feat: add in-app update checker, enhance About page and project metadata

- Add AtlasUpdateChecker with GitHub Releases API integration
- Add AtlasVersionComparator for semantic version comparison
- Add AboutUpdateToolbarButton with popover update UI
- Enhance AboutFeatureView with social QR codes and layout refinements
- Add CHANGELOG.md and CODE_OF_CONDUCT.md
- Rebrand project files from Mole to Atlas for Mac
- Update build script to support version/build number injection
- Add installation guide to README
- Add bilingual localization strings for update feature
- Add unit tests for update checker and version comparator

project.yml

@@ -37,7 +37,11 @@ targets:
       base:
         PRODUCT_BUNDLE_IDENTIFIER: com.atlasformac.app.worker
         PRODUCT_NAME: AtlasWorkerXPC
+        MARKETING_VERSION: "1.0.0"
+        CURRENT_PROJECT_VERSION: 1
         GENERATE_INFOPLIST_FILE: YES
+        INFOPLIST_KEY_CFBundleShortVersionString: $(MARKETING_VERSION)
+        INFOPLIST_KEY_CFBundleVersion: $(CURRENT_PROJECT_VERSION)
         AD_HOC_CODE_SIGNING_ALLOWED: YES
     dependencies:
       - package: Packages
@@ -58,7 +62,11 @@ targets:
       base:
         PRODUCT_BUNDLE_IDENTIFIER: com.atlasformac.app
         PRODUCT_NAME: Atlas for Mac
+        MARKETING_VERSION: "1.0.0"
+        CURRENT_PROJECT_VERSION: 1
         GENERATE_INFOPLIST_FILE: YES
+        INFOPLIST_KEY_CFBundleShortVersionString: $(MARKETING_VERSION)
+        INFOPLIST_KEY_CFBundleVersion: $(CURRENT_PROJECT_VERSION)
         AD_HOC_CODE_SIGNING_ALLOWED: YES
         INFOPLIST_KEY_CFBundleDisplayName: Atlas for Mac
         INFOPLIST_KEY_LSApplicationCategoryType: public.app-category.utilities