feat: extend math engine: currencies, timezones, finance, cooking#715

Merged

antonreshetov merged 33 commits intomainfrom

feat/math-new-features

Mar 29, 2026

Commits on Mar 29, 2026

feat(math): add workday calculations
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feat(math): add timestamps and ISO 8601 support
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feat(math): add timezone extensions — airport codes, countries, date in, time difference
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feat(math): add timespan, laptime formats and shorthand time input
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feat(math): add clock time intervals
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fix(math): use absolute value for 'time difference between' phrases
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fix(math): preserve sign in timezone difference (matches Soulver behavior)
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fix(math): correct timezone difference sign for 'between' phrases
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test(math): add timezone difference sign verification tests
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test(math): add comprehensive edge case tests from audit
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feat(math): add misc phrase functions
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feat(math): add video timecode and frame rate support
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feat(math): add financial calculations
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feat(math): add base N conversion and Python-style hex/bin/int
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feat(math): add large number symbols and comment extensions
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feat(math): add cooking calculations with substance density database
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feat(math): extend currencies to 166 fiat + 21 crypto + prefix symbols
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test(math): add comprehensive fixture documents for visual testing
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fix(math): use user locale for timezone date formatting
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feat(math): unify date formatting with configurable dateFormat setting
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feat(math): add date format setting and currency/crypto refresh buttons
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fix: use shadcn Button import in Math preferences
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fix: match Button style with other preferences (remove size=sm)
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fix: unify currency/crypto rate descriptions in preferences
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fix: restore rate limit info in crypto description
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fix: clean up currency/crypto rate descriptions
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fix(math): use fixed notation for unit formatting to avoid scientific notation
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feat(math): support total/sum for unit results (currency, same units)
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fix(math): set numericValue for unit results so TOTAL works in UI
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fix: address 5 review findings
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fix(math): address review fixes for rates and cooking locale
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refactor(test): split useMathEngine tests into domain-based files
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test: add real-world math engine scenarios
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