Chapter Diff 0.3.0

What changed

• Chapter Diff now opens in the note’s existing tab instead of creating a side split.
• Obsidian navigation can return directly to the normal note view.
• The comparison now uses editor typography, line numbers, and Obsidian Git-style red and green highlighting.
• Long unchanged ranges appear as purple-accented “unchanged lines” bars.
• Clicking an unchanged-lines bar expands the hidden content in both columns.
• The toolbar is now compact and leaves more room for the manuscript.