fix(desktop): guard shutdown race and kill sidecar process tree

bun.lock

@@ -13,6 +13,9 @@
     "apps/desktop": {
       "name": "@furtherverse/desktop",
       "version": "1.0.0",
+      "dependencies": {
+        "tree-kill": "catalog:",
+      },
       "devDependencies": {
         "@furtherverse/tsconfig": "workspace:*",
         "@tailwindcss/vite": "catalog:",
@@ -118,6 +121,7 @@
     "react-dom": "^19.2.4",
     "systeminformation": "^5.30.7",
     "tailwindcss": "^4.1.18",
+    "tree-kill": "^1.2.2",
     "turbo": "^2.7.5",
     "typescript": "^5.9.3",
     "uuid": "^13.0.0",
@@ -1244,6 +1248,8 @@
 
     "to-regex-range": ["to-regex-range@5.0.1", "", { "dependencies": { "is-number": "^7.0.0" } }, "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ=="],
 
+    "tree-kill": ["tree-kill@1.2.2", "", { "bin": { "tree-kill": "cli.js" } }, "sha512-L0Orpi8qGpRG//Nd+H90vFB+3iHnue1zSSGmNOOCh1GLJ7rUKVwV2HvijphGQS2UmhUZewS9VgvxYIdgr+fG1A=="],
+
     "truncate-utf8-bytes": ["truncate-utf8-bytes@1.0.2", "", { "dependencies": { "utf8-byte-length": "^1.0.1" } }, "sha512-95Pu1QXQvruGEhv62XCMO3Mm90GscOCClvrIUwCM0PYOXK3kaF3l3sIHxx71ThJfcbM2O5Au6SO3AWCSEfW4mQ=="],
 
     "tsconfck": ["tsconfck@3.1.6", "", { "peerDependencies": { "typescript": "^5.0.0" }, "optionalPeers": ["typescript"], "bin": { "tsconfck": "bin/tsconfck.js" } }, "sha512-ks6Vjr/jEw0P1gmOVwutM3B7fWxoWBL2KRDb1JfqGVawBmO5UsvmWOQFGHBPl5yxYz4eERr19E6L7NMv+Fej4w=="],