Root cause: the fallback lookup from opd_med_master used
$labelField = $masterSaltField ?? $masterGenericField
which preferred salt_name (the Substitute / other brand names field) over
genericname (the actual Generic Name / composition). If a prescription row's
inline genericname was empty, the Substitute string was written into it and
then printed as \"Salt/Generic\" in the {{medical}} block.
Fixes applied in three places:
1. Opd.php buildOpdLetterPrintData - master lookup now prefers genericname
2. Opd.php buildOpdLetterPrintData second loop - removed inline salt_name
fallback that overwrote genericname with Substitute value
3. Opd.php buildLegacyDashboardTemplateVars - removed salt_name from the
generic resolution chain used when rendering the medicine table HTML
4. Opd_prescription.php medicine list function - same preferGenericname fix
and removed inline salt_name -> genericname overwrite"
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