fix: resolve shellcheck warnings

- lint_python.sh: remove unused VERBOSE variable, use OVERALL_STATUS for exit
- run_game.sh: add || exit after cd
- install_arch.sh/uninstall_arch.sh: separate local declaration and assignment
- lint.sh: use variable for pkg-config output to avoid word splitting

C/imageViewer/install_arch.sh

@@ -254,7 +254,8 @@ test_installation() {
 
         # Test default application association
         if command -v xdg-mime &> /dev/null; then
-            local default_app=$(xdg-mime query default image/jpeg 2>/dev/null)
+            local default_app
+            default_app=$(xdg-mime query default image/jpeg 2>/dev/null)
             if [[ "$default_app" == "imageviewer.desktop" ]]; then
                 print_success "imageviewer is set as default image viewer"
             else

C/imageViewer/lint.sh

@@ -115,8 +115,10 @@ compile_check() {
     print_step "Running compile check..."
 
     # Try to compile with extra warnings
+    local sdl_cflags
+    sdl_cflags=$(pkg-config --cflags sdl2 2>/dev/null || echo "-I/usr/include/SDL2")
     if gcc -Wall -Wextra -Wpedantic -std=c99 -O2 \
-           $(pkg-config --cflags sdl2 2>/dev/null || echo "-I/usr/include/SDL2") \
+           ${sdl_cflags} \
            -c main.c -o /tmp/main.o 2>/dev/null; then
         print_success "Compile check passed"
         rm -f /tmp/main.o
@@ -124,7 +126,7 @@ compile_check() {
         print_error "Compile check failed"
         print_step "Trying compile with detailed errors..."
         gcc -Wall -Wextra -Wpedantic -std=c99 -O2 \
-            $(pkg-config --cflags sdl2 2>/dev/null || echo "-I/usr/include/SDL2") \
+            ${sdl_cflags} \
             -c main.c -o /tmp/main.o
     fi
 }

C/imageViewer/uninstall_arch.sh

@@ -79,7 +79,8 @@ reset_default_associations() {
     for mime_type in "${mime_types[@]}"; do
         if command -v xdg-mime &> /dev/null; then
             # Check if imageviewer was the default
-            local current_default=$(xdg-mime query default "$mime_type" 2>/dev/null)
+            local current_default
+            current_default=$(xdg-mime query default "$mime_type" 2>/dev/null)
             if [[ "$current_default" == "imageviewer.desktop" ]]; then
                 # Remove the association (this will fall back to system defaults)
                 local mimeapps_file="$HOME/.config/mimeapps.list"