GUI/OptionsDialog: Fix proxy input validation feedback (fixes #166)#182

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bigshiny90 wants to merge 3 commits intobitcoinknots:29.x-knotsfrom

bigshiny90:v29.1-optionsdialog-validation-fixes

Commits on Sep 25, 2025

GUI/QValidatedLineEdit: add validation control features and fix error highlighting
bigshiny90
committed
GUI/OptionsDialog: fix proxy field validation and checkbox handling
bigshiny90
committed
GUI/SignVerifyMessageDialog: remove unnecessary QValidatedLineEdit revalidation on theme change
bigshiny90
committed