feat: drag-and-drop entries across days and editable date in entry modal

[EdiWeeks]

Summary

• Edit modal gains a Date dropdown constrained to the current week; the title now updates as the date changes. Saving a new date moves the entry.
• Weekly view supports HTML5 drag-and-drop between day columns with a green highlight on the drop target.
• Both gated by the existing isTimesheetEditable check, so locked/submitted/approved timesheets stay read-only.
• New service method moveEntryDate(entryId, newDate): writes hours to the new date, then zeros the old one (BC details key on line+date). Same-line conflicts on the target date are merged (hours sum).

Test plan

• Open a time entry, change Date to another day in the week, click Update — entry moves; weekly totals update.
• Drag an entry from one day onto another — target column highlights green; on drop entry moves.
• Try dragging an entry onto its own day — no-op, no toast.
• Submit timesheet, then try to drag an entry — drag is gated (modal also blocks edits).
• Move an entry to a day that already has an entry on the same line (same project/task/notes) — hours sum.
• Move an entry to a day that has an entry on a different line — both entries appear separately on that day.
• Modal title updates as you change the Date dropdown.

Fixes #194
Fixes #195

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds the ability to reassign time entries to different days within the current week, via both a Date selector in the entry modal and HTML5 drag-and-drop in the weekly grid. This builds on the existing Business Central timesheet-line + date-detail model by introducing a dedicated “move date” mutation and refreshing client state from the service cache after moves.

Changes:

• Added timeEntryService.moveEntryDate(entryId, newDate) plus a cache-to-entries helper to refresh UI state after merges.
• Wired a new moveEntryDate action into the Zustand time entries store.
• Updated weekly timesheet UI to support drag/drop across day columns and updated the modal to allow changing an entry’s date within the week.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/services/bc/timeEntryService.ts	Adds moveEntryDate (including same-line merge behavior) and getCachedEntries for post-mutation refresh.
src/hooks/useTimeEntriesStore.ts	Exposes moveEntryDate in the store and refreshes entries from the service cache after moves.
src/components/timesheet/WeeklyTimesheet.tsx	Plumbs onMoveEntry into day cells and passes weekStart to the modal.
src/components/timesheet/TimeEntryModal.tsx	Adds an in-week Date dropdown and triggers move+update flow when editing entries.
src/components/timesheet/TimeEntryCell.tsx	Implements HTML5 drag-and-drop source/target behavior with drop-target highlighting.

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