feat(web): add workspace-aware session flow

vitest.web.config.ts

@@ -1,10 +1,10 @@
 import tsconfigPaths from 'vite-tsconfig-paths'
 import { defineConfig } from 'vitest/config'
 
-// Web smoke lane (GUI, gate-exempt — not part of the CI sequence yet): built
-// page + real chromium, so it lives outside the unit/e2e includes. The
-// real-host test self-skips without DEEPSEEK_API_KEY; the fixture test is
-// keyless and deterministic.
+// Web smoke lane (GUI, gate-exempt — not part of the CI sequence yet): real
+// host entry points plus built-client interaction snapshots, outside the
+// unit/e2e includes. Real-model cases self-skip without DEEPSEEK_API_KEY;
+// fixture branches stay keyless and deterministic.
 try {
   // Node >= 21.7 native; throws when the file does not exist.
   process.loadEnvFile(new URL('.env', import.meta.url).pathname)
@@ -18,7 +18,10 @@ export default defineConfig({
   // workspace imports to source like every other lane.
   plugins: [tsconfigPaths({ projects: ['./tsconfig.base.json'] })],
   test: {
-    include: ['apps/web/tests/**/*.e2e.ts'],
+    include: [
+      'apps/web/tests/**/*.e2e.ts',
+      'apps/web/tests/**/*.snapshot.ts',
+    ],
     // Browser boot + real-model turns are slow; files share one browser, run serial.
     testTimeout: 180_000,
     hookTimeout: 120_000,