feat(t3code-bin): add T3 Code desktop from the AUR

T3 Code is an open-source control plane for coding agents — Claude Code, Codex, OpenCode, Cursor and Grok driven from one desktop app, on the user's own subscriptions. Upstream ships a Linux x86_64 AppImage only, and the AUR's t3code-bin already tracks it, so this syncs from there in the fast ring.

One Omarchy patch: the AUR launcher runs Electron with --no-sandbox. Chromium falls back to a user-namespace sandbox when it finds no setuid helper, which is what happens on Arch, so the flag only turns the sandbox off. Verified both ways against the built package — sandboxed it reaches display setup, and only with namespaces restricted does it abort on the setuid helper.

🤖 Generated by Opus 5 in Claude Code.

pkgbuilds/t3code-bin/.omarchy/package.json

@@ -0,0 +1,5 @@
+{
+  "source": "aur",
+  "release_ring": "fast",
+  "upstream_commit": "4f0b415dccf7e3b0b85e2289e8c3a7c8603e9fb4"
+}

pkgbuilds/t3code-bin/.omarchy/patches/keep-chromium-sandbox.patch

@@ -0,0 +1,13 @@
+--- a/PKGBUILD
++++ b/PKGBUILD
+@@ -96,7 +96,9 @@
+   extra_flags+=(--ozone-platform-hint=auto)
+ fi
+ 
+-exec "$appdir/t3code" --no-sandbox "${extra_flags[@]}" "$@"
++# Omarchy: Chromium sandboxes itself with a user namespace when it cannot find a
++# setuid helper, which is the case on Arch, so --no-sandbox buys nothing here.
++exec "$appdir/t3code" "${extra_flags[@]}" "$@"
+ EOF
+ 
+   ln -s t3code "$pkgdir/usr/bin/t3-code-desktop"