L17: TemplateManager urlPattern field now validates the regex on each keystroke;
an error message appears below the input and Save is blocked until fixed.
L18: Terminal nav item is hidden when customCommandEnabled is false -- no more
dead-end gated view. Sidebar gains showTerminal prop; App.tsx reads the
setting and passes it through.
L56: SponsorBlock Categories Field shows a 'warning' validationMessage when the
toggle is ON but no categories are selected, making the silent no-op visible.
typecheck + 242 tests + eslint + prettier green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
debont80
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