A focus step cost a fixed 180pt of pan travel regardless of what was
focused, so small controls felt sluggish and large cards hair-triggered
compared with the native focus engine, which prices a step by on-screen
geometry. Derive per-axis thresholds from the focused control's rect
(gain 1.1, clamped 100-360pt) and normalize axis resolution by them, so
a wide-flat tile steps vertically once the finger covers its height.
Focus scopes, the player's screen-sized catch-all surfaces, and nodes
without layout fall back to the fixed threshold, keeping player chrome
behavior unchanged.
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