feat: add next meeting widget

[floatas]

Shows the next upcoming calendar event in the bar with time until start and one-click join for video meetings. Uses icalBuddy for fast calendar access with proper recurring event support.

• Color-coded urgency: cyan (normal) → yellow (≤15 min) → red pulsing (≤5 min)
• Join button for Zoom, Teams, Google Meet, and Webex
• Handles Microsoft SafeLinks (Outlook URL protection) automatically
• Configurable look-ahead window and icalBuddy binary path
• Auto-hides when no upcoming meetings
• Requires icalBuddy: brew install ical-buddy

Description

Main motivation was to hide Dock - and have quick way to see notifications at work (Teams, outlook), also upcoming meeting.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Have been using these changes for ±3months locally.

Test Configuration:

• OS version 26.3.1
• aerospace AeroSpace v0.20.2-Beta 1a8128c53b231bac7e46917468d50b4f15ad30f7
• Übersicht version 1.6 (82)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas (make use of JSDoc if necessary)
• My changes generate no new warnings

Changes to make to the documentation

Please list any changes to the documentation that are required to reflect your changes.

[Jean-Tinland]

Hi again, same question as in your other pull request: please let know when you want me to review your work.

Thank you for your contribution!

[floatas]

Hey, sorry for delay, added some more info. Code in this MR might be vibe coded, but I think with proper review this would be extremely useful for everyone. Been using it for few months at work without any issues.