docs: add code style guidelines to CLAUDE.md

Added comprehensive code style section documenting:
- Brace placement preferences (opening braces on new lines)
- Variable naming conventions by scope (snake_case locals, camelCase members/parameters)
- Benefits and examples of preferred style

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

CLAUDE.md

@@ -159,6 +159,63 @@ app/src/main/java/com/quillstudios/pokegoalshelper/
 - Use interfaces for dependency injection
 - Keep functions small and focused
 
+### Code Style Guidelines
+
+#### Brace Placement
+- Opening braces `{` go on the line **below** functions and statements
+- This improves visual separation and readability
+
+```kotlin
+// Preferred style
+fun myFunction()
+{
+    if (condition)
+    {
+        // code here
+    }
+}
+
+// NOT this style
+fun myFunction() {
+    if (condition) {
+        // code here
+    }
+}
+```
+
+#### Variable Naming Conventions
+Use different naming patterns to distinguish variable scope at a glance:
+
+- **Local variables**: `snake_case` (e.g., `display_metrics`, `captured_image`, `window_manager`)
+- **Member variables**: `camelCase` (e.g., `screenWidth`, `mediaProjection`, `isActive`)
+- **Function parameters**: `camelCase` (e.g., `resultData`, `callback`, `className`)
+- **Constants**: `UPPER_SNAKE_CASE` (e.g., `TAG`, `BUFFER_COUNT`)
+
+```kotlin
+class ExampleClass
+{
+    // Member variables in camelCase
+    private var screenWidth = 0
+    private var mediaProjection: MediaProjection? = null
+    
+    // Function parameters in camelCase
+    fun processData(inputData: String, callback: (String) -> Unit)
+    {
+        // Local variables in snake_case
+        val processed_result = inputData.uppercase()
+        val final_output = "Result: $processed_result"
+        
+        callback(final_output)
+    }
+}
+```
+
+#### Benefits of This Style
+- **Instant recognition**: Variable scope is immediately visible
+- **Improved debugging**: Easy to distinguish locals from members
+- **Better readability**: Clean visual structure with separated braces
+- **Consistent codebase**: All new code follows the same patterns
+
 ### Documentation
 - Update this file when patterns change
 - Document complex business logic