fix(web): memoize Zero provider opts to prevent reconnect churn

[xr843]

Summary

Closes #1097.

ZeroProvider rebuilt its opts object and its derived context on
every render, then spread them into <ZeroReactProvider>. If the
underlying Rocicorp Zero provider compares props by reference
(internally or for effect deps), that can trigger extra reconnects or
state churn every time anything above ZeroProvider re-renders.

Change

Wrap opts and context in useMemo:

const context = useMemo(
  () => (hasUser ? { userId: String(userId) } : undefined),
  [hasUser, userId],
);

const opts = useMemo(
  () => ({ userID, schema, queries, context, cacheURL, auth }),
  [userID, context, auth],
);

auth comes from getBearerToken() which returns a string (a
primitive), so reference equality already holds for unchanged tokens —
no useMemo needed. When the token changes, auth becomes a different
string and opts is rebuilt as expected.

schema, queries, and cacheURL are module-level constants so they
are already stable across renders.

Testing

• Static analysis only — I do not have the Zero sync running locally.
  Please verify that the existing Zero sync / subscription behavior is
  unchanged for both anonymous and authenticated sessions.

Acceptance criteria (from #1097)

• opts is memoized with useMemo
• context is a stable reference
• auth read path unchanged (primitive comparison keeps reference
  stable without an extra useMemo)

High-level PR Summary

This PR fixes a performance issue in the ZeroProvider component where the opts and context objects were being recreated on every render, causing unnecessary reconnections to the Zero provider. The fix wraps both objects in useMemo hooks with appropriate dependencies to ensure stable references across renders, preventing connection churn when parent components re-render.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_web/components/providers/ZeroProvider.tsx

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Review by RecurseML

🔍 Review performed on 656e061..68e6acd

✨ No bugs found, your code is sparkling clean

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• surfsense_web/components/providers/ZeroProvider.tsx