fix(filter): resolve multi_select filter validation error in advanced filtering

[SteveLin100132]

Fixes: #23

This pull request primarily refactors the SettingsPanel component in frontend/src/components/settings-panel.tsx to use consistent double-quote style and improve code readability, while also enhancing the robustness and clarity of the chart generation and filter handling logic. There are no functional changes to business logic, but the code is now more maintainable and easier to follow. Additionally, the CHANGELOG.md is updated to document a recent bug fix for multi-select filtering.

Changelog update:

• Added a detailed entry for version 1.1.7, documenting the fix for multi-select field filtering errors when generating charts, including root cause, solution, and affected files.

Code style and readability improvements:

• Refactored frontend/src/components/settings-panel.tsx to consistently use double quotes, add semicolons, and improve indentation and formatting throughout the file. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14]

Chart generation and filter handling improvements:

• Improved error handling and logging in chart generation, including clearer console outputs and more robust error messages. [1] [2]
• Enhanced the logic for handling filter groups and converting them to Notion API filters, with additional debug logs for troubleshooting. [1] [2]
• Updated UI components to improve user feedback, such as dynamically disabling/enabling controls based on available properties and filter states. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]

These changes should make the codebase easier to maintain and help prevent similar issues with filter handling in the future.