Overflow check

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Overflow is flagged three ways: ↕/↔ = content past the slide edge (px and % of edge); ✂ cut = a clipping box (code well, fixed card) hides content; ⊟ spill = a box's content escapes its slot (a column/region taller than its space). The element is named in each. These are aspect ratios, not resolutions — the fit depends only on ratio (vmin type scale). The column layouts flip side-by-side ⇄ stacked at 3:2, so 3:2+/3:2- straddle that breakpoint — a discontinuity where the worst case often hides (a slide can pass 1:1 yet fail 4:3). Landscape (2:13:2+) is the real presentation band; 3:2-1:1 stack; portrait/phone are a sanity check.
Click a red cell to open that slide in a popup sized to that exact shape — the overflow reproduces live so you can see where it spills. Clicking the slide name opens it at its first failing shape.