Implement automatic page scaling feature with viewport adjustments

chromium-setup/emmc-provisioning/dashboard/README.md

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+# CM4 Provisioning Dashboard
+
+Flask web UI to monitor the eMMC deployment process and show device connection steps.
+
+- **Connection steps**: Numbered instructions for putting the reTerminal in boot mode and connecting it.
+- **Live status**: Idle / Connecting (rpiboot) / Flashing / Backup / Done / Error, with optional progress.
+- **Backup / Restore**: Toggle between **Flash** (deploy golden image) and **Backup** (save eMMC to a timestamped file when device is connected in boot mode). List and download saved backups.
+- **Recent log**: Tail of the flash log (from the host, via the shared bind mount).
+
+The dashboard reads `/var/lib/cm4-provisioning/status.json` and `flash.log`, which the flash script (running on the Proxmox host) updates. When the dashboard runs inside the LXC, that directory is bind-mounted from the host, so it sees the same files.
+
+## Run locally (development)
+
+```bash
+cd dashboard
+pip install flask  # or use venv
+python3 app.py
+# Open http://localhost:5000
+```
+
+## Run in LXC (Proxmox)
+
+1. Copy the dashboard into the container (e.g. to `/opt/cm4-provisioning/dashboard`).
+2. Install Flask if needed: `apt install -y python3-flask` or `pip install flask`.
+3. Install the systemd unit and enable it:
+
+```bash
+cp /opt/cm4-provisioning/dashboard/cm4-dashboard.service /etc/systemd/system/
+systemctl daemon-reload
+systemctl enable --now cm4-dashboard
+```
+
+4. Open `http://<LXC-IP>:5000` (or port-forward from the Proxmox host).
+
+## Environment (optional)
+
+- `CM4_STATUS_FILE` – path to status JSON (default: `/var/lib/cm4-provisioning/status.json`).
+- `CM4_LOG_FILE` – path to flash log (default: `/var/lib/cm4-provisioning/flash.log`).