refactor(ui): remove floating, resizable rail panels

PR #768 bundled a portable-panel windowing system with the Street Level
layer. Remove it so CCTV and Street Level are ordinary docked right-rail
panels again, as on main before the merge.

Removed:
- header drag to float, 8-way edge/corner resize, double-press snap-back,
  dockOnCollapse, command-dock clearance, float hint toast, floating z floor,
  persisted floating geometry and ResizeObserver re-clamping
  (panelPositionControls.js restored to its pre-#768 version)
- src/ui/panelResize.js and its tests, panelDock.test.mjs
- onPanelResized/dockPanel wiring in PanelChrome, the application shell and
  StreetLevelControls (EXPAND/SHRINK no longer docks)
- :not(.panel-floating) guards and .panel-floating/.panel-portable/resize CSS
- qa:panel-resize, qa-panel-resize.mjs, qa-panelDrag.mjs, their tests, the
  CI "Portable panel gate" step, QA_FAIL_ON_RETRY, and the Street Level
  gate's float/resize/dock steps
- floating-panel docs in README, CHANGELOG, CURRENT-STATE, KNOWN-ISSUES

Kept: the Street Level panel as a docked rail panel (share/cockpit/rail
lists, layout controller, rail and Cyber CSS, EXPAND viewer), and the
independent right-rail alignment fix (settledLeftRailTop, 9dde7b4).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

scripts/format-scope.json

@@ -36,9 +36,6 @@
   "src/main.js",
   "docs/APPLICATION.md",
   "scripts/qa-application.mjs",
-  "scripts/qa-panel-resize.mjs",
-  "scripts/qa-panelDrag.mjs",
-  "src/tooling/panelResizeQa.test.mjs",
   "scripts/qa-terrain-429.mjs",
   "src/app/application.js",
   "src/app/application.test.mjs",
@@ -168,7 +165,6 @@
   "src/ui/panelRails.js",
   "src/ui/leftPanelRail.js",
   "src/ui/rightPanelRail.js",
-  "src/ui/panelResize.test.mjs",
   "src/ui/panelMeasurement.js",
   "src/ui/panelRailGeometry.js",
   "src/ui/panelRails.test.mjs",
@@ -917,7 +913,6 @@
   "src/layers/streetLevel/providers/mapillary/coverageFixture.mjs",
   "src/layers/streetLevel/cameraFollow.test.mjs",
   "src/ui/streetLevelControls.test.mjs",
-  "src/ui/panelDock.test.mjs",
   "src/layers/streetLevel/marker.test.mjs",
   "src/layers/streetLevel/viewerHost.test.mjs",
   "src/layers/streetLevel/providers/mapillary/sequences.test.mjs",