chore: bump version to v2026.4.379 and fix dialog/shared-state issues}
- Bump version from v2026.4.377 to v2026.4.379 in package.json and README.md
- Use PLAYWRIGHT_BASE_URL env variable with /ng base path fallback in playwright config
- Sync group mode state to localStorage on restore so React can read it in Electron
- Remove overflow:hidden from dialog overlay pane to fix clipping
- Change max-height from none to inherit on dialog surface and container for proper flex sizing