(v0.4.1) Minor Update

Better navigation and smoother file handling.

• Outline cursor tracking — the outline highlights the section your cursor is in — and its ancestor chain (section → subsection → paragraph) — live as you move around the document, so you always know where you are.
• Drag & drop — drop .tex files from Finder onto the editor to open them as tabs, and drag tabs to reorder them.
• File association — open .tex files in texspark straight from Finder (double-click / Open With).
• Minor bug fixes — assorted stability and polish fixes.