fix: avoid upcoming meeting hidden WebView crash

[calebchongc]

Summary

• Skip upcoming-meeting UI refreshes while the main window is hidden, so the calendar poll does not mutate a tray-hidden WebView.
• Gate Recall auto-expand on the main window being both visible and focused before it resizes/repositions the WebView.
• Add a frontend contract test for the upcoming-meeting prep auto-expand guard.

Testing

• cargo fmt --all -- --check
• cargo clippy --all --no-default-features -- -D warnings
• cargo test -p minutes-app --no-default-features
• ./scripts/install-dev-app.sh
• Relaunched ~/Applications/Minutes Dev.app, hid the main window, waited 75s for the upcoming-meeting poll interval, and confirmed PID stayed alive with no new minutes-app .ips after the 2026-06-15 14:27:23 pre-fix crash report.

[vercel]

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[calebchongc]

Closing while I investigate additional local crash reports. I will follow up with a cleaner fix from my fork once the dismiss/popup crash is understood.