fix(user-context): stop every page crashing on the streamed profile promise

[chriskehayias]

Summary

• Bug: after sign-in, every page in the (web) shell fell through to the root error boundary with An unsupported type was passed to use(): undefined.
• Cause: the profile promise ServerProviders streams to the client arrives as React Flight's ReactPromise, whose then() returns undefined. UserProvider called profilePromise.catch(...), which therefore returned undefined, and useUser() passed that to use().
• Fix: settle the promise with await inside an async helper (settleProfile), which relies only on then() invoking its callbacks. A failed load still degrades to null and logs user.profile.load_failed.
• Also adds .playwright-mcp/ to .gitignore, since its snapshots and console logs capture real MP member data.

Why the tests missed it

Existing tests passed native Promises, whose .catch() returns a new promise. The two new tests build a Flight-shaped promise (then() returns undefined), covering both resolve and reject. They fail without the fix.

Test plan

• npx vitest run --coverage: 2034 passed / 3 skipped, coverage thresholds met
• npm run lint and npx tsc --noEmit clean
• Manual Playwright pass against the dev server: sign-in, home, header avatar and user menu, sidebar, contact search (including special characters), contact details and logs, add/edit/delete dialogs opened and cancelled (no MP writes), error boundaries, status pages, 404, phone width, sign-out

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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