Description: Remove unused shader helpers left after refactor and restore probe visibility for grid vs watermark cost (without changing current visual behavior).
Acceptance: No unused-element warnings in touched files; probe still distinguishes relevant background costs.
Description: Remove unused shader helpers left after refactor and restore probe visibility for grid vs watermark cost (without changing current visual behavior).
Acceptance: No unused-element warnings in touched files; probe still distinguishes relevant background costs.
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Description: Remove unused shader helpers left after refactor and restore probe visibility for grid vs watermark cost (without changing current visual behavior).
Acceptance: No unused-element warnings in touched files; probe still distinguishes relevant background costs.