Improve discovery and promotion of new Conclave features

## Motivation
A participant said they would create a dummy meeting just to explore the new Conclave update, suggesting that new features are not easy to discover or understand in-product.

## Proposal
Create a better way to advertise and introduce newly released Conclave features, with particular attention to:

- **Ideation/discussion workflows:** make it clear that participants can use Conclave to capture ideas and turn them into structured GitHub issues for review.
- **Invite features:** surface and explain meeting invite capabilities so users know how to bring others into a meeting.

## Potential approaches
- Add a lightweight **“What’s new”** entry point or release highlights.
- Show contextual onboarding/tooltips when a relevant feature is first available.
- Provide a short, discoverable feature guide or in-product walkthrough.
- Consider a demo/exploration mode that avoids requiring users to create a dummy meeting solely to find features.

## Acceptance criteria
- Users can discover recently added features without needing to create a test meeting.
- The ideation-to-GitHub-issue workflow and invite functionality are clearly surfaced or documented.
- The approach is lightweight and does not disrupt active meetings.

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Requested by **Ishaan** during a Conclave meeting.

No files, tests, or entry points are named. Start by locating the meeting UI and existing onboarding or release-highlight surfaces, then determine how to expose ideation-to-GitHub-issue and invite features without disrupting active meetings; done means users can discover and understand both workflows without creating a dummy meeting.

Written by the indexing model from the issue text.