Prairie v1.2.1 — logout fix + tab slide

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A small fix-and-polish release on top of v1.2.0.

Fixed

• Logout crash. Clicking Log out threw Cannot read properties of null (reading conn_id). The v1.2.0 route cross-fade keeps the workspace mounted during its exit animation, by which point the store connection is already null. The workspace and document browser now read the connection defensively (and gate their queries on a live connection), so logout animates out cleanly.

Added

• A subtle slide transition when switching the Documents / Indexes / Import-Export tabs — honors prefers-reduced-motion like the rest of the motion system.

No protocol change (still wire protocol v2); the dark amber-on-neutral theme is unchanged.

Downloads

• BisonDB.Prairie_1.2.1_x64-setup.exe — NSIS installer (recommended)
• BisonDB.Prairie_1.2.1_x64_en-US.msi — MSI installer
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