Feat: add export functionality with GUI for data and graphs

- Implemented ExportWindow class for exporting data and graphs in various formats (JSON, XML, PDF).
- Integrated ExportManager to handle export logic.
- Added export option in the main application menu.
- Enhanced user interface with data summary and export options.
- Included error handling and success messages for export operations.
- Updated dependencies in the lock file to include reportlab and lxml for PDF generation.

scripts/README.md

@@ -0,0 +1,61 @@
+# TheChart Scripts Directory
+
+This directory contains testing and utility scripts for TheChart application.
+
+## Scripts Overview
+
+### Testing Scripts
+
+#### `run_tests.py`
+Main test runner for the application.
+```bash
+cd /home/will/Code/thechart
+.venv/bin/python scripts/run_tests.py
+```
+
+#### `integration_test.py`
+Comprehensive integration test for the export system.
+- Tests all export formats (JSON, XML, PDF)
+- Validates data integrity and file creation
+- No GUI dependencies - safe for automated testing
+
+```bash
+cd /home/will/Code/thechart
+.venv/bin/python scripts/integration_test.py
+```
+
+### Feature Testing Scripts
+
+#### `test_note_saving.py`
+Tests note saving and retrieval functionality.
+- Validates note persistence in CSV files
+- Tests special characters and formatting
+
+#### `test_update_entry.py`
+Tests entry update functionality.
+- Validates data modification operations
+- Tests date validation and duplicate handling
+
+## Usage
+
+All scripts should be run from the project root directory:
+
+```bash
+cd /home/will/Code/thechart
+.venv/bin/python scripts/<script_name>.py
+```
+
+## Test Data
+
+- Integration tests create temporary export files in `integration_test_exports/` (auto-cleaned)
+- Test scripts use the main `thechart_data.csv` file unless specified otherwise
+- No test data is committed to the repository
+
+## Development
+
+When adding new scripts:
+1. Place them in this directory
+2. Use the standard shebang: `#!/usr/bin/env python3`
+3. Add proper docstrings and error handling
+4. Update this README with script documentation
+5. Follow the project's linting and formatting standards