feat: Enhance Obsidian Halo Plugin with comprehensive design system and component styles

- Updated styles.css to implement a three-layer design token architecture: Primitive, Semantic, and Component.
- Introduced new CSS variables for colors, spacing, typography, and shadows.
- Developed styles for buttons, cards, inputs, textareas, selects, badges, tables, modals, forms, color pickers, empty states, and loading spinners.
- Improved sync status view with responsive design and enhanced UI elements.
- Added skeleton loading animations for better user experience.

chore: Add configuration files for development environment

- Created .claude/settings.json to enable commit commands plugin.
- Added .vscode/c_cpp_properties.json for C/C++ IntelliSense configuration.
- Introduced .vscode/launch.json for debugging C/C++ applications with GDB.

.obsidian/workspace.json

@@ -156,13 +156,12 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "博客/Git团队协作指南（精简版）.md",
                 "followCursor": true,
                 "showSearch": true,
                 "searchQuery": ""
               },
               "icon": "lucide-list",
-              "title": "Git团队协作指南（精简版） 的大纲"
+              "title": "大纲"
             }
           },
           {