List drawn shapes under Draw, with icon shapes and colour swatches

Each shape drawn by hand gets a row under Draw, as Import's files do: its
colour swatch, its name, and show/hide, fly-to and remove. A shape is named
in its row, and its swatch opens the five colours there, so labelling and
colouring happen after a shape is drawn and can be seen, instead of in a
field filled in beforehand. Area, Line and Pin become icon buttons, named
for screen readers and tooltips, and the colour for the next shape is a row
of swatches instead of a dropdown.

The annotation engine gains per-mark remove, setHidden, restyle and frame,
and onChange so the list follows the board. A hidden mark stays on the board
at alpha 0, a renamed line keeps its length, and fly-to frames a line by its
whole path. Voice marks are not listed.

The Draw, form-field and segmented-control gates drive the new controls;
swatches are checked as chips, not segments.

README.md

@@ -357,7 +357,7 @@ camera input stops rotation.
 
 > 🗣️ _"Outline the state of Texas."_ · _"Annotate the Texas State Capitol and its grounds"_ — it draws the **actual enclosing boundary**, not a circle. · _"How far is the Eiffel Tower from the Louvre?"_ — a connector arrow appears and it speaks the distance. Everything persists until you say _"clear the map."_
 
-**✍️ Or draw it yourself** — UTILITIES ▸ **Draw**: pick Area, Line or Pin, click the vertices on the real world, double-click to finish, label it. Same whiteboard, same persistence, no microphone needed.
+**✍️ Or draw it yourself** — UTILITIES ▸ **Draw**: pick Area, Line or Pin and a colour, click the vertices on the real world, double-click to finish, then name, recolour, hide or fly to each shape from its row. Same whiteboard, same persistence, no microphone needed.
 
 ![Zilker Park and Lady Bird Lake drawing onto the 3D city as persistent vector annotations, by voice](docs/media/01-voice-annotate-zilker.gif)