Add Sentry feedback widget trigger

[InfinityBowman]

Context

The Sentry feedback integration is already initialized in packages/web/src/config/sentry.ts with autoInject: false. It needs a UI trigger to surface it to users.

Tasks

• Decide where to place the feedback button (e.g., help menu, footer, settings page)
• Wire it up via Sentry.getFeedback()?.openDialog() or switch to autoInject: true
• Consider whether to gate it behind authentication or show to all users

References

• Sentry Feedback docs: https://docs.sentry.io/platforms/javascript/user-feedback/
• Current config: packages/web/src/config/sentry.ts (feedbackIntegration call)