Improve New Highlight Sync Behavior

[Comprehensive-Jason]

• insert new highlights into existing imported notes WITHOUT messing up the formatting of the existing content. This could be done by:

  • storing a unique Readwise ID for each note in their YAML frontmatter to prevent duplicates
  • marking the import area in each note with the following, making sure that new highlights are only inserted between the comments while preserving the rest of the note:

%% start highlight section %%
import highlights here
%% stop highlights section %%