feat(ui): portable, resizable rail panels for CCTV

A drag spec can now be `portable`: dragging the panel by its header lifts
it out of the right rail into a fixed window, resizable from all four
edges and corners, that remembers its place and size under the existing
godsEyeView.v8.panelPos.<id> key ({ left, top, width?, height?, floating })
and snaps back on a header double-click. Only CCTV opts in here; the rail
skips .panel-floating panels when measuring and allocating, and its
placement rules in layers.css are guarded so no !important is needed.
PanelPositionControls gains an optional onPanelResized hook, threaded
through PanelChrome to a no-op on the application shell.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

src/rightRailPolicy.test.mjs

@@ -45,7 +45,11 @@ test('desktop Display participates in Tactical exclusivity without changing mobi
     /panel\.id !== 'pp-toggles' && !panel\.classList\.contains\('collapsed'\)/,
   );
   assert.match(ui, /if \(exclusive && panel\.classList\.contains\('collapsed'\)\)\s*panel\.setAttribute\('aria-hidden', 'true'\)/);
-  assert.match(css, /#right-context-rail\.layout-exclusive > \[data-panel-id\]\.collapsed \{/);
+  // A panel floating out of the rail (portable mode) is exempt from exclusivity.
+  assert.match(
+    css,
+    /#right-context-rail\.layout-exclusive\s*> \[data-panel-id\]\.collapsed:not\(\.panel-floating\) \{/,
+  );
 });
 
 test('explicit Contacts, Space Missions, and Cockpit actions expand Global Context after success', () => {