test(e2e): Playwright smoke test — boot tier always, E2EE composer tier with credentials

Boot tier (runs against vite preview of dist/): login screen renders with
no page or console errors, sw.js is served and registers, the bundled
Element Call mounts in a frame with no failed asset requests. E2EE tier
(skipped without E2E_HOMESERVER/E2E_USER/E2E_PASSWORD): password login,
create an encrypted room, send text, attach a compressed JPEG, and assert
at the network level that every send is m.room.encrypted with no
plaintext body/url/file — the regression test #6/#7/#11 lacked.
Secrets and local usage documented in LOTUS_TESTING.md.

Fixes #90

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

e2e/tsconfig.json

@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "noEmit": true,
+    "lib": ["ES2022", "DOM"],
+    "types": ["node"]
+  },
+  "include": ["./**/*.ts", "../playwright.config.ts"]
+}