Two bugs in the module-conflicts system:
1. warn() was called by the generated conflict block but never defined —
any conflict would crash with 'warn: command not found'.
Added warn() to helpers: dialog msgbox in interactive mode, logged
printf in answerfile mode.
2. Conflict patterns used substring globs (*"id"*) which caused
plymouth-custom to match the plymouth check — selecting only
plymouth-custom would trigger the conflict block, call the missing
warn(), and then remove plymouth-custom from SELECTED_APPS, leaving
no boot splash running at all.
Fixed by padding SELECTED_APPS with spaces and using *" id "* word-
boundary patterns in both the condition and the removal substitution.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>