small onboarding improvements

[ccbrown]

What It Does

• Improve wording on registration page as it's gotten feedback that "stuff" sounded sketchy
• Show a message in the dashboard with guidance if there's no data
• Backfill data by default so users don't have to wait 24 hours to get started by default

[Copilot]

Pull Request Overview

This PR focuses on small onboarding improvements by refining user-facing copy and adjusting integration setup defaults to improve the onboarding experience.

• Updated registration page messaging to remove ambiguous language.
• Modified dashboard logic to display guidance when there is no data.
• Changed the default for backfilling data to occur immediately, reducing wait time for new users.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
frontend/src/app/(user-area)/teams/[teamId]/settings/integrations/page.tsx	Sets queueReportGeneration default to true for immediate backfill data ingestion.
frontend/src/app/(user-area)/teams/[teamId]/page.tsx	Refactored conditional rendering to show appropriate dashboard messages based on data availability.
frontend/src/app/(public-area)/register/RegistrationForm.tsx	Revised registration copy for clearer, unambiguous user guidance.