Add settings tab with toggle to reveal blurred/boned text on hover,
removing the dependency on obsidian-style-settings plugin. Also fix
CSS selectors that were looking for descendant instead of class on body.
- Add BlurPluginSettings interface and PluginSettingTab
- Fix hover CSS selectors (body .class → body.class)
- Update README with settings section and method behavior notes
- Fix inline content extraction bug (substring → slice)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>