A package browser, and a side strip that grows with the window

Finding something to install meant already knowing its name, and then
finding out the hard way whether it was any use as blocks.

Packages > Browse packages opens a shelf of about eighty five libraries,
each with a plain description and an honest note about how well it suits
block programming: ready made blocks, fits nicely, opens a window of its
own, needs hardware plugged in, or hard to use as blocks at all. Anything
already installed, or already turned into blocks, is marked as such.

Type any name and Look it up on PyPI fetches the real description, version
and requires-python from pypi.org, works out whether the Python you are
using can actually run it, and warns when a package ships no built files so
pip would need build tools. That answer arrives before installing rather
than after.

The category strip down the side now grows a little on a bigger window,
capped so it never becomes silly, and the drawer starts wider to match.
Package block names are long, and on a large screen they were being cut off.

Version 1.4.0.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: ZDStudios

README.md

@@ -177,6 +177,29 @@ colour so your palette never turns into soup.
 <img src="docs/screenshot-packages.png" width="900" alt="The package dashboard">
 </div>
 
+### A shelf to browse
+
+<div align="center">
+<img src="docs/screenshot-packagebrowser.png" width="900" alt="The package browser">
+</div>
+
+**Packages → Browse packages** opens a shelf of around 85 libraries worth
+trying, each with a plain description and an honest note about **how well it
+fits block programming**:
+
+| | |
+|---|---|
+| **Ready made blocks** | ScratchPy has hand-written blocks for it |
+| **Fits nicely** | its functions turn into blocks cleanly |
+| **Opens a window** | works, but draws in a window of its own |
+| **Needs hardware** | works, but wants a device plugged in |
+| **Hard to use as blocks** | installs fine, but its ideas do not map well |
+
+Anything already installed, or already turned into blocks, is marked. Type any
+name at all and **Look it up on PyPI** fetches its real description, version and
+`requires-python`, and tells you whether **your** Python can run it — so you
+find out before installing, not after.
+
 * Popular libraries (**requests, numpy, pandas, matplotlib, pillow, pygame,
   turtle**) also get hand-written, friendlier blocks.
 * Any importable module works — including standard library ones like `turtle`