v0.10.0

Added

• Resizable overlay panes. The folder tree and preview panes are now drag-resizable
  via thin gutters on either side of the file grid — widen the tree for long folder names,
  or trade preview width for grid space. Sizes persist per browser in localStorage, and
  double-clicking a gutter resets that pane to its default (tree 200px / preview 34%).
  Min-width clamps keep every pane usable (tree ≥120px, preview ≥160px, grid ≥200px) so
  nothing collapses. The middle grid stays fluid and auto-reflows its thumbnail columns.
  Frontend-only — a focused web/resize.js module, no backend changes, no new settings.