fix(ui): stabilize backend lifecycle tests

core/http/react-ui/e2e/backends-installed-node-removal.spec.js

@@ -407,15 +407,19 @@ for (const beforeConfirm of [false, true]) test(`generic deletion blocks targete
   if (beforeConfirm) {
     await clearTarget(page); await genericRemove(page).click()
     await expect(page.getByRole('alertdialog')).toBeVisible()
-    // Start the targeted request through its captured React handler while the
-    // existing generic confirmation remains open.
+    // Restore the target while the existing generic confirmation remains open.
     await page.evaluate(id => {
       const url = new URL(location.href); url.searchParams.set('target', id)
       history.pushState({}, '', url); dispatchEvent(new PopStateEvent('popstate'))
     }, ids[0])
   }
+  // The generic and targeted buttons share a name; the URL can update before
+  // React replaces the generic control. Wait for the exact targeted handler.
+  await expect(reinstall(page)).toHaveAttribute('title', `Reinstall on ${ids[0]}`)
+  await expect(reinstall(page)).toBeEnabled()
   await reinstall(page).evaluate(el => el.click())
   await expect.poll(() => s.installs.length).toBe(1)
+  expect(s.installs).toEqual([{ id: ids[0], method: 'POST', body: { backend: BUILD } }])
   if (beforeConfirm) {
     await confirm(page).click()
     await expect(page.getByRole('alertdialog')).toBeHidden()

core/http/react-ui/e2e/canonical-resource-navigation.spec.js

@@ -1,5 +1,13 @@
 import { test, expect } from './coverage-fixtures.js'
 
+async function backendInventory(page, installed) {
+  await page.route('**/api/backends?*', route => route.fulfill({ json: {
+    backends: [{ id: 'llama-cpp', name: 'llama-cpp', installed: true }],
+  } }))
+  await page.route('**/api/backends/upgrades', route => route.fulfill({ json: {} }))
+  await page.route('**/backends', route => route.fulfill({ json: installed }))
+}
+
 function urlState(page) {
   const url = new URL(page.url())
   return { path: url.pathname, params: url.searchParams }
@@ -22,9 +30,14 @@ test.describe('Canonical resource navigation', () => {
   })
 
   test('redirects legacy backend management state including visibility flags', async ({ page }) => {
+    // The installed view clears selections absent from its inventory.
+    await backendInventory(page, [{ Name: 'llama-cpp', IsSystem: false }])
     await page.goto('/app/manage?tab=backends&sel=llama-cpp&bq=llama&bf=user&bv=1&bd=1')
 
-    await expect.poll(() => urlState(page).path).toBe('/app/backends')
+    const row = page.locator('[data-entity="llama-cpp"]')
+    await expect(row).toBeVisible()
+    await expect(row).toHaveAttribute('data-selected', 'true')
+    await expect(page).toHaveURL('/app/backends?view=installed&backend=llama-cpp&q=llama&state=user&show_all=1&development=1')
     const state = urlState(page)
     expect(state.params.get('view')).toBe('installed')
     expect(state.params.get('backend')).toBe('llama-cpp')
@@ -34,6 +47,14 @@ test.describe('Canonical resource navigation', () => {
     expect(state.params.get('development')).toBe('1')
   })
 
+  test('clears a missing installed backend selection without losing URL refinements', async ({ page }) => {
+    await backendInventory(page, [])
+    await page.goto('/app/backends?view=installed&backend=llama-cpp&q=llama&state=user&show_all=1&development=1&target=worker-alpha')
+
+    await expect(page).toHaveURL('/app/backends?view=installed&q=llama&state=user&show_all=1&development=1&target=worker-alpha')
+    await expect(page.locator('[data-entity="llama-cpp"]')).toHaveCount(0)
+  })
+
   test('defaults legacy management links to Installed Models', async ({ page }) => {
     await page.goto('/app/manage')