Fix sidebar startup layout & add configurable Gnomon node

Fixed initial UI layout issue by aligning sidebar default state in main.js

Sidebar now starts collapsed with correct BrowserView bounds (no reserved space)

Added support for applying a custom Gnomon daemon RPC node at runtime

Introduced configurable --daemon-rpc-address instead of hardcoded value

Ensured Gnomon restarts safely when node is changed

Improved startup UX by removing need for manual sidebar toggle

Full Changelog: v0.49.7...v0.49.84