Description

The Calendar panel currently shows a flat list of upcoming events sorted by time. Add a 7-day grid view as an alternative display mode (toggled with v when the panel is focused): one column per day, events listed vertically within each day column.

Layout sketch:

Mon     Tue     Wed     Thu     Fri     Sat     Sun
Jun 9   Jun 10  Jun 11  Jun 12  Jun 13  Jun 14  Jun 15
──────  ──────  ──────  ──────  ──────  ──────  ──────
9:00am  All day         2:00pm
Standup Release         Dentist

Implementation:

• Group events[] from the calendar payload by event.start date into 7 buckets (today + 6 days)
• Render as a Horizontal of 7 equal-width columns inside the panel
• All-day events appear at top of their column
• Time-specific events show time + title
• v toggles between list view (current) and week grid view
• Week view default or list view default is a constant at top of file

Acceptance Criteria

• #1 v toggles between list and week-grid view in Calendar panel
• #2 Week grid shows 7 days starting from today
• #3 All-day events appear at top of their column
• #4 Timed events show time + title
• #5 Today's column is visually highlighted
• #6 Falls back to list view if fewer than 2 events in the window