Update the timesheet detail page to correctly handle the deletion of time entries by ensuring that entries with zero hours are included in the save operation when they have been modified.
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Replaces the simple click-to-cycle hour selection with a Popover component in `artifacts/cra-app/src/pages/timesheet-detail.tsx`, allowing users to select from a wider range of predefined hour options.
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Adds a unique constraint to the database schema for time entries, preventing duplicates for the same month and collaborator. Also updates the API to check for existing entries before creation and unifies the collaborator name used in the dialog.
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Implements a new quick entry feature with a dedicated API route and frontend component, allowing users to rapidly log time against projects by selecting a project, date, and predefined hour increments, with automatic creation of timesheets and lines if they don't exist.
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