Add dashboard UI updates and settings modal

flash_sd.sh

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+#!/bin/bash
+set -euo pipefail
+
+# Pi-Kit flashing helper (small wrapper around xzcat | dd).
+# Usage: sudo ./flash_sd.sh /path/to/image.img.xz /dev/sdX
+# Example: sudo ./flash_sd.sh images/output/DietPi_RPi5-ARMv8-Trixie-base.img.xz /dev/sdb
+# Safety guardrails:
+#   - Requires root (sudo).
+#   - WILL wipe the target block device; prompt asks for YES before writing.
+#   - If a .sha256 sits next to the image, consider verifying it first.
+
+img="${1:-}"
+dev="${2:-}"
+
+if [[ -z "$img" || -z "$dev" ]]; then
+  echo "Usage: sudo $0 image.img.xz /dev/sdX"
+  exit 1
+fi
+
+if [[ $EUID -ne 0 ]]; then
+  echo "Please run as root (sudo)."
+  exit 1
+fi
+
+if [[ ! -b "$dev" ]]; then
+  echo "Device $dev not found or not a block device."
+  exit 1
+fi
+
+echo "About to wipe and flash $dev with $img"
+read -rp "Type YES to continue: " yn
+[[ "$yn" == "YES" ]] || { echo "Aborted."; exit 1; }
+
+echo "Decompressing and writing... this may take several minutes."
+xzcat "$img" | pv | dd of="$dev" bs=4M conv=fsync status=none
+
+echo "Syncing..."
+sync
+
+echo "Flashed $img to $dev successfully."
+
+echo "Ejecting $dev..."
+sudo eject "$dev" || true