fix(cctv): surface heading confidence — estimated bearings are now visible

Every pack sets headingConfidence on each camera, but nothing consumed it:
a bearing synthesized by fallbackHeadingFromId (a hash of the id string,
no geographic input) rendered exactly like a surveyed one — 2,827 of 3,997
cameras in a default catalog. Fixes #639.

Two consumers, plus a passthrough:

- HUD: the heading token is tagged when the bearing is synthetic —
  `HDG 194° (ESTIMATED)` — so a hash never reads as a measured facing.
- Wireframe: a low-confidence camera draws its coverage frustum with dashed
  polylines instead of solid ones. Colors, widths, and the active/idle
  emphasis are unchanged; the dash is the only signal.
- Public camera state gains `headingConfidence` (the raw pack flag) and
  `headingEstimated` (the derived bit) so UI consumers never re-derive it.

A human-vouched pose always wins over the pack flag: a manually saved
calibration (calSource:'manual') or a curated catalog entry
(poseSource:'curated') is never presented as estimated, mirroring the CAL
badge states in calibration.js.

- src/layers/cctv/headingConfidence.js: pure helpers (isHeadingEstimated,
  headingHudToken)
- src/layers/cctv/headingConfidence.test.mjs: confidence normalization,
  calibration/curation overrides, HUD token formatting
- src/layers/cctv/presentation.js: HUD token + public-state passthrough
- src/layers/cctv/rendering.js: dashed materials for estimated bearings

src/layers/cctv/rendering.js

@@ -1,5 +1,6 @@
 import * as Cesium from 'cesium';
 import { horizonOccluder } from '../../data/iconOrientation.js';
+import { isHeadingEstimated } from './headingConfidence.js';
 import {
   ACTIVE_CAMERA_COLOR,
   IDLE_CAMERA_COLOR,
@@ -228,6 +229,15 @@ export function createRendering({
       );
 
       const inVisibleSet = coverageVisible.has(record.camera.id);
+      // A synthetic bearing (headingConfidence 'low', no human calibration)
+      // draws its wireframe dashed so a guessed facing is visibly provisional
+      // rather than rendering identically to a surveyed one (#639). Colors,
+      // widths, and the active/idle emphasis are unchanged.
+      const bearingEstimated = isHeadingEstimated(record.camera);
+      const lineMaterial = (color) =>
+        bearingEstimated
+          ? new Cesium.PolylineDashMaterialProperty({ color })
+          : color;
       for (const entity of record.coverageEntities || []) {
         // The frustum wireframe is part of the projection representation —
         // force it on for the active camera and let it read through geometry
@@ -242,13 +252,15 @@ export function createRendering({
         // active camera keeps its width/alpha emphasis in both schemes.
         const hue = viewshedOn ? record.viewshedColors : null;
         if (entity._coverageRole === 'cap') {
-          entity.polyline.material = hue
-            ? isActive
-              ? hue.lineActive
-              : hue.line
-            : isActive
-              ? ACTIVE_COVERAGE_CENTER
-              : IDLE_COVERAGE_CENTER_MUTED;
+          entity.polyline.material = lineMaterial(
+            hue
+              ? isActive
+                ? hue.lineActive
+                : hue.line
+              : isActive
+                ? ACTIVE_COVERAGE_CENTER
+                : IDLE_COVERAGE_CENTER_MUTED,
+          );
           entity.polyline.width = isActive ? 2.2 : 1.0;
           entity.polyline.depthFailMaterial = planeShowing
             ? hue
@@ -256,13 +268,15 @@ export function createRendering({
               : ACTIVE_COVERAGE_CENTER_DEPTHFAIL
             : undefined;
         } else {
-          entity.polyline.material = hue
-            ? isActive
-              ? hue.lineActive
-              : hue.line.withAlpha(0.6)
-            : isActive
-              ? ACTIVE_COVERAGE_EDGE
-              : IDLE_COVERAGE_EDGE_MUTED;
+          entity.polyline.material = lineMaterial(
+            hue
+              ? isActive
+                ? hue.lineActive
+                : hue.line.withAlpha(0.6)
+              : isActive
+                ? ACTIVE_COVERAGE_EDGE
+                : IDLE_COVERAGE_EDGE_MUTED,
+          );
           entity.polyline.width = isActive ? 1.8 : 0.9;
           entity.polyline.depthFailMaterial = planeShowing
             ? hue