Library, Notes, and the other floating tool windows (Tasks, Calendar,
Gallery, Email, Cookbook, Brain, Settings, Theme, Compare, Research,
Sessions) could be moved and snapped but never resized — there were no
resize handles and dragging the edges did nothing.
Add a shared makeWindowResizable() helper and wire it into the existing
makeWindowDraggable() so every draggable window gains native-style
edge/corner resizing from one place:
- Grab any of the four edges or four corners to resize; the cursor
reflects the active handle (ew/ns/nwse/nesw-resize).
- Detects pointer proximity to the border instead of injecting handle
elements, so it works regardless of each window's overflow model
(.modal-content scrolls its body; .notes-pane scrolls an inner el).
- Min-size clamp (320x200) and viewport clamping so a window can't be
collapsed to nothing or dragged off-screen.
- Per-window size is remembered and restored on reopen.
- Disabled on mobile (windows are full-screen sheets there) and while a
window is docked or fullscreen-snapped.
- Touch supported at tablet width and up; self-heals a missed pointer-up
so a lost mouseup can't leave a window stuck in resize mode.
