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.

index.html

@@ -26,7 +26,7 @@
        with the sources: src/materialSymbolsSubset.test.mjs fails when a source
        names a glyph this list is missing, because a missing glyph does not draw
        a box — the ligature never forms and the element renders the literal word. -->
-  <link href="https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20,400,0,0&icon_names=adjust,arrow_drop_down,arrow_forward,arrow_left,arrow_right,bolt,chevron_left,chevron_right,close,close_fullscreen,dark_mode,draw,east,flare,flight,layers,layers_clear,light_mode,local_fire_department,more_horiz,my_location,navigation,normal,on,open_in_full,public,radar,radio,right_panel_close,right_panel_open,rocket_launch,search,settings,skip_next,skip_previous,upload_file,videocam,view_in_ar,visibility,visibility_off" rel="stylesheet" />
+  <link href="https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20,400,0,0&icon_names=adjust,arrow_drop_down,arrow_forward,arrow_left,arrow_right,bolt,chevron_left,chevron_right,close,close_fullscreen,dark_mode,draw,east,flare,flight,layers,layers_clear,light_mode,local_fire_department,location_on,more_horiz,my_location,navigation,normal,on,open_in_full,pentagon,public,radar,radio,right_panel_close,right_panel_open,rocket_launch,search,settings,skip_next,skip_previous,timeline,upload_file,videocam,view_in_ar,visibility,visibility_off" rel="stylesheet" />
 </head>
 <body>
   <!-- gev:template scene-chrome -->