Task 03: Add disk capacity and progress card

Acceptance

GET /api/v1/system/storage/disk measures the filesystem containing Kandev's storage root and returns total, used, available, percentage, path, and availability/error fields.
The disk request is independent from the cached overview and remains responsive while the overview scan is held or cold.
The Storage page shows localized used percentage, used/available/total sizes, and an accessible progress bar with warning styling at 80% and critical styling at 90%.
A capacity failure renders an unavailable card and does not block policy, history, quarantine, or overview sections.
Desktop and mobile layouts remain usable without horizontal overflow.

Verification

cd apps/backend && go test -race ./internal/system/metrics ./internal/system/storage ./internal/backendapp
cd apps/web && pnpm run typecheck
cd apps/web && pnpm test -- --run components/settings/system/storage/storage-disk-capacity-card.test.tsx

The implementation must reuse or factor the existing cross-platform disk-free-space semantics in apps/backend/internal/system/metrics; do not add a Unix-only storage API.

Files likely touched

apps/backend/internal/system/metrics/disk_unix.go
apps/backend/internal/system/metrics/disk_windows.go
apps/backend/internal/system/metrics/*_test.go
apps/backend/internal/system/storage/handler.go
apps/backend/internal/system/storage/types.go
apps/backend/internal/backendapp/storage_maintenance.go
apps/backend/internal/system/storage/handler_test.go
apps/web/lib/api/domains/system-api.ts
apps/web/lib/types/system.ts
apps/web/hooks/domains/system/use-storage-maintenance.ts
apps/web/components/settings/system/storage/storage-disk-capacity-card.tsx
Storage API/component fixtures and tests
localized system translation resources

Dependencies

None. The card is intentionally independent of Task 01's overview fan-out.

Inputs

Spec: filesystem capacity indicator, API surface, and failure scenarios
Existing apps/backend/internal/system/metrics/disk_unix.go and disk_windows.go
Existing progressive-loading request orchestration in use-storage-maintenance.ts
Existing formatGigabytes and localized Storage card patterns

Output contract

Return a compact handoff capsule with API/test results, desktop/mobile evidence, exact percentage semantics, and any platform-specific capacity limitations.

Result

Added the cross-platform GET /api/v1/system/storage/disk endpoint and an independently loaded capacity card. Unix statfs and Windows GetDiskFreeSpaceEx expose total, service-available, used, and clamped percentage values. The UI renders the exact percentage and byte-derived sizes, with accessible progress semantics plus 80%/90% warning styling; unavailable reads remain non-blocking. Backend metrics/storage tests, web typecheck/lint, focused component tests, and the desktop/mobile managed Storage E2E flows pass.

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