fix: Fix error in start meeting if the user has no teams

[Dschoordsch]

Partially fixes #10046
Show a more helpful error message instead
This does not address the underlying issue of not having the teams available on signup.

Demo

[If possible, please include a screenshot or gif/video, it'll make it easier for reviewers to understand the scope of the changes and how the change is supposed to work. If you're introducing something new or changing the existing patterns, please share a Loom and explain what decisions you've made and under what circumstances]

Testing scenarios

[Please list all the testing scenarios a reviewer has to check before approving the PR]

• remove all teams
• open activity library and select a template
• check the side panel

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• I have tested all cases I listed in the testing scenarios and I haven't found any issues or regressions
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Summary by CodeRabbit

• New Features

  • Improved user guidance for team selection with a new link for creating teams when none are available.
  • Enhanced handling of team selection logic, ensuring safer access to selected teams.
  • Conditional rendering of additional context in the DashNavList component, maintaining layout even without teams.
  • Refined error handling in the TimelineSuggestedAction component to prevent crashes when suggested actions are undefined.

• Bug Fixes

  • Corrected potential runtime errors related to accessing empty or undefined arrays for teams and suggested actions.

[coderabbitai]

Walkthrough

The code changes enhance user experience and error handling across multiple components by improving the handling of team selection. They introduce safe access patterns for potentially undefined values and modify rendering logic to provide better context when no teams are available. This ensures that users receive appropriate guidance and that the application behaves more robustly in scenarios where team data may be lacking.

Changes

Files	Change Summary
.../ActivityLibrary/ActivityDetailsSidebar.tsx .../ActivityLibrary/TeamPickerModal.tsx	Introduced safe checks for team selection, enhancing user guidance when no teams are available. Removed forced non-null assertions to improve type safety.
.../DashNavList/DashNavList.tsx	Modified rendering logic to provide more context when no teams are present, allowing a full component structure to be displayed.
.../TimelineSuggestedAction.tsx	Improved safety in handling the suggestedActions array by using optional chaining and conditional rendering to prevent runtime errors.

Assessment against linked issues

Objective	Addressed	Explanation
No teams displayed after account creation ( #10046 )	✅
Error handling for undefined selectedTeam ( #10046 )	✅

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