fix(packaging): resolve RPM installation and module import issues

- Fix Python module import by adding PYTHONPATH to launcher script
- Make icon installation robust with fallback placeholder SVG
- Ensure desktop file is properly installed from src/resources/desktop/
- Add error handling to launcher for better debugging

The RPM package now works correctly when installed, allowing the
application to launch from both command line and desktop icon via DEBUG option.

Fixes issues with:
- ModuleNotFoundError when running 'sql-schema-studio'
- Missing icon and desktop files during RPM build

Author: Peter-L-SVK

scripts/packaging/build_rpm.sh

@@ -124,20 +124,38 @@ Features:
 mkdir -p %{buildroot}/usr/lib/python3/dist-packages/src
 cp -r src/* %{buildroot}/usr/lib/python3/dist-packages/src/
 
+# Ensure __init__.py exists if it doesn't
+if [ ! -f "%{buildroot}/usr/lib/python3/dist-packages/src/__init__.py" ]; then
+    touch %{buildroot}/usr/lib/python3/dist-packages/src/__init__.py
+fi
+
 # Remove __pycache__
 find %{buildroot} -name "__pycache__" -type d -exec rm -rf {} + 2>/dev/null || true
 
 # Install icon
 mkdir -p %{buildroot}/usr/share/icons/hicolor/scalable/apps/
 if [ -f "src/resources/ui/icons/logo.svg" ]; then
     cp src/resources/ui/icons/logo.svg %{buildroot}/usr/share/icons/hicolor/scalable/apps/sql-schema-studio.svg
+elif [ -f "src/resources/ui/icons/sql-schema-studio.svg" ]; then
+    cp src/resources/ui/icons/sql-schema-studio.svg %{buildroot}/usr/share/icons/hicolor/scalable/apps/sql-schema-studio.svg
+else
+    # Create a simple placeholder icon if no icon exists
+    cat > %{buildroot}/usr/share/icons/hicolor/scalable/apps/sql-schema-studio.svg << 'SVG_EOF'
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="100" height="100">
+  <rect width="100" height="100" rx="20" fill="#2d3748"/>
+  <text x="50" y="55" font-family="Arial" font-size="40" font-weight="bold" fill="#48bb78" text-anchor="middle">SQL</text>
+  <text x="50" y="75" font-family="Arial" font-size="12" fill="#a0aec0" text-anchor="middle">Schema Studio</text>
+</svg>
+SVG_EOF
+    echo "WARNING: No icon found, using placeholder"
 fi
 
 # Install desktop file
 mkdir -p %{buildroot}/usr/share/applications/
 if [ -f "src/resources/desktop/sql-schema-studio.desktop" ]; then
     cp src/resources/desktop/sql-schema-studio.desktop %{buildroot}/usr/share/applications/
 else
+    # Fallback desktop file
     cat > %{buildroot}/usr/share/applications/sql-schema-studio.desktop << 'DESKTOP_EOF'
 [Desktop Entry]
 Name=SQL Schema Studio
@@ -149,14 +167,31 @@ Type=Application
 Categories=Development;Database;IDE;
 StartupWMClass=SQL Schema Studio
 MimeType=text/x-sql;
+Keywords=postgresql;database;sql;schema;designer;analytics;
 DESKTOP_EOF
 fi
 
 # Create launcher script
 mkdir -p %{buildroot}/usr/bin
 cat > %{buildroot}/usr/bin/sql-schema-studio << 'LAUNCHER_EOF'
-#!/bin/bash
-exec python3 -m src.main "$@"
+#!/usr/bin/env python3
+import sys
+import os
+
+# Add the dist-packages directory to sys.path
+dist_packages = '/usr/lib/python3/dist-packages'
+if os.path.exists(dist_packages):
+    sys.path.insert(0, dist_packages)
+
+# Try to import and run main
+try:
+    from src.main import main
+    sys.exit(main())
+except ImportError as e:
+    print(f"Error: Could not import SQL Schema Studio module", file=sys.stderr)
+    print(f"Details: {e}", file=sys.stderr)
+    print(f"Python path: {sys.path}", file=sys.stderr)
+    sys.exit(1)
 LAUNCHER_EOF
 chmod 755 %{buildroot}/usr/bin/sql-schema-studio