Wanderlust: Travel Expenses

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• Altered the purchase amount field in the expense editor to automatically add thousands separators during user input, accept both dots and commas as input but change them to the appropriate decimal symbol according to the device's locale setting, and other minor functionality improvements.
• Added a month filter to the pie chart.
• Created a custom dark theme.
• Bug fixes.

Further updates are being worked on to improve functionality and reduce clutter - particularly for the summary tab.