Describe copy, rename and values in the list rows

- Pixel Art: copy button on layers and frames, rename by double
  click, opacity in the layer row. The fields below the list are
  gone.
- Tilemaps: copy, rename and Z in the layer row.
- Vector Art: copy and rename in the shape row.
- Development: check total 1272.

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

Development.md

@@ -13,7 +13,7 @@ npm run check        # typecheck + lint + format:check + tests, the gate CI runs
 npm run build        # writes dist/ and regenerates index.html
 ./build.sh           # the same under `set -o pipefail`, for callers that pipe the output
 php tools/make-user.php <name> <password>                     # an account; every tool signs in (see Accounts)
-node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 1266 editor checks, screenshots in /tmp/gm-e2e-*.png
+node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 1272 editor checks, screenshots in /tmp/gm-e2e-*.png
 GM_STEPS=20 node tools/e2e.mjs                                # or 1-12, or 6,20 — a subset while working on one step
 ./e2e.sh start [GM_STEPS]                                     # the same run detached, see below
 ./e2e.sh status                                               # live progress, or the last run's result

Pixel-Art.md

@@ -68,11 +68,18 @@ The **LAYERS** list shows the top layer first. Each row pictures its layer alone
 painted. A click on a row picks the layer the tools paint on.
 
 - **Dragging** a row moves the layer to another place in the drawing order.
-- The **eye** next to a row's ✕ leaves the layer out of the picture, and puts it back. A
-  hidden layer cannot be painted on.
-- The **+** in the list's header puts a new empty layer above the picked one. The **✕** at the right
-  end of a row takes that layer out. The last layer has no ✕, it stays.
-- **Name** and **Opacity** (0 to 1) edit the picked layer.
+- The **eye** in a row leaves the layer out of the picture, and puts it back. A hidden layer cannot
+  be painted on.
+- The **number** left of the eye is the layer's opacity in percent. Click it to type a value, or drag
+  it sideways to scrub (Shift ten times faster, Alt ten times slower). The canvas follows while you
+  drag, and the whole drag is one undo step.
+- A **double-click** on a layer's name edits it right in the row. Enter or a click elsewhere keeps
+  it, Esc goes back. A blank name is not taken.
+- The **+** in the list's header puts a new empty layer above the picked one.
+- The **copy mark** (two squares) and the **✕** show at the right end of the row under the pointer
+  and of the picked row. The copy mark puts a copy of the layer right above it, with the same pixels
+  on every frame, and paints on the copy. The ✕ takes that layer out. The last layer has no ✕, it
+  stays.
 - **Merge down** lays the layer onto the one below it, on every frame, and takes it out. Every pixel
   it paints covers the one below. Its opacity is **not** kept: an indexed picture has no colour
   between two palette entries, so the merged layer keeps the opacity of the lower one.
@@ -83,8 +90,9 @@ Every frame has the same layers. The **FRAMES** list shows them in order, first
 a picture of the whole frame; a click picks the frame the canvas shows and paints on.
 
 - **Dragging** a row moves the frame to another place in the order.
-- The **+** in the list's header puts an empty frame after the picked one, **Duplicate** below the
-  list a copy of it. The **✕** on a row takes that frame out. The last frame has no ✕, it stays.
+- The **+** in the list's header puts an empty frame after the picked one. The **copy mark** on a row
+  puts a copy of that frame right after it, the **✕** takes that frame out. Both show on the row
+  under the pointer and on the picked one. The last frame has no ✕, it stays.
 - **Onion skin** (in the **VIEW** block) shows the frames before and after the picked one faintly
   under it.
 - **PREVIEW** plays the frames in a loop. **Frames per second** belongs to the preview only; how long

Tilemaps.md

@@ -104,14 +104,18 @@ last (over the others). The list works like every layer list of the editor (the
 
 - a click on a row chooses the layer to paint on;
 - **dragging** a row moves the layer to another place in the drawing order, one undo step;
-- the **eye** next to the ✕ switches the layer off and on: a layer switched off keeps its cells
-  and is left out of the drawing, in the editor and in the game alike.
+- the **eye** switches the layer off and on: a layer switched off keeps its cells and is left out
+  of the drawing, in the editor and in the game alike;
+- a **double-click** on a layer's name edits it right in the row (#138). Enter or a click elsewhere
+  keeps it, Esc goes back, and a blank name is not taken;
+- the **number** left of the eye is the layer's **Z**, see below. Click it to type, or drag it
+  sideways to scrub;
+- the **copy mark** (two squares) puts a copy of the layer right above it, cells, Z and all, and
+  paints on the copy. It shows, like the ✕, on the row under the pointer and on the chosen one.
 
-Below the list (#138):
+The layer's settings (#138):
 
-- **Name** renames the layer you paint on. A blank name is not taken; the field goes back to the
-  old one.
-- **Z** (#174) is that layer's place among the other objects of the scene, **added to the map's own
+- **Z** (#174), the number in the row, is that layer's place among the other objects of the scene, **added to the map's own
   Z**, just as a child's Z is added to its parent's. Every layer starts at 0, where it is drawn right
   after the map in list order, exactly as before. Give a layer "Treetops" a Z of 10 on a map at 0,
   and a figure at 5 walks between the ground and the treetops. Because it is relative, moving the

Vector-Art.md

@@ -106,7 +106,9 @@ Selecting a shape — in the tab or in the list — gives it its own rows:
   Ctrl or Shift on a row adds its shape to the selection, as Ctrl+click does in the tab.
 - **Forward / To front / Backward / To back** move the selected shape through that order, and a row
   can be **dragged** to another place in the list, also one that was not selected before: it is
-  selected when the mouse button goes up. The **✕** at the right end of a row removes that shape.
+  selected when the mouse button goes up. A **double-click** on a name edits it right in the row.
+  On the row under the pointer and on the selected ones, the **copy mark** (two squares) puts a copy
+  of the shape right above it, on the same spot, and selects the copy; the **✕** removes that shape.
   The same list is used for the layers of a [tilemap](Tilemaps) and the layers and frames of
   [pixel art](Pixel-Art); there its header also has a **+** that adds one. Shapes have none, they
   are drawn with the Pen.