fix(web): carry the merged master through the add-workspace helper

Master gained a web-search e2e scenario that calls connectFreshWorkspace
with the pre-change one-argument signature, which fails to compile against
the test-merge commit CI builds. Give it the scaffold's workspace root like
every other scenario.

Master also gained the first-run welcome notice. The shared scaffold
acknowledges it before boot, but the W5 smoke spawns its own server against
a fresh $DSH_HOME, so its overlay owns pointer events and swallows the
first click on the workspace chip; the scenario now dismisses the notice
first. The notice is anchored structurally because this spec belongs to the
client TypeScript program, which does not reference the package owning its
copy.

apps/web/tests/smoke-real.e2e.ts

@@ -511,6 +511,16 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY || notReady.length > 0)('web smoke
 
   it('2+3 empty-state first send completes a real model round', async () => {
     onTestFailed(() => saveFailureShot(page, 'w5-first-round'))
+    // This scenario spawns its own server against a fresh $DSH_HOME, so the
+    // first-run welcome notice is unacknowledged and its overlay owns pointer
+    // events (the shared scaffold acknowledges it before boot instead). The
+    // notice is anchored structurally, not by its copy: this spec sits in the
+    // client TypeScript program, which does not reference the package that
+    // owns the strings.
+    const welcome = page.locator('[class*="onboardingOverlay"]')
+    await welcome.waitFor({ timeout: 15_000 })
+    await welcome.getByRole('button').click()
+    await welcome.waitFor({ state: 'detached', timeout: 15_000 })
     // Fresh world: connect a Workspace so the composer starts live.
     await connectFreshWorkspace(page, sessionsDir)
     const input = page.locator('textarea').first()

apps/web/tests/web-search-round.e2e.ts

@@ -109,7 +109,7 @@ describe('web e2e: shipped default web search', () => {
     tripwire = watchConsole(page)
     await page.goto(scaffold.baseUrl, { waitUntil: 'load' })
     await page.waitForSelector('[class*="frame"]', { timeout: 30_000 })
-    await connectFreshWorkspace(page)
+    await connectFreshWorkspace(page, scaffold.workspaceCwd)
   }, 120_000)
 
   afterAll(async () => {