fix(desktop): release profile backends before delete (#42613)

apps/desktop/electron/main.cjs

@@ -4295,20 +4295,31 @@ async function teardownPrimaryBackendAndWait() {
   const dying = hermesProcess && !hermesProcess.killed ? hermesProcess : null
   resetHermesConnection()
 
-  if (!dying) {
+  await waitForBackendExit(dying)
+}
+
+async function waitForBackendExit(child, timeoutMs = 5000) {
+  if (!child) {
+    return
+  }
+  if (child.exitCode !== null || child.signalCode !== null) {
     return
   }
 
   await new Promise(resolve => {
     const timer = setTimeout(() => {
       try {
-        dying.kill('SIGKILL')
+        if (IS_WINDOWS && Number.isInteger(child.pid)) {
+          forceKillProcessTree(child.pid)
+        } else {
+          child.kill('SIGKILL')
+        }
       } catch {
         // Already gone.
       }
       resolve()
-    }, 5000)
-    dying.once('exit', () => {
+    }, timeoutMs)
+    child.once('exit', () => {
       clearTimeout(timer)
       resolve()
     })
@@ -4500,12 +4511,70 @@ function stopPoolBackend(profile) {
   }
 }
 
+async function teardownPoolBackendAndWait(profile) {
+  const entry = backendPool.get(profile)
+  if (!entry) return
+  backendPool.delete(profile)
+
+  if (entry.process && !entry.process.killed) {
+    try {
+      entry.process.kill('SIGTERM')
+    } catch {
+      // Already gone.
+    }
+  }
+
+  await waitForBackendExit(entry.process)
+}
+
 function stopAllPoolBackends() {
   for (const profile of [...backendPool.keys()]) {
     stopPoolBackend(profile)
   }
 }
 
+function profileNameFromDeleteRequest(request) {
+  if (!request || String(request.method || 'GET').toUpperCase() !== 'DELETE') {
+    return null
+  }
+
+  const match = String(request.path || '').match(/^\/api\/profiles\/([^/?#]+)(?:[?#].*)?$/)
+  if (!match) {
+    return null
+  }
+
+  let raw = ''
+  try {
+    raw = decodeURIComponent(match[1])
+  } catch {
+    return null
+  }
+
+  const name = raw.trim()
+  if (!name) {
+    return null
+  }
+  if (name.toLowerCase() === 'default') {
+    return 'default'
+  }
+  return name.toLowerCase()
+}
+
+async function prepareProfileDeleteRequest(request) {
+  const profile = profileNameFromDeleteRequest(request)
+  if (!profile || profile === 'default' || !PROFILE_NAME_RE.test(profile)) {
+    return
+  }
+
+  if (profile === primaryProfileKey()) {
+    writeActiveDesktopProfile('default')
+    await teardownPrimaryBackendAndWait()
+    return
+  }
+
+  await teardownPoolBackendAndWait(profile)
+}
+
 async function startHermes() {
   // Latched-failure short-circuit: once bootstrap has failed in this
   // process, every subsequent startHermes() call re-throws the same error
@@ -5124,6 +5193,8 @@ ipcMain.handle('hermes:api', async (_event, request) => {
     return rerouted
   }
 
+  await prepareProfileDeleteRequest(request)
+
   const connection = await ensureBackend(request?.profile)
   const timeoutMs = resolveTimeoutMs(request?.timeoutMs, DEFAULT_FETCH_TIMEOUT_MS)
   const url = `${connection.baseUrl}${request.path}`