feat(source2): lock dark mode, sans-serif typography, and all recent updates

docs/log/2026-07-27-1525-localhost-labeling.md

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+# Iteration Log: 2026-07-27-1525 (Device Labeling Page on Localhost)
+
+## Request & Scope
+* **Request**: Implement the "Device Labeling" management tab locally first (localhost). This tab allows administrators to manage and label captured MAC addresses.
+* **Scope**: Express Backend endpoints, Sidebar navigation, Next.js page component, local MongoDB query logic, and compiler validation.
+* **Deployment Policy**: STRICTLY LOCAL ONLY (fokus localhost; no deploy to production).
+
+---
+
+## Steps Taken
+
+1. **Backend Route Design**:
+   * Modified [backend/routes/dashboard/devices.js](file:///c:/Users/demo/Downloads/Deep%20Package%20Inspection/backend/routes/dashboard/devices.js) to add `GET /api/dashboard/devices/labeling`.
+   * Programmed role-based security (`SUPER_ADMIN` / `TENANT_ADMIN`) and tenant data isolation filtering by `site_uuid`.
+   * Programmed aggregation grouping on `DeviceStat` with a automatic fallback to the raw `Flow` collection if device statistics are empty.
+   * Integrated lookup joins with `CustomDeviceLabel` to return custom labels.
+
+2. **Sidebar Registration**:
+   * Registered `Device Labeling` with the `Tag` icon in [src/components/layout/SidebarData.ts](file:///c:/Users/demo/Downloads/Deep%20Package%20Inspection/src/components/layout/SidebarData.ts).
+   * Hidden the menu item for non-admin roles in [src/components/layout/Sidebar.tsx](file:///c:/Users/demo/Downloads/Deep%20Package%20Inspection/src/components/layout/Sidebar.tsx).
+
+3. **Page Component Creation**:
+   * Created Next.js client component page [src/app/(dashboard)/device-labeling/page.tsx](file:///c:/Users/demo/Downloads/Deep%20Package%20Inspection/src/app/(dashboard)/device-labeling/page.tsx) with a responsive `DataTable`, modal forms, and updates submitting to `/api/dashboard/devices/update-label`.
+
+4. **Verification**:
+   * Verified database queries using a local scratch script: `verify-local-labeling.js` successfully executed and resolved 85 records from the local MongoDB database.
+   * Compiled Next.js locally using `npm run build`: built cleanly with no TypeScript compiler errors.
+   * Checked health status of local backend server at `http://127.0.0.1:3001/api/health` and verified it is active.
+
+---
+
+## Outcome
+* **Local Codebase State**: Completely implemented and functional on localhost.
+* **Production State**: Untouched (demoplace domain is unchanged).
+* **Open Risks / Issues**: The browser subagent encountered an environment Playwright download issue (Azure CDN returned 404 for driver installation), which prevented automated browser screenshot testing.