],
   "states": [
-    "Two datastores on one PBS, with a single agent represented by guest and standalone rows",
-    "History on tank, archive, then tank again, with populated synthetic CPU/memory/disk/network history",
-    "Fresh resource snapshots with changing usage and alternating datastore array order"
+    "Guest with System, Memory, Filesystems and Tags sections",
+    "Shared-prefix mount paths ending in Films and Series",
+    "Long path with spaces and 140-character unbroken path segment",
+    "1280px desktop with a constrained 650px pane; tablet/phone touch emulation"
   ],
   "interactions": [
-    "Keyboard-expand each datastore row and select History",
-    "Check both datastore identities before each switch",
-    "Refresh three snapshots at each viewport; assert updated usage, retained drawer DOM, selected History tab and seven chart paths",
-    "Assert all six history requests use vm/proxmox:100, never the PBS service target",
-    "Inspect desktop and mobile screenshots; no uncaught page errors"
+    "Read all paths without hovering or scrolling horizontally",
+    "Assert text ranges fit all five label boxes at all five layouts, no page overflow or uncaught errors, and five progress bars",
+    "Inspect before/after desktop, constrained desktop and smallest-phone screenshots"
   ],
-  "command": "pulse-worker-browser .pbs-proof/check.cjs (assigned workspace root; invokes scripts/check-pbs-host-history-correlation.cjs in the disposable source copy)",
-  "notes": "Chromium 141.0.7390.37 / installed Playwright 1.56.1. Production source SHA-256 matched the assigned tree; package-lock SHA-256 87e579d28080ad1fb42992dd5b398c373aa08aff63bbf3f0ed63ac8b4a8f89a0, matching offline dependency snapshot dac6a9b347a1c76ad3bf0f5eadc17b84d468ce0d3878354e5d39e745101ccb53. Before the fix, a reversed datastore array overwrote the archive row to tank, reproduced in Chromium and the new component test. Isolating the row datastore object corrects it. Synthetic metrics/capability/AI responses, not live backend or reporter data. History reset to Summary was not reproduced, and this is not whole-issue resolution. Final screenshots visually inspected. Logs retained in web-product-h8pgc3la/pbs-browser-final.log; disposable copy retained in that output directory."
+  "command": "pulse-worker-browser .proof-filesystems/after.cjs",
+  "notes": "Chromium 141.0.7390.37 / Playwright 1.56.1. Synthetic guest, real GuestDrawerOverview, shared renderer and application CSS. Before repair, desktop labels are 112px with ellipsis; after repair complete paths wrap above usage. No live backend, published-build qualification or reporter confirmation. Other detail rows retain their compact layout."
 }

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

@@ -197,6 +197,7 @@ export function GuestDrawerOverview(props: GuestDrawerOverviewProps) {
                     .join(' · '),
                   {
                     title: disk.labelTitle,
+                    layout: 'stacked',
                     wrap: true,
                     progress:
                       disk.progressValue === null

frontend-modern/src/components/Workloads/__tests__/GuestDrawerOverview.filesystems.test.tsx

@@ -0,0 +1,78 @@
+import { cleanup, render, screen } from '@solidjs/testing-library';
+import type { ComponentProps } from 'solid-js';
+import { afterEach, describe, expect, it } from 'vitest';
+import { GuestDrawerOverview } from '../GuestDrawerOverview';
+
+const paths = ['/mnt/Plex/Media/Animation/Films', '/mnt/Plex/Media/Animation/Series'];
+const props: ComponentProps<typeof GuestDrawerOverview> = {
+  guest: {
+    id: 'guest-101',
+    name: 'media',
+    vmid: 101,
+    type: 'lxc',
+    status: 'running',
+    cpus: 4,
+    node: 'pve-a',
+    instance: 'lab',
+    cpu: 0,
+    disk: { total: 10 * 1024 ** 3, used: 5 * 1024 ** 3, usage: 50 },
+    networkIn: 0,
+    networkOut: 0,
+    diskRead: 0,
+    diskWrite: 0,
+    uptime: 3600,
+    template: false,
+    lastBackup: 0,
+    tags: ['media'],
+    lock: '',
+    lastSeen: '2026-09-22T13:00:00Z',
+    memory: { total: 8 * 1024 ** 3, used: 2 * 1024 ** 3, free: 6 * 1024 ** 3, usage: 25 },
+    disks: paths.map((mountpoint, index) => ({
+      mountpoint,
+      type: `mp${index}`,
+      total: 10 * 1024 ** 3,
+      used: 5 * 1024 ** 3,
+      usage: index === 0 ? 50 : -1,
+    })),
+  },
+  guestOsSummary: 'Debian 13',
+  agentHeading: 'Agent',
+  agentLabel: 'Connected',
+  agentTitle: 'Connected',
+  hasAgentInfo: true,
+  hasFilesystemDetails: true,
+  hasNetworkInterfaces: false,
+  hasOsInfo: true,
+  hasWorkloadActionAgent: false,
+  showInGuestAgentInstallCue: false,
+  ipAddresses: ['192.0.2.1'],
+  networkInterfaces: [],
+  normalizedTags: ['media'],
+  backupPresentation: null,
+  workloadActionAgentTitle: '',
+};
+
+describe('GuestDrawerOverview filesystem labels', () => {
+  afterEach(cleanup);
+
+  it('shows shared-prefix paths above usage, including unknown usage, without relying on hover', () => {
+    render(() => <GuestDrawerOverview {...props} />);
+    for (const path of paths) {
+      const label = screen.getByText(path);
+      expect(label.tagName).toBe('SPAN');
+      expect(label).toHaveClass('whitespace-normal', '[overflow-wrap:anywhere]');
+      expect(label.closest('td')).toHaveAttribute('colspan', '2');
+    }
+    expect(
+      screen.getByRole('progressbar', { name: `Filesystem ${paths[0]} utilization` }),
+    ).toHaveAttribute('aria-valuenow', '50');
+    expect(
+      screen.queryByRole('progressbar', { name: `Filesystem ${paths[1]} utilization` }),
+    ).toBeNull();
+    expect(screen.getByText(/— · \?\/10.0 GB · MP1/)).toBeInTheDocument();
+    expect(screen.getByText('CPUs').closest('tr')).toHaveClass('lg:grid-cols-[7rem_minmax(0,1fr)]');
+    expect(screen.getByText('Values').closest('tr')).toHaveClass(
+      'lg:grid-cols-[7rem_minmax(0,1fr)]',
+    );
+  });
+});

frontend-modern/src/components/Workloads/__tests__/WorkloadsSurface.performance.contract.test.tsx

@@ -1653,6 +1653,16 @@ describe('Workloads performance contract', () => {
       expect(filesystemsSectionIndex).toBeGreaterThan(-1);
       expect(tagsSectionIndex).toBeGreaterThan(-1);
       expect(filesystemsSectionIndex).toBeLessThan(tagsSectionIndex);
+      // Ordering cannot prevent the compact label column from clipping paths.
+      // Filesystem rows delegate full-path presentation to the shared renderer.
+      const filesystemSectionSource = guestDrawerOverviewSource.slice(
+        filesystemsSectionIndex,
+        tagsSectionIndex,
+      );
+      expect(filesystemSectionSource).toContain("layout: 'stacked'");
+      expect(filesystemSectionSource).toContain('wrap: true');
+      expect(guestDrawerOverviewSource.match(/layout: 'stacked'/g)).toHaveLength(1);
+
       expect(guestDrawerOverviewSource).toContain('TechnicalDetailsSection');
       expect(nodeDrawerOverviewSource).toContain('TechnicalDetailsSection');
       const retiredInfoCardFrameClass = [

frontend-modern/src/components/shared/DetailSectionTable.tsx

@@ -90,16 +90,26 @@ export const DetailSectionTable: Component<{
             </TableRow>
             <For each={section.rows}>
               {(row) => (
-                <TableRow class="lg:grid lg:min-w-0 lg:grid-cols-[7rem_minmax(0,1fr)] lg:items-start lg:gap-3 lg:py-0.5 lg:hover:bg-transparent">
-                  <TableCell class="w-[38%] px-2 py-1 align-top text-muted lg:w-auto lg:px-0 lg:py-0">
-                    {row.label}
-                  </TableCell>
+                <TableRow
+                  class={`lg:grid lg:min-w-0 lg:items-start lg:gap-3 lg:py-0.5 lg:hover:bg-transparent ${row.layout === 'stacked' ? 'lg:grid-cols-[minmax(0,1fr)]' : 'lg:grid-cols-[7rem_minmax(0,1fr)]'}`}
+                >
+                  {row.layout !== 'stacked' ? (
+                    <TableCell class="w-[38%] px-2 py-1 align-top text-muted lg:w-auto lg:px-0 lg:py-0">
+                      {row.label}
+                    </TableCell>
+                  ) : null}
                   <TableCell
+                    colspan={row.layout === 'stacked' ? 2 : undefined}
                     class={`px-2 py-1 text-right align-top font-medium lg:min-w-0 lg:px-0 lg:py-0 lg:text-left ${detailValueToneClass(
                       row.tone,
                     )} ${row.valueClass ?? ''}`}
                     title={row.title ?? row.value}
                   >
+                    {row.layout === 'stacked' ? (
+                      <span class="mb-1 block whitespace-normal text-left font-normal leading-snug text-muted [overflow-wrap:anywhere]">
+                        {row.label}
+                      </span>
+                    ) : null}
                     {row.valueContent ?? (
                       <span
                         title={row.title ?? row.value}

frontend-modern/src/components/shared/SharedPrimitives.guardrails.test.ts

@@ -8006,6 +8006,16 @@ describe('shared primitive guardrails', () => {
     expect(detailSectionTableSource).toContain('lg:flex-none');
     expect(detailSectionTableSource).not.toContain('lg:flex-1');
     expect(detailSectionTableSource).toContain('lg:grid-cols-[7rem_minmax(0,1fr)]');
+    // Long identifiers opt into the shared full-width row; compact rows keep
+    // their original track and the table-wide truncation policy is untouched.
+    expect(detailSectionModelSource).toContain("layout?: 'stacked'");
+    expect(detailSectionTableSource).toContain("row.layout !== 'stacked'");
+    expect(detailSectionTableSource).toContain(
+      "colspan={row.layout === 'stacked' ? 2 : undefined}",
+    );
+    expect(detailSectionTableSource).toContain('lg:grid-cols-[minmax(0,1fr)]');
+    expect(detailSectionTableSource).toContain('[overflow-wrap:anywhere]');
+
     expect(detailSectionTableSource).toContain('lg:text-left');
     expect(detailSectionTableSource).toContain('lg:divide-y-0');
     expect(detailSectionModelSource).toContain('footerContent?: JSX.Element');

frontend-modern/src/components/shared/__tests__/DetailSectionTable.test.tsx

@@ -185,6 +185,34 @@ describe('DetailSectionTable', () => {
     expect(fill?.firstElementChild).toHaveClass('bg-emerald-500');
   });
 
+  it('opts long identifying labels into full-width wrapping rows without changing compact rows', () => {
+    const path = '/mnt/media/animation/series';
+    render(() => (
+      <DetailSectionTable
+        sections={[
+          {
+            label: 'Filesystems',
+            rows: compactDetailRows([
+              makeDetailRow(path, '50% · 5 GB/10 GB', { layout: 'stacked', wrap: true }),
+              makeDetailRow('Status', 'Available'),
+            ]),
+          },
+        ]}
+      />
+    ));
+
+    const label = screen.getByText(path);
+    expect(label).toHaveClass('whitespace-normal', '[overflow-wrap:anywhere]', 'text-left');
+    expect(label.closest('td')).toHaveAttribute('colspan', '2');
+    expect(label.closest('tr')?.querySelectorAll('td')).toHaveLength(1);
+    expect(label.closest('tr')).toHaveClass('lg:grid-cols-[minmax(0,1fr)]');
+    expect(screen.getByText('50% · 5 GB/10 GB').closest('td')).toBe(label.closest('td'));
+    expect(screen.getByText('Status').closest('tr')).toHaveClass(
+      'lg:grid-cols-[7rem_minmax(0,1fr)]',
+    );
+    expect(screen.getByText('Status').closest('tr')?.querySelectorAll('td')).toHaveLength(2);
+  });
+
   it('fills five desktop sections on the same three-column tracks', () => {
     const { container } = render(() => (
       <DetailSectionTable

frontend-modern/src/components/shared/detailSectionModel.ts

@@ -17,6 +17,8 @@ export type DetailRow = {
   title?: string;
   tone?: DetailValueTone;
   wrap?: boolean;
+  /** Put long identifying labels above the value instead of in the compact label column. */
+  layout?: 'stacked';
   progress?: DetailRowProgress;
 };
 
@@ -32,7 +34,7 @@ export const makeDetailRow = (
   value?: string | null,
   options: Pick<
     DetailRow,
-    'title' | 'tone' | 'wrap' | 'progress' | 'valueContent' | 'valueClass'
+    'title' | 'tone' | 'wrap' | 'layout' | 'progress' | 'valueContent' | 'valueClass'
   > = {},
 ): DetailRow | null => {
   const trimmed = value?.trim();