PopoverMenu's toggle mode renders the trigger label from whichever
item has `selected: true` — and AspectRatioPicker only marks an item
selected when `useAspectRatio === ratio` for some ratio in
`model.aspectRatios`. When the user picks an aspect ratio supported
by model A and then switches to model B that doesn't include it,
no item matches, the trigger has no label, and the aspect-ratio text
silently disappears.
Add an effect that, on every `selectedImageModel` change, resets
`commonAspectRatio` to the new model's default if the current pick
isn't in the new model's `aspectRatios`. Routes through
`handleCommonAspectRatioSelect` so the editor letterbox follows the
reset (the user's pick was unrenderable on this model anyway, so the
fallback is correct here — distinct from the cold-load case).
Tanish Manku
6c23ce16dd