feat: contain Security Center focus (Closes #1136)

tests/e2e/test_mobile_home_bootstrap_release.py

@@ -170,6 +170,25 @@ def test_release_artifact_bootstraps_mobile_home_and_returns_from_insights(
             page.locator("#active-devices").click()
             expect(page.locator("#active-devices-sheet")).to_be_visible()
             expect(page.locator("#security-activity-section")).to_be_visible()
+            expect(page.locator("body > header")).to_have_attribute("inert", "")
+            expect(page.locator("main")).to_have_attribute("inert", "")
+            expect(dock).to_have_attribute("inert", "")
+            expect(page.locator("#close-active-devices")).to_be_focused()
+            expect(page.locator("#active-devices-status")).to_contain_text("active device")
+            expect(page.locator("#enrolled-passkeys-status")).not_to_contain_text("Loading")
+            page.keyboard.press("Shift+Tab")
+            assert page.evaluate(
+                """
+                () => {
+                  const controls = [...document.querySelector('#active-devices-sheet').querySelectorAll(
+                    'button:not([disabled]), select:not([disabled]), input:not([disabled]), textarea:not([disabled]), a[href], [tabindex]:not([tabindex="-1"])'
+                  )].filter(control => !control.hidden);
+                  return document.activeElement === controls.at(-1);
+                }
+                """
+            )
+            page.keyboard.press("Tab")
+            expect(page.locator("#close-active-devices")).to_be_focused()
             security_nav = page.locator(".security-section-nav")
             expect(security_nav).to_be_visible()
             for control in security_nav.locator("button").all():
@@ -179,9 +198,15 @@ def test_release_artifact_bootstraps_mobile_home_and_returns_from_insights(
             expect(page.locator("#security-section-devices")).to_have_attribute("aria-current", "page")
             page.go_back()
             expect(page.locator("#security-section-activity")).to_have_attribute("aria-current", "page")
+            expect(page.locator("body > header")).to_have_attribute("inert", "")
+            expect(page.locator("main")).to_have_attribute("inert", "")
+            expect(dock).to_have_attribute("inert", "")
             page.go_back()
             expect(page.locator("#active-devices-sheet")).to_be_hidden()
             expect(page.locator("#active-devices")).to_be_focused()
+            expect(page.locator("body > header")).not_to_have_attribute("inert", "")
+            expect(page.locator("main")).not_to_have_attribute("inert", "")
+            expect(dock).not_to_have_attribute("inert", "")
 
             assert len(workspace_requests) == 1, workspace_requests
             assert page.evaluate("document.documentElement.scrollWidth <= window.innerWidth")