rexmod v0.1.5

Added

• Media previews in the editor: images and PDFs open as pictures, videos show their first frame (Space u o plays them in the macOS app), and markdown renders in place (Space c p opens a live browser preview).

Fixed

• Rex's own "Check for Updates…" now runs rexmod's update.sh (official build, checked, then patched) and reports the result, and Rex's "Checking for updates" status clears afterwards, instead of starting Sparkle and ending in "Update failed".
• Images in the editor pane stayed black: Neovim 0.12 runs its screen in a separate process, and the image plugin's nvim_ui_send writes never reached Rex. In Rex they now go straight to the pane's terminal.
• An image stayed on screen after you switched to another buffer; it's now removed when its buffer leaves the window.