fix(globe): the Navara follow orbits on drag and zooms to the floor

Review of Task 5: while following on Navara a left drag panned the globe
about the ground point under the cursor (range 2,154 m → 54,136 m) and the
wheel zoomed toward that point (462 m after 40 notches, Cesium stops at
the 150 m floor). While a follow runs, Navara's spin, zoom and tilt are
now suspended (input.suspendCameraInputs, which gives the app's own
setCameraInputs choice back after the release) and followGestures.js turns
a drag into heading and pitch of the ENU offset (a canvas width is one
turn, its height half a turn; elevation kept within 2°-89°) and a wheel
notch into 20 % of its range, never inside the minimum range, as Cesium's
EntityView orbits the target. The offset is no longer read back from a
camera the follow alone moves.

Also (review item 7): a follow requests a render only when the target, the
offset or a gesture changed, so a still target lets Navara idle.

The contract follow check drags (range within ±5 %, target within 3 px)
and turns the wheel 40 notches (never below 149 m, ends within 5 % of
150 m) on both engines with real input (qa-globe-contract's pointer gains
drag and wheel); after stop it waits for Cesium's gesture inertia to end
before checking that the camera is free. Contract: Cesium 73/73, Navara
79/79.

scripts/package-boundaries.json

@@ -2564,7 +2564,8 @@
       "src/globe/navara/movers/pack.js",
       "src/globe/navara/movers/modelMover.js",
       "src/globe/navara/movers/index.js",
-      "src/globe/surfaceDetail.js"
+      "src/globe/surfaceDetail.js",
+      "src/globe/navara/followGestures.js"
     ],
     "external": [
       "hls.js",