FEAT: Support CLAUDE_CONFIG_DIR (#99)

* chore: automatic change from linting

* feat: support CLAUDE_CONFIG_DIR on utilities

* feat: support CLAUDE_CONFIG_DIR from the main app UI

* fix: reduce duplication and handle installation using new constants

* feat: missed one place using hardcoded path

* chore: update CLAUDE.md

* docs: Update README

README.md

@@ -125,6 +125,7 @@
 - **🖥️ Interactive TUI** - Built-in configuration interface using React/Ink
 - **⚙️ Global Options** - Apply consistent formatting across all widgets (padding, separators, bold, background)
 - **🚀 Cross-platform** - Works seamlessly with both Bun and Node.js
+- **🔧 Flexible Configuration** - Supports custom Claude Code config directory via `CLAUDE_CONFIG_DIR` environment variable
 - **📏 Smart Width Detection** - Automatically adapts to terminal width with flex separators
 - **⚡ Zero Config** - Sensible defaults that work out of the box
 
@@ -155,6 +156,15 @@ The interactive configuration tool provides a terminal UI where you can:
 
 > 💡 **Tip:** Your settings are automatically saved to `~/.config/ccstatusline/settings.json`
 
+> 🔧 **Custom Claude Config:** If your Claude Code configuration is in a non-standard location, set the `CLAUDE_CONFIG_DIR` environment variable:
+> ```bash
+> # Linux/macOS
+> export CLAUDE_CONFIG_DIR=/custom/path/to/.claude
+> 
+> # Windows PowerShell
+> $env:CLAUDE_CONFIG_DIR="C:\custom\path\.claude"
+> ```
+
 ---
 
 ## 🪟 Windows Support
@@ -294,7 +304,11 @@ For the best experience, configure Windows Terminal with these recommended setti
 #### Claude Code Integration
 Configure ccstatusline in your Claude Code settings:
 
-**For Bun users** (Windows: `%USERPROFILE%\.claude\settings.json`):
+**Settings Location:**
+- Default: `~/.claude/settings.json` (Windows: `%USERPROFILE%\.claude\settings.json`)
+- Custom: Set `CLAUDE_CONFIG_DIR` environment variable to use a different directory
+
+**For Bun users**:
 ```json
 {
   "statusLine": "bunx ccstatusline@latest"
@@ -308,6 +322,8 @@ Configure ccstatusline in your Claude Code settings:
 }
 ```
 
+> 💡 **Custom Config Directory:** If you use a non-standard Claude Code configuration directory, set the `CLAUDE_CONFIG_DIR` environment variable before running ccstatusline. The tool will automatically detect and use your custom location.
+
 ### Performance on Windows
 
 ccstatusline is optimized for Windows performance:
@@ -561,7 +577,7 @@ ccstatusline/
 │   │   ├── renderer.ts         # Core rendering logic
 │   │   ├── powerline.ts        # Powerline font utilities
 │   │   ├── colors.ts           # Color definitions
-│   │   └── claude-settings.ts  # Claude Code integration
+│   │   └── claude-settings.ts  # Claude Code integration (supports CLAUDE_CONFIG_DIR)
 │   └── types/                  # TypeScript type definitions
 │       ├── Settings.ts
 │       ├── Widget.ts