v0.3.0

Commits since v0.2.0:
- docs: 0.3.0 release notes for printings, gallery art, and share links
- fix: satisfy BlobPart/gunzipSync ArrayBuffer typings
- fix: keep user gesture when copying a share link
- feat: share decks via a copy-paste URL fragment
- fix: keep every unique art for basic lands in printings
- fix: reserve 16 basic-land printings slots for borderless arts
- fix: keep classic basic-land arts in the printings carousel
- fix: widen portrait art tiles and match full-art crop ratio
- feat: split gallery art view into landscape and portrait wells
- feat: blur letterbox behind gallery art crops in a square well
- fix: always show the gallery lead hero even when its art crop is portrait
- feat: honor pinned printings on gallery heroes; fold printings into import
- feat: alternate art picker via side printings index
- fix: widen the trailing annotation gap to 1rem
- fix: spend the squeezed table width on name and type
- fix: pad the trailing row annotation like every other cell
- fix: give the trailing row annotation the gap, whichever one lands last