db123 b900710196 fix: correct Jalali calendar year conversion ...

Complete rewrite of gregorianToJalali and jalaliToGregorian using
proper JDN arithmetic. Removed broken epoch offset (226899 / year 979)
and replaced with jalaliEpochJDN = 1948320 (March 21, 622 CE).

Verified: 2026-06-24 -> Jalali 1405-04-03 (correct)
Nowruz 1405 verified as 2026-03-21

2026-06-24 09:48:39 +03:30

6.0 KiB

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