Fix TypeScript optional reducer params to allow omitted keys

[akshxdevs]

Summary

Fix TypeScript row inference so .optional() fields become optional object keys instead of required keys whose values may be undefined.

This resolves the reducer/view parameter typing issue described in #4516, where callers were forced to explicitly pass undefined for omitted optional fields.

Changes

• update InferTypeOfRow to split required and optional row keys
• add a regression type test for omitted optional fields
• loosen internal stored view function param typing to avoid an internal assignability issue exposed by the stricter row inference
• align the package typecheck command with the existing .test-d.ts style type tests

Example

Before:

await conn.reducers.updateCategory({
id: BigInt(1),
name: "updated category name",
buttonText: undefined,
headerText: undefined,
deleted: undefined,
});

After:

await conn.reducers.updateCategory({
id: BigInt(1),
name: "updated category name",
});

Verification

pnpm test:typecheck

Closes #4516

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