test(e2e): assert the EMCN composer and menu anatomy in the mobile suite

The platform composer contains its scroll at every width, so desktop now
asserts the same containment plus scrolling Home from beside the draft.
A menu row's accessible name carries its drawn shortcut hint, so Auto
layout is matched by its leading label.

Author: waleedlatif1

apps/sim/scripts/test-mobile-e2e.ts

@@ -785,23 +785,15 @@ async function exerciseViewport(
               await settle()
               const after = await heading.boundingBox()
               assert(after)
-              if (compactNavigation(width)) {
-                assert(
-                  Math.abs(after.y - before.y) <= 1,
-                  'Scrolling past a mobile draft must not move Home'
-                )
-                await page.mouse.move(width - 2, 300)
-                await page.mouse.wheel(0, 600)
-                await expect
-                  .poll(async () => (await heading.boundingBox())?.y ?? before.y)
-                  .toBeLessThan(before.y - 10)
-              } else {
-                await expect
-                  .poll(async () => (await heading.boundingBox())?.y ?? before.y, {
-                    message: 'Desktop scroll handoff must remain unchanged',
-                  })
-                  .toBeLessThan(before.y - 10)
-              }
+              // The composer contains its own scroll at every width; Home scrolls from outside it.
+              assert(Math.abs(after.y - before.y) <= 1, 'Scrolling past a draft must not move Home')
+              await page.mouse.move(width - 2, 300)
+              await page.mouse.wheel(0, 600)
+              await expect
+                .poll(async () => (await heading.boundingBox())?.y ?? before.y, {
+                  message: 'Scrolling beside the draft must move Home',
+                })
+                .toBeLessThan(before.y - 10)
               await capture(page, `${browserName}-${width}-draft-scroll`)
             } finally {
               await composer.fill('')
@@ -1426,9 +1418,8 @@ async function exerciseViewport(
             const bounds = await actions.boundingBox()
             assert(bounds)
             await page.touchscreen.tap(bounds.x + bounds.width / 2, bounds.y + bounds.height / 2)
-            await expect(
-              page.getByRole('menuitem', { name: 'Auto layout', exact: true })
-            ).toBeVisible()
+            // The row's accessible name ends with its drawn shortcut hint (⇧L).
+            await expect(page.getByRole('menuitem', { name: /^Auto layout\b/ })).toBeVisible()
             await page.keyboard.press('Escape')
           } else {
             const canvasBounds = await canvas.boundingBox()