Update grok-bot to 0.30.0

[noctilust]

Bump Grok Bot from 0.29.0 to current Cursor stable 0.30.0.

Cursor now publishes a working linux-x64 sand update feed again. This release changes the Debian artifact filename from Grok_Bot_<version>.deb to grok-bot_<version>_amd64.deb, so this also keeps the manual updater aligned with the new feed and artifact layout.

Changes

• Pin https://downloads.cursor.com/grokbot/stable/2385d097738b3719cc5ecd9281a107aa106215f1/linux/x64/grok-bot_0.30.0_amd64.deb
• Update update-pkgver.sh to resolve linux-x64 directly and use the new Debian filename.
• Fix the updater's checksum substitution so it replaces the first sha256sums entry rather than the wrapper checksum.
• Keep the packaging layout, Wayland wrapper, desktop entry, icons, and /usr/bin/sand compatibility symlink unchanged.

Still edge-only. Linux desktop remains unofficial.

Tested

On Omarchy/Hyprland x86_64:

• Vendor .deb reports version 0.30.0; SHA-256 fb888b2204c8a51c71a9f5f9a2913ac10561f3ef6939c1245ecae4e837d4ada2.
• Ran update-pkgver.sh end-to-end twice; it resolves 0.30.0, commit 2385d097738b3719cc5ecd9281a107aa106215f1, the new .deb URL, and remains idempotent.
• makepkg --verifysource and makepkg pass.
• Package contains the wrapper, sand symlink, desktop entry, icons, and /opt/Grok Bot/grok-bot; no legacy sand.desktop.
• ldd found no unresolved libraries in the main executable or native modules.
• Isolated packaged-binary launch stayed up for 12 seconds: appVersion=0.30.0, crashSeen=false.
• Repository self-tests pass: sync-upstream, omarchy-pkgs, and omarchy-release.