Redesign login UI, add theme toggle, refactor user update

- Redesigned login page with two-panel layout and branding
- Added HexaDistro logo and theme toggle to sidebar/header
- Refactored user update: roles via update endpoint, removed assignRole API/controller
- Extended UpdateUserRequest for username, role, password changes
- UserService.UpdateAsync syncs changes with AuthHex, with rollback
- Stock balances client dedupes by itemId-locationId
- Middleware matcher excludes static assets from auth checks
- Improved localStorage clearing for user context
- Added lucide-react for icons
- Minor UI/code cleanups for consistency and UX

distribution_fe/app/(dashboard)/stock/_components/stock-balances-client.tsx

@@ -45,7 +45,15 @@ export function StockBalancesClient() {
     setLoading(true)
     try {
       const res = await stockApi.balances({ page: p, pageSize: ps })
-      setData(getPaginatedItems(res))
+      const items = getPaginatedItems(res)
+      const seen = new Set<string>()
+      const deduped = items.filter(r => {
+        const k = `${r.itemId}-${r.locationId}`
+        if (seen.has(k)) return false
+        seen.add(k)
+        return true
+      })
+      setData(deduped)
       setTotal(res.total)
     } catch (err) {
       toast.add({ title: 'Failed to load stock balances', description: getApiError(err), type: 'error' })