Use Effect UI mutation boundaries

[RhysSullivan]

Summary

• convert source/policy UI mutation handlers from promise try/catch to promiseExit
• mark browser popup and react-hook-form message reads as narrow UI boundaries
• remove redundant casts from optimistic connection removal helpers

Verification

• bunx oxlint --format=unix packages/react/src/api/oauth-popup.ts packages/react/src/api/optimistic.tsx packages/react/src/components/form.tsx packages/react/src/pages/policies.tsx packages/react/src/pages/source-detail.tsx packages/react/src/pages/sources.tsx
• bun run --cwd packages/react typecheck

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commit: c403f48