notepat-remote: square pads + notepat.mjs shake/shadow labels
Pad cells now sized at min(colW, rowH) so the buttons stay square no
matter the device width; grid centers horizontally, extra vertical
space falls below (reserved for future readouts).
Labels get the notepat.mjs treatment: per-pad jitter while held (+brief
decay on release) plus a 1px drop shadow (auto-inverted for dark vs
light label colors) so the typography pulses with each strike.
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