build: configure multi-entry Vite build for reader

- Add reader.ts as second entry point alongside main.ts in vite.config.ts
- Set assetsDir to empty string to output chunks to /static/ root
- Remove reader-shell import from main.ts (loaded separately via reader.js)
- Update .gitignore to exclude web/static/assets/*.js chunks
- Update Bruno environment with new test IDs

web/src/main.ts

@@ -27,7 +27,6 @@ import "./password_validation";
 import "./profile";
 import "./profile-modal";
 import "./queue";
-import "./reader/reader-shell";
 import "./register";
 import "./search";
 import "./storage";