[nococn]

Summary

Adds __test__/utils-query-options.test.ts covering previously untested Utilities.queryOptions() paths (src/utils.ts line coverage 55% -> 83%):

• Valid from/to date range: UTC conversion and derived days (timezone-independent assertions)
• Invalid ranges fall back to days=31: from after to, future dates, only one of from/to given
• days validation: in-range value kept, out-of-range (>90) and non-numeric fall back to 31
• radius clamped to [0, 16], height clamped to [200, 600], and their defaults (0 / 420)
• area, grid, hide_title boolean parsing
• hide_border: true yields transparent border color 0000
• title_color falls back to the custom color when not set separately
• custom_title is only set when provided

Verification

• New file: 10/10 tests pass
• Full suite: 18/19 pass; the single failure (GET /graph with correct credential expecting a Cache-Control header) fails identically on a clean checkout in this environment - it requires network access to the GitHub API and is unrelated to this change