[AdamJ]

Summary

• Deleting the active task left the day with no running task and no way to resume the previous one.
• handleDeleteTask in Index.tsx now shows a "Resume previous task?" prompt when the deleted task was active and an earlier task exists, offering Resume or Start New Task.
• New context method reopenTask(taskId) clears a completed task's endTime/duration and makes it current again.

Test plan

• Start day, add task A, start task B (A auto-closes), delete B → prompt appears, Resume reopens A as active with timer running
• Same setup, choose "Start New Task" → no task active, Add Task flow available
• Delete active task when it's the only task of the day → no prompt, falls through to empty-day picker
• Delete a non-active (already completed) task → no prompt, unaffected

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