feat: enhance embed block resizing, improve bookmark viewMode reactivity, and redesign tests panel UI
- Fixed bookmark block viewMode not updating on block changes by converting to setter/getter pattern with cached property
- Enhanced embed block with persistent resize handles using opacity transitions instead of DOM changes to prevent iframe flashing
- Improved YouTube URL handling to support watch, youtu.be, shorts, and embed formats with normalized embed URLs
- Added iframe permissions (
- Added settings UI to enable/disable .bak file creation when saving files
- Created settings storage in .obsidian/obsiviewer.json to persist backup preferences
- Added API endpoints to read/write backup settings (/api/settings)
- Implemented automatic cleanup of existing .bak files when disabling backups
- Modified file save operations to respect backup setting across notes, bookmarks and graph files
- Removed existing .bak files from version control
