fix(drone): resolve drone feed fog and flicker issues

- Add preserveDrawingBuffer to enable automated test screenshots
- Neutralize scene fog during drone render pass to prevent misted aerial view
- Render drone feed every frame instead of alternating with ground view
- Update visor styling with scanline effect and improved borders
- Add debug getters for WebGL renderer and scene information

public/js/city/app.js

@@ -30,7 +30,9 @@ scene.fog = new THREE.Fog(0x87ceeb, 120, 600);
 const camera = new THREE.PerspectiveCamera(72, 1, 0.1, 2000);
 camera.position.set(0, 1.7, 0);
 
-const renderer = new THREE.WebGLRenderer({ antialias: true });
+// preserveDrawingBuffer: lets automated tests/screenshots read real
+// frame pixels (the PIP visor proof); cost is negligible here.
+const renderer = new THREE.WebGLRenderer({ antialias: true, preserveDrawingBuffer: true });
 renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
 renderer.shadowMap.enabled = true;
 renderer.shadowMap.type = THREE.PCFSoftShadowMap;
@@ -4347,6 +4349,18 @@ function renderDroneView() {
     drone.cam.aspect = w / h;
     drone.cam.updateProjectionMatrix();
 
+    // Neutralise the city fog for the drone feed so the aerial view is
+    // never misted ("embassado"). Only the fog uniform values change for
+    // this pass — three refreshes them per render, so no material is
+    // recompiled and the ground view keeps its weather haze.
+    const fog = scene.fog;
+    const fogNear = fog ? fog.near : 0;
+    const fogFar = fog ? fog.far : 0;
+    if (fog) {
+        fog.near = 1e7;
+        fog.far = 2e7; // smoothstep → factor 0 at any real distance
+    }
+
     renderer.setScissorTest(true);
     renderer.setScissor(x, y, w, h);
     renderer.setViewport(x, y, w, h);
@@ -4354,6 +4368,12 @@ function renderDroneView() {
     renderer.setScissorTest(false);
     renderer.setViewport(0, 0, cr.width, cr.height);
 
+    if (fog) {
+        fog.near = fogNear;
+        fog.far = fogFar;
+    }
+
+    drone.fogCleared = !!fog;
     drone.view = { x, y, w, h };
 }
 
@@ -7137,10 +7157,10 @@ function animate() {
     renderer.render(scene, camera);
     perfFrame.render = performance.now() - tRender;
 
-    // Drone command-panel feed: scissored second pass on alternate frames.
+    // Drone command-panel feed: scissored pass every frame so the visor
+    // never alternates between the drone view and the ground view.
     if (drone.active && drone.mesh) {
-        drone.frame += 1;
-        if (drone.frame % 2 === 0) renderDroneView();
+        renderDroneView();
     }
 }
 animate();
@@ -7626,6 +7646,26 @@ window.__city10 = {
         return out;
     },
     playerCrossingAllowed,
+    /** Debug: the WebGL renderer (frame forensics for automated tests). */
+    get gl() {
+        return renderer;
+    },
+    /** Debug: live scene background/fog hex + camera pose. */
+    get sceneInfo() {
+        return {
+            bg: scene.background ? scene.background.getHexString() : null,
+            fog: scene.fog ? scene.fog.color.getHexString() : null,
+            fogNear: scene.fog ? scene.fog.near : null,
+            fogFar: scene.fog ? scene.fog.far : null,
+            cam: {
+                x: +camera.position.x.toFixed(2),
+                y: +camera.position.y.toFixed(2),
+                z: +camera.position.z.toFixed(2),
+            },
+            toneMapping: renderer.toneMapping,
+            exposure: renderer.toneMappingExposure,
+        };
+    },
     /** Current bump-to-talk peer (null when the chat is closed). */
     get talkPeer() {
         return currentPeer;
@@ -7684,6 +7724,8 @@ window.__city10 = {
             trafficLights: trafficSystem ? trafficSystem.heads.length / 2 : 0,
             crosswalks: crosswalkCount,
             sidewalkSegments: sidewalkSegmentCount,
+            hour: +(sim.hour ?? 0).toFixed(1),
+            night: +(sim.nightFactor ?? 0).toFixed(2),
             beach: beachSystem ? beachSystem.counts() : null,
             flights: airplaneSystem ? airplaneSystem.flights() : null,
             port: portSystem ? portSystem.counts() : null,
@@ -7693,6 +7735,7 @@ window.__city10 = {
                 y: +drone.pos.y.toFixed(1),
                 z: +drone.pos.z.toFixed(1),
                 yaw: +drone.yaw.toFixed(2),
+                fogCleared: !!drone.fogCleared,
                 view: drone.view || { x: 0, y: 0, w: 0, h: 0 },
             } : null,
             robots: pedestrianSystem