feat(panels): render each panel's state classes from the store

A panel's collapsed, dock-pinned, dock-pinned-top, layout-auto-collapsed
and accordion-collapsed classes are drawn by its root's v-panel-state from
the gev-panel-chrome store. PanelChrome, its restore, the layout
controller, both rails and the side accordion present each panel's state
there instead of writing its classes; the rails call onCollapse(panel,
{collapsed, auto}). The directive applies a change in a synchronous
watcher, since the rails measure a panel in the task that opens or closes
it.

Destroying the chrome inside Cockpit now puts back the panels Cockpit's
entry closed while it can still present them. Without a shell, the voice
tools' set_panel_open reports that there is no panel to open. QA scripts
present the states they set instead of writing the classes.

src/cockpitMarkup.test.mjs

@@ -1088,7 +1088,7 @@ test('Cockpit Display portals shared HUD, Detection, Parameters, and 3D controls
   );
   assert.match(
     ui,
-    /_revealCockpitStyleParameters\(\{ openDisplay = false \} = \{\}\) \{[\s\S]*?openDisplay[\s\S]*?_setCockpitDisclosure\?\.\('display', true\)[\s\S]*?!this\._cockpitDisclosureOpen\?\.\('display'\)[\s\S]*?classList\.remove\('collapsed'\)/,
+    /_revealCockpitStyleParameters\(\{ openDisplay = false \} = \{\}\) \{[\s\S]*?openDisplay[\s\S]*?_setCockpitDisclosure\?\.\('display', true\)[\s\S]*?!this\._cockpitDisclosureOpen\?\.\('display'\)[\s\S]*?_presentPanel\(this\._sliderPanel, \{ collapsed: false \}\)/,
   );
   assert.match(
     radioBindings,