feat: GTK3-only theming overhaul—new theme service (discover/import/inherits), layered CSS+settings.ini apply w/ safe rollback + caching; widget/xtext palette mapping + all-colors editor; lots of win32/CI libarchive plumbing + installer assets;

src/common/meson.build

@@ -3,7 +3,7 @@ common_sources = [
   'chanopt.c',
   'ctcp.c',
   'dcc.c',
-  'theme-service.c',
+  'gtk3-theme-service.c',
   'zoitechat.c',
   'history.c',
   'ignore.c',
@@ -28,12 +28,17 @@ common_sources = [
 ]
 
 common_sysinfo_deps = []
+libarchive_dep = dependency('libarchive', required: host_machine.system() != 'windows')
 
 common_deps = [
   libgio_dep,
   libcanberra_dep,
 ] + global_deps
 
+if libarchive_dep.found()
+  common_deps += libarchive_dep
+endif
+
 common_includes = [
   config_h_include,
   include_directories('.')
@@ -134,3 +139,18 @@ zoitechat_plugin_dep = declare_dependency(
   compile_args: common_cflags,
   dependencies: global_deps,
 )
+
+
+gtk3_theme_service_tests = executable('gtk3_theme_service_tests',
+  [
+    'tests/test-gtk3-theme-service.c',
+    'gtk3-theme-service.c',
+  ],
+  include_directories: [config_h_include, include_directories('.')],
+  dependencies: [libgio_dep] + (libarchive_dep.found() ? [libarchive_dep] : []),
+)
+
+test('GTK3 Theme Service Tests', gtk3_theme_service_tests,
+  protocol: 'tap',
+  timeout: 120,
+)