Event conflict detection

[amahuli03]

• Add conflict detection to prevent double-booking when creating calendar events. Before creating an event, check if the suggested time conflicts with existing events, warn the user, and suggest alternative times.

How it'll work:

• When user requests to create an event, check for conflicts with existing events
• If a conflict is detected, show a warning message to the user
• Warning should include:
  • Details of the conflicting event (title, time)
  • The suggested new event details

Suggested new event details:

• Suggest alternative times that don't conflict
• Allow user to:
  • Proceed anyway (override the conflict)
  • Choose an alternative time
  • Cancel the event creation

(maybe) Handle edge cases:

• Events that partially overlap
• All-day events
• Recurring events