test(theme-studio): pin lock behaviors with a #locktest gate

Adds a browser hash gate covering the two lock behaviors no existing gate touched: locking a row disables its control (syntax swatch div via data-locked, UI select via .disabled, both through the shared mkLockCell), and clear-unlocked wipes unlocked rows to default while leaving locked rows untouched across all three tiers. This is the characterization net for the generate.py extraction refactor — it proves the upcoming CSS/JS move preserves lock behavior. Verified it goes red when a lock guard is removed.

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