extra material and simulink creation script

scripts/prepare_assets.sh

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+#!/bin/bash
+# prepare_assets.sh - Prepares fonts and images for Flutter build
+# Run this before 'flutter build' to ensure assets are in place
+#
+# This script handles:
+# - DIN1451 font: symlinks from extra/ if present, otherwise downloads Noto Sans as fallback
+# - Dashboard image: symlinks from extra/ if present, otherwise skipped (handled at runtime)
+
+set -e
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+
+UI_DIR="$PROJECT_ROOT/pi/ui"
+FONTS_DIR="$UI_DIR/fonts"
+IMAGES_DIR="$UI_DIR/assets/images"
+EXTRA_FONTS="$PROJECT_ROOT/extra/fonts"
+EXTRA_IMAGES="$PROJECT_ROOT/extra/images"
+
+# Noto Sans download URLs (Google Fonts)
+NOTO_SANS_BASE="https://github.com/googlefonts/noto-fonts/raw/main/hinted/ttf/NotoSans"
+NOTO_REGULAR="$NOTO_SANS_BASE/NotoSans-Regular.ttf"
+NOTO_BOLD="$NOTO_SANS_BASE/NotoSans-Bold.ttf"
+NOTO_LIGHT="$NOTO_SANS_BASE/NotoSans-Light.ttf"
+
+echo "=== Smart Serow Asset Preparation ==="
+
+# --- FONTS ---
+echo ""
+echo "--- Fonts ---"
+
+# Ensure Noto Sans fallbacks exist
+download_noto() {
+    local weight=$1
+    local url=$2
+    local dest="$FONTS_DIR/NotoSans-${weight}.ttf"
+
+    if [ ! -f "$dest" ]; then
+        echo "Downloading Noto Sans $weight..."
+        curl -sL "$url" -o "$dest" || {
+            echo "Warning: Failed to download Noto Sans $weight"
+            return 1
+        }
+        echo "  -> Downloaded $dest"
+    else
+        echo "  Noto Sans $weight already present"
+    fi
+}
+
+download_noto "Regular" "$NOTO_REGULAR"
+download_noto "Bold" "$NOTO_BOLD"
+download_noto "Light" "$NOTO_LIGHT"
+
+# DIN1451 - symlink if available, otherwise use Noto Sans
+DIN_TARGET="$FONTS_DIR/din1451alt.ttf"
+DIN_SOURCE="$EXTRA_FONTS/din1451alt.ttf"
+
+# Remove old symlink/file to ensure fresh state
+rm -f "$DIN_TARGET"
+
+if [ -f "$DIN_SOURCE" ]; then
+    echo "DIN1451 found - linking/copying"
+    # Try symlink first, fall back to copy (Windows compatibility)
+    if ln -s "$DIN_SOURCE" "$DIN_TARGET" 2>/dev/null; then
+        echo "  -> Linked $DIN_TARGET -> $DIN_SOURCE"
+    else
+        cp "$DIN_SOURCE" "$DIN_TARGET"
+        echo "  -> Copied $DIN_TARGET (symlinks not supported)"
+    fi
+else
+    echo "DIN1451 not found - using Noto Sans as fallback"
+    if [ -f "$FONTS_DIR/NotoSans-Regular.ttf" ]; then
+        cp "$FONTS_DIR/NotoSans-Regular.ttf" "$DIN_TARGET"
+        echo "  -> Copied Noto Sans Regular as $DIN_TARGET"
+    else
+        echo "  ERROR: No fallback font available!"
+        exit 1
+    fi
+fi
+
+# --- IMAGES ---
+echo ""
+echo "--- Images ---"
+
+REI_TARGET="$IMAGES_DIR/rei_default.png"
+REI_SOURCE="$EXTRA_IMAGES/rei_default.png"
+
+# Remove old symlink/file
+rm -f "$REI_TARGET"
+
+if [ -f "$REI_SOURCE" ]; then
+    echo "Dashboard image found - linking/copying"
+    # Try symlink first, fall back to copy (Windows compatibility)
+    if ln -s "$REI_SOURCE" "$REI_TARGET" 2>/dev/null; then
+        echo "  -> Linked $REI_TARGET -> $REI_SOURCE"
+    else
+        cp "$REI_SOURCE" "$REI_TARGET"
+        echo "  -> Copied $REI_TARGET (symlinks not supported)"
+    fi
+else
+    echo "Dashboard image not found - will use empty fallback at runtime"
+    # Create a tiny transparent PNG placeholder (1x1 pixel)
+    # This avoids asset not found errors while keeping the build clean
+    printf '\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\x01\x00\x00\x00\x01\x08\x06\x00\x00\x00\x1f\x15\xc4\x89\x00\x00\x00\nIDATx\x9cc\x00\x01\x00\x00\x05\x00\x01\r\n-\xb4\x00\x00\x00\x00IEND\xaeB`\x82' > "$REI_TARGET"
+    echo "  -> Created 1x1 transparent placeholder"
+fi
+
+echo ""
+echo "=== Asset preparation complete ==="
+echo "You can now run: flutter build linux"