version 1.9.0

New features

• Group highlights by first-level chapter: each book can become a single note whose highlights are grouped under ## chapter headings, with a clickable table of contents at the top. Enable it in Formatting Options; works best with "Write highlights directly to vault files".

Fixes

• Linux: send the obsidian:// link through calibre's own env-sanitized URL handler (calibre.gui2.open_url) so it launches reliably from calibre's bundled environment. The old raw OS command (xdg-open/open/startfile) is now an optional "Advanced" override in Other Options.
• Settings dialogs: both the Formatting Options and Other Options windows are now freely resizable and their description text wraps instead of forcing the window too wide. Long descriptions live in a scroll area with the OK/Cancel buttons always visible.