fix(e2e): rebuild better-sqlite3 per ABI + select inbox window by title

- Vitest needs the node-ABI prebuilt sqlite binary; Electron 41 needs ABI 145.
  Add `rebuild:node` / `rebuild:electron` scripts and wire them as
  pre-hooks for `test`, `test:e2e`, `start`, `dev`, `test:integration`.
- Smoke test was racing on `firstWindow()`, which non-deterministically
  returned the quickcapture window. Strip ELECTRON_RUN_AS_NODE from the
  launch env, wait for both windows to register, then pick the inbox by
  title and assert the heading via `getByRole`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -7,6 +7,13 @@
     "dev": "electron-vite dev",
     "build": "electron-vite build",
     "start": "electron-vite preview",
+    "rebuild:node": "cd node_modules/better-sqlite3 && prebuild-install",
+    "rebuild:electron": "cd node_modules/better-sqlite3 && prebuild-install --runtime=electron --target=41.3.0",
+    "pretest": "npm run rebuild:node",
+    "pretest:integration": "npm run rebuild:node",
+    "pretest:e2e": "npm run rebuild:electron && npm run build",
+    "prestart": "npm run rebuild:electron",
+    "predev": "npm run rebuild:electron",
     "test": "vitest run",
     "test:watch": "vitest",
     "test:integration": "INKLING_INTEGRATION=1 vitest run tests/integration",