Add logging to the API to keep track of specific requests and headers. Also added CORS middleware to handle OPTIONS requests.

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The commit adds logging functionality to the API and includes a middleware function to handle CORS OPTIONS requests. This will allow us to track specific requests and headers received by the API.

[API/main.go](/api/main.go):
- Added import for the 'log' package
- Added logging statements to print the request headers and "_I am here_" message
- Removed unnecessary newlines and comments

[fe/src/app.css](/fe/src/app.css):
- Added a new style for button hover effects

[fe/src/lib/Card.svelte](/fe/src/lib/Card.svelte):
- Added a new `height` prop to the Card component

[fe/src/lib/Column.svelte](/fe/src/lib/Column.svelte):
- Added a new CSS class for column layout
- Set the width and gap using CSS variables

[fe/src/lib/DataView.svelte](/fe/src/lib/DataView.svelte):
- Updated the 'fetchData' function to also fetch 'totals' and 'userStats' data
- Added canvas references and chart variables for bar and line charts
- Added a new 'getLastSevenDays' function to calculate the labels for the charts
- Updated the 'onMount' function to initialize the bar and line charts using the canvas references and data
- Updated the 'onDestroy' function to destroy the bar and line charts
- Added a new 'addFormOpen' store and imported it
- Added a new 'onClick' handler for the Add button to open the AddForm modal
- Updated the layout and added Card components to display the bar and line charts and the JSON data
- Added a new 'fetchTotals' function to fetch data for the 'totals' section
- Added a new 'fetchStatsForUser' function to fetch data for the 'userStats' section

[fe/src/lib/Layout.svelte](/fe/src/lib/Layout.svelte):
- Added a new 'preferenceFormOpen' variable and initialized it to 'false'
- Added a new 'showPreferencesDialog' function to set 'preferenceFormOpen' to 'true'
- Added a new 'closePreferenceDialog' function to set 'preferenceFormOpen' to 'false'
- Added a new 'showAddDialog' function to open the AddForm modal