Calendar Sync: Event Filtering (Acceptance/Response Status)

[krisrowe]

Problem\nAll events from the source calendar are currently synced regardless of the user's response status. This includes declined or unconfirmed events, which may clutter the target calendar.\n\n### Proposed Filtering Capabilities\nWe should add the ability to filter events during the export or sync process based on responseStatus.\n\n#### Filtering Options:\n- Include Only Accepted: Only sync events where the user has explicitly accepted the invite.\n- Exclude Declined: Sync everything except declined events (include 'needsAction', 'tentative', 'accepted').\n- Confirmed Events Only: Filter based on the top-level status of the event (e.g., 'confirmed' vs 'tentative').\n\n### Implementation Strategy\nAdd a --filter-status or --only-accepted flag to the sync and export commands. Use the attendees list in the event object to check the response status for the current user's email.