README: refresh the screenshots and renders, add a Perspective Grid shot

- Five app screenshots retaken from the current build at 2240x1400 (UI at
  1.6x): the hero shows the Outer Glow settings in the Appearance panel, the
  Live Blends shot shows the new Layers panel rows, and a new shot shows a
  two-point Perspective Grid scene (examples/perspective-city.vectorcraft,
  built through the command API).
- "A look around" is a 2x2 grid; captions and alt texts follow the shots.
- The "Made in VectorCraft" art is re-rendered with vectorcraft-cli (the
  radial Repeat's gradients now turn with each instance).
- Every image is losslessly optimised with oxipng (7.2 MB -> 4.4 MB,
  pixel-identical).
- ASSETS.md rows for the new screenshot and example.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -40,7 +40,7 @@
 <br>
 
 <p align="center">
-  <img src="docs/images/shot-1-neon.png" alt="VectorCraft editing the Neon Drive poster: the title is selected, the Appearance panel shows its live Outer Glow, and the Properties panel shows its character settings" width="100%">
+  <img src="docs/images/shot-1-neon.png" alt="VectorCraft editing the Neon Drive poster: the title is selected, the Appearance panel shows the settings of its live Outer Glow, and the Properties panel shows its character settings" width="100%">
   <br><sub><b>Neon Drive</b>: a Pathfinder-cut sun, live Outer Glow on the type and grid, and clipping masks · <code>examples/neon-drive.vectorcraft</code></sub>
 </p>
 
@@ -63,8 +63,8 @@
 <table>
 <tr>
 <td width="50%" valign="top">
-  <img src="docs/images/shot-2-ribbons.png" alt="Three live blend ribbons of 55 to 70 steps with smooth colour, clipped to the artboard, with the Layers panel open" width="100%">
-  <p align="center"><sub><b>Live Blends</b>: editable key paths and smooth colour, clipped to the artboard</sub></p>
+  <img src="docs/images/shot-2-ribbons.png" alt="Three live blend ribbons clipped to the artboard, one selected with its key paths showing; the Layers panel lists the clip group, the blends and the selected blend's two key paths" width="100%">
+  <p align="center"><sub><b>Live Blends and Layers</b>: editable key paths, smooth colour, every object a row</sub></p>
 </td>
 <td width="50%" valign="top">
   <img src="docs/images/shot-4-bezier.png" alt="Direct Selection tool showing anchor points and Bézier handles on a crescent built with Pathfinder, with the contextual task bar below it" width="100%">
@@ -72,7 +72,11 @@
 </td>
 </tr>
 <tr>
-<td colspan="2" valign="top">
+<td width="50%" valign="top">
+  <img src="docs/images/shot-5-perspective.png" alt="Two lit building facades drawn on the left and right planes of a two-point perspective grid at sunset, with the Perspective Selection tool and the Plane Switching Widget" width="100%">
+  <p align="center"><sub><b>Perspective Grid</b>: art attached to its planes stays editable in perspective · <code>examples/perspective-city.vectorcraft</code></sub></p>
+</td>
+<td width="50%" valign="top">
   <img src="docs/images/shot-3-sheet.png" alt="Four artboards in the light UI theme: Pathfinder, Gradient Mesh, radial Repeat and Envelope Distort" width="100%">
   <p align="center"><sub><b>Multiple artboards, light theme</b>: Pathfinder · Gradient Mesh · live radial Repeat · Envelope Distort · <code>examples/feature-sheet.vectorcraft</code></sub></p>
 </td>