[Feature]: Unified agenda view (events + tasks)

[CodeWithInferno]

Problem

Users need to check both the calendar AND kanban/task list to understand what's happening. There's no single view that shows both scheduled events and tasks with due dates.

Solution

Create a unified agenda sidebar panel that combines calendar events and tasks chronologically.

Features

• Single timeline showing events AND tasks with due dates
• Sections: Today, Tomorrow, This Week, Overdue
• Events show time, title, calendar color
• Tasks show due date/time, title, completion checkbox
• Click event → opens calendar view
• Click task → opens in editor or kanban
• Quick actions: complete task, view event details
• Collapsible sections by day
• Real-time updates when events/tasks change

Visual Layout

📅 AGENDA
─────────────
▾ Today (Jan 23)
  🔵 09:00 Team Standup
  ☐ Submit report (due 5pm)
  🔵 14:00 1:1 with Manager

▾ Tomorrow (Jan 24)
  🔵 10:00 Sprint Planning
  ☐ Review PR #123

▸ This Week (3 items)

⚠️ Overdue (2 items)

Implementation Tasks

• Create AgendaPanel component
• Fetch and merge events + tasks for date range
• Implement chronological sorting
• Create day section grouping
• Add expand/collapse for sections
• Implement click handlers for navigation
• Add task completion checkbox
• Add to sidebar as new panel option
• Real-time subscription to event/task changes

Priority

Medium - Would improve my workflow

Complexity

Moderate - New component or workflow