fix(fields): fix NETWORKDAYS for reverse dates and time components [CLK-563323]

[mysza]

Summary

Fixes two bugs in the NETWORKDAYS formula (via formulajsProxy) that caused incorrect results for ClickUp formula custom fields:

• Reverse direction (start > end): formulajs day-counting loop never runs when days <= 0, returning 0 or wrong values instead of a negative working-day count. Excel/Sheets returns the negation of the forward count.
• Time-of-day on Date objects: formulajs uses Math.round on the ms difference between dates, so time components cause fractional results (e.g. 2.08 instead of 3) and off-by-one errors. Excel/Sheets ignores time-of-day entirely.

Fix

• Strip time from Date inputs before passing to formulajs (strings and serial numbers are unaffected — formulajs.parseDate handles those correctly)
• When the forward call returns <= 0, compute the reverse and negate to match Excel behavior

Examples

Formula	Before	After	Excel
NETWORKDAYS("2013-12-05", "2013-12-04")	0	-2	-2
NETWORKDAYS("2013-12-05", "2013-11-04")	-23	-24	-24
NETWORKDAYS(Aug7 23:00, Aug9 01:00)	2.08	3	3

Test plan

• Added reverse-direction tests (mirrors of existing forward tests)
• Added time-component tests using callVariable to inject Date objects with time-of-day
• Verified all 48 date-time tests pass
• Verified existing forward-direction NETWORKDAYS tests still pass

PRs in the Stack

• ➡ fix(fields): fix NETWORKDAYS for reverse dates and time components [CLK-563323] #35

(The stack is managed by git-grok.)

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