Issue #7902 : Document field format metadata, Script result, and date time zones

[mattcasters]

Summary

• Add a canonical Formatting numbers and dates page for Format, Length, Precision, Decimal, Group and Currency, plus string-to-date / date-to-string conversion, time zones, and DST gap/overlap hours (the missing hour and the doubled hour).
• Document the Script transform Script result? column (return value of the last expression vs a named variable) and the Row Generator Value / Group columns (single constant; thousands separator, not a row group).
• Link every transform and metadata page that already uses these columns, extract the old Text File Input format tables into reusable snippets, and retire the unused columninfo-wiget-defaults draft.
• Add column-header tooltips on Script, Row Generator, Get Variables, Add Constants, and Google Sheets Input.

Fixes #7902

Test plan

• Compile tooltip modules (core, Script, Row Generator, Get Variable, Add Constants, Google Sheets)
• Spotless apply on changed Java modules
• Grep: no leftover Java 1.4.2 format-API links; unused columninfo-wiget-defaults removed
• Read formatting-values, Script, Row Generator, JavaScript, Select Values, and Text File Input pages end to end
• Local Antora preview of the new page and a few xrefs (not run here)
• Hover Script Script result? and Row Generator Group / Value column headers in Hop Gui