Improve task calendar usability and task creation functionality
Add `onKeyDown` handler to the task title input in `TaskCreationModal.tsx` to allow task creation with the Enter key. Enhance `TasksWithCalendar.tsx` to include `hoveredDate` state and `handleDragEnter`/`handleDragLeave` handlers for visual feedback during drag-and-drop operations on the calendar. Adjust the calendar's positioning to be fixed at the bottom with full width and modify styling for task cards during drag operations. Fix the display of the "today" border on the calendar. Replit-Commit-Author: Agent Replit-Commit-Session-Id: ceced2fc-aa46-458d-ba87-ddd4b7bb1518 Replit-Commit-Checkpoint-Type: intermediate_checkpoint Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/659922a9-0087-461c-90dd-6d9a58b81d4d/ceced2fc-aa46-458d-ba87-ddd4b7bb1518/sqJIbnU
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