Action buttons sized to text + 8 px padding made "Undo" end up
~46 x 33 px — fine for a mouse but at the threshold of a finger.
Adds `min_width: 48 px` and `min_height: 48 px` to the button
Node so every button meets Material's 48 dp thumb-target guideline.
Applied universally; the floor is a no-op for buttons whose
content already exceeds 48 px on either axis (Menu, Modes,
New Game, Pause, Help all clear 48 px wide; height was the
binding constraint at ~33 px).
Closes P1 #2 of docs/android/PLAYABILITY_TODO.md. Engine tests
pass; clippy clean.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
funman300
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