fix(qa): repoint stale mutation anchors after the September refactors

The three mutation gates matched source text that has since moved or been
reflowed, so 37 of their 108 reverts reported STALE and could no longer
prove anything:

- qa-floorhold-mutations (2): the neighbour-floor code moved from
  src/data/groundFloor.js into src/services/groundFloor.js (ac977bd).
- qa-flyroute-mutations (8): src/cameraVerbs.js was reflowed by the
  formatter (2aca7ae); the anchors now match the formatted lines.
- qa-firstrun-mutations (27): the launcher markup, styles and startup moved
  to src/ui/templates/welcome.html, src/ui/styles/first-run.css and
  src/app/startupChrome.js; the rail default to panelPositionControls.js and
  the radio ESC handling to radioBindings.js (a67bc60 and follow-ups). The
  tool-schema pin now edits a tool description, since the context-mode enum
  it used to edit no longer lives in tools.js.

Every revert still reintroduces the same defect. Results: floor-hold 22/22,
fly_route 19/19, first-run 67/67 caught, with all source files restored.

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

scripts/qa-floorhold-mutations.mjs

@@ -26,7 +26,7 @@ const TESTS = [
 ];
 
 const FLIGHTS = 'src/layers/flights/motion.js';
-const FLOOR = 'src/data/groundFloor.js';
+const FLOOR = 'src/services/groundFloor.js';
 const ALT = 'src/data/renderAltitude.js';
 
 /** @type {Array<{defect: string, edits: Array<{file: string, from: string, to: string}>}>} */
@@ -133,8 +133,8 @@ const MUTATIONS = [
     edits: [
       {
         file: FLOOR,
-        from: '      if (lowest == null || h < lowest) lowest = h;',
-        to: '      if (lowest == null || h > lowest) lowest = h;',
+        from: '        if (lowest == null || h < lowest) lowest = h;',
+        to: '        if (lowest == null || h > lowest) lowest = h;',
       },
     ],
   },
@@ -143,8 +143,8 @@ const MUTATIONS = [
     edits: [
       {
         file: FLOOR,
-        from: '  return resolved >= NEIGHBOR_FLOOR_MIN_SAMPLES ? lowest : null;',
-        to: '  return resolved >= 1 ? lowest : null;',
+        from: '    return resolved >= NEIGHBOR_FLOOR_MIN_SAMPLES ? lowest : null;',
+        to: '    return resolved >= 1 ? lowest : null;',
       },
     ],
   },