fix: disable GPU sandbox on Linux to prevent fatal GPU process crash

Fixes freeze/crash on AMD GPUs under CachyOS. Also fixes Discord RPC
branding to say Sanctum instead of Stoat.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/main.ts

@@ -8,6 +8,12 @@ import { initTray } from "./native/tray";
 import { checkForUpdates } from "./native/updater";
 import { BUILD_URL, createMainWindow, mainWindow } from "./native/window";
 
+// Linux GPU sandbox causes fatal crash on some AMD/CachyOS setups
+if (process.platform === "linux") {
+  app.commandLine.appendSwitch("disable-gpu-sandbox");
+  app.commandLine.appendSwitch("disable-software-rasterizer");
+}
+
 // Squirrel-specific logic
 // create/remove shortcuts on Windows when installing / uninstalling
 // we just need to close out of the app immediately

src/native/discordRpc.ts

@@ -19,10 +19,10 @@ export async function initDiscordRpc() {
         state: "mithraic.space",
         details: "Chatting with others",
         largeImageKey: "qr",
-        largeImageText: "Join Stoat!",
+        largeImageText: "Join Sanctum!",
         buttons: [
           {
-            label: "Join Stoat",
+            label: "Join Sanctum",
             url: "https://mithraic.space/",
           },
         ],