feat(draw): answer the Draw controls through the display store

The draw tool no longer looks up or listens on its controls. It connects
toggleDraw, setDrawShape, setDrawColor, setDrawLabel and clearDraw to the
display store, which now holds several owners and lets the newest owner
of an action answer it, and it publishes the colour and label beside the
shape, state and hint. The Draw panel renders the shape choice with
UiSegmented and binds the label and colour to what the tool publishes.

The label field's own Enter listener goes: the session's capture-phase
key handler already finishes the shape from that field.

docs/VUE-MIGRATION.md

@@ -132,7 +132,9 @@ a feature supplying only its accent.
    the HUD, Sonar, Scope, Celestial, detection, bloom and sharpen from the
    `gev-display` store, which VisualSettings publishes to, and the 3D
    aircraft group, the Draw controls and the imported file list, which
-   AircraftDisplay, the draw tool and the file import publish beside it; the
+   AircraftDisplay, the draw tool and the file import publish beside it;
+   the controls call DisplayBindings and the draw tool through the store's
+   `connect`/`act`, the newest owner of an action answering it; the
    file import restores keyboard focus once the list has rendered; the
    style parameter rows render through Vue behind `createStyleParameters()`,
    as a render function so the portable `./ui/input` entry needs no