fix(api): preserve falsy query params in URL serialization

[ryanio]

Summary

• Fixed objectToSearchParams to correctly serialize falsy values (0, false, empty strings) that were incorrectly being filtered out by truthy checks
• Uses the idiomatic != null pattern which checks for both null and undefined in one comparison
• Added String() conversion for type safety when appending to URLSearchParams
• Simplified the logic by checking Array.isArray() first (since arrays are always truthy)

This is a cleaner alternative to #1874 which uses the same fix but with more verbose explicit checks.

Changes

Before:

if (value && Array.isArray(value)) {
  value.forEach((item) => item && urlSearchParams.append(key, item));
} else if (value) {
  urlSearchParams.append(key, value);
}

After:

if (Array.isArray(value)) {
  value.forEach((item) => {
    if (item != null) {
      urlSearchParams.append(key, String(item));
    }
  });
} else if (value != null) {
  urlSearchParams.append(key, String(value));
}

Test plan

• Added test for serializing 0 and false query params
• Added test for serializing empty string query params
• Added test for excluding null and undefined query params
• Added test for arrays with falsy values (e.g., [0, 1, 2])
• Added test for filtering null/undefined from array params
• All existing tests pass

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