Fix CI: rebuild better-sqlite3 for Node.js before running tests

postinstall runs @electron/rebuild which compiles native modules for
Electron, but vitest runs on plain Node.js with a different
NODE_MODULE_VERSION. Adding npm rebuild before tests fixes the mismatch.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ozgesolidkey

.github/workflows/ci.yml

@@ -31,6 +31,9 @@ jobs:
       - name: Type check
         run: npm run typecheck
 
+      - name: Rebuild native modules for Node.js (tests run on Node, not Electron)
+        run: npm rebuild better-sqlite3
+
       - name: Run tests
         run: npm test