Add Task Count Indicator for "This Week" Bucket

With the recent shift to "buckets" for planning, some tasks feel easier to miss—especially those planned for the week but not assigned to a specific day. Previously, seeing tasks in the inbox provided a clear visual cue that something needed attention. It would be helpful to have a small indicator (e.g., a task count) on the "This Week" bucket to highlight tasks due in the next 48 hours.

Additionally, having a consistent place for Aki to surface reminders or nudges would improve visibility and ensure tasks don't slip through the cracks.