feat: add injection preview functionality and enhance specs management

- Implemented injection preview feature in InjectionControlTab with file listing and content preview.
- Added new API endpoint for fetching injection preview data.
- Introduced content length caching for performance optimization.
- Enhanced spec loading to support category filtering.
- Updated localization files for new features and terms.
- Created new personal and project specs for coding style and architecture constraints.
- Improved CLI options for category selection in spec commands.

.ccw/personal/tool-preferences.md

@@ -0,0 +1,25 @@
+---
+title: "Tool Preferences"
+dimension: personal
+category: general
+keywords:
+  - tool
+  - cli
+  - editor
+readMode: optional
+priority: low
+---
+
+# Tool Preferences
+
+## Editor
+
+- Preferred editor and key extensions/plugins
+
+## CLI Tools
+
+- Preferred shell, package manager, build tools
+
+## Debugging
+
+- Preferred debugging approach and tools