SolidCraft 0.23.0b for Android

SolidCraft 0.23.0b for Android (SolidCraft 0.23.0, port release b).

New in this release: ribbon menus taller than the screen now scroll with a finger. On a foldable's inner screen, Model › Create ran past the bottom and couldn't be scrolled by touch, so Gear (and Boss, Lip, Snap Fit, Rest, Frame Member) looked missing; drag the list up to reach them. A mouse still drags a menu row onto the ribbon to pin it. Helical threads are in Create › Thread: tick Modeled, then set Geometry to Helical B-rep. Tested end to end on a Galaxy Z Fold, with screenshots in the gears and threads guides. Known issues and what the next release fixes: docs/android-known-issues.md.

Built from upstream SolidCraft v0.23.0 (7770f898) with the Android port on top.

Install: download SolidCraft-0.23.0b-android-arm64.apk on an Android 8.0+ phone or tablet (arm64) and open it, allowing installs from that source; or adb install -r SolidCraft-0.23.0b-android-arm64.apk. Signed with a development key: uninstall a build from elsewhere first if Android refuses to update it.

Works: the full SolidCraft app (sketches, features, the timeline, the Render workspace) on Vulkan or GLES; mouse and keyboard as on the desktop (hover, selection, navigation buttons, wheel, right-click menu, shortcuts); touch (one finger orbits, tap selects, two fingers pan, pinch zooms, a finger drags a dialog's arrows); Back closes what is open; open, save, import and export through Android's file picker (STEP, STL, 3MF and OBJ tested); the on-screen keyboard for typing. Port-only: helical B-rep, custom and clearance threads (docs/android-threads.md) and involute gears: spur, helical, herringbone, internal, rack, bevel, miter, worm, worm wheel, crossed helical (docs/android-gears.md). The port saves designs one file format past upstream's release, so upstream's releases ask to be updated instead of opening them; export STEP to share.

Not yet: the on-screen keyboard covers the lower half of the screen (the app doesn't move above it), the phone layout is usable but cramped (best on a tablet or a foldable's inner screen), autosave recovery. Known issues, with work-arounds: docs/android-known-issues.md. How to use it: docs/android-touch.md; details: docs/android.md.