fix: cancel Nepal media preloads and respect drawing ownership

Retain active-flight preloading while canceling hidden frames and pending Facebook sessions on stop, disable, and replacement. Add lifecycle and pointer-ownership regression coverage. Apply the runtime formatting adopted on main and keep the existing source-shape check insensitive to that formatting.

src/scenes/nepalEvidencePack.js

@@ -13,7 +13,7 @@ const ADDITIONAL_SHOTS = [
     alt: 10145,
     heading: 224,
     pitch: -38,
-    hold: 11
+    hold: 11,
   },
   {
     id: 'dhunche',
@@ -23,7 +23,7 @@ const ADDITIONAL_SHOTS = [
     alt: 6212,
     heading: 208,
     pitch: -39,
-    hold: 16
+    hold: 16,
   },
   {
     id: 'mailung-upper-trishuli',
@@ -33,7 +33,7 @@ const ADDITIONAL_SHOTS = [
     alt: 6353,
     heading: 211,
     pitch: -40,
-    hold: 13
+    hold: 13,
   },
   {
     id: 'mailung-bazzar',
@@ -43,7 +43,7 @@ const ADDITIONAL_SHOTS = [
     alt: 6331,
     heading: 212,
     pitch: -40,
-    hold: 15
+    hold: 15,
   },
   {
     id: 'dandagaun',
@@ -53,7 +53,7 @@ const ADDITIONAL_SHOTS = [
     alt: 6311,
     heading: 214,
     pitch: -40,
-    hold: 15
+    hold: 15,
   },
   {
     id: 'dandagaun-viewpoint',
@@ -63,7 +63,7 @@ const ADDITIONAL_SHOTS = [
     alt: 6740,
     heading: 215,
     pitch: -41,
-    hold: 13
+    hold: 13,
   },
   {
     id: 'betrawati-bazaar',
@@ -73,7 +73,7 @@ const ADDITIONAL_SHOTS = [
     alt: 7034,
     heading: 216,
     pitch: -41,
-    hold: 12
+    hold: 12,
   },
   {
     id: 'bhainse',
@@ -83,7 +83,7 @@ const ADDITIONAL_SHOTS = [
     alt: 8051,
     heading: 219,
     pitch: -41,
-    hold: 13
+    hold: 13,
   },
   {
     id: 'devighat-taadi-khola-bridge',
@@ -93,7 +93,7 @@ const ADDITIONAL_SHOTS = [
     alt: 9056,
     heading: 224,
     pitch: -42,
-    hold: 13
+    hold: 13,
   },
   {
     id: 'charaudi',
@@ -103,7 +103,7 @@ const ADDITIONAL_SHOTS = [
     alt: 10347,
     heading: 232,
     pitch: -42,
-    hold: 11
+    hold: 11,
   },
   {
     id: 'final-view',
@@ -116,8 +116,8 @@ const ADDITIONAL_SHOTS = [
     roll: 174,
     duration: 4,
     hold: 11,
-    locatorPresentation: 'bhote-koshi-incident-places'
-  }
+    locatorPresentation: 'bhote-koshi-incident-places',
+  },
 ];
 const EVIDENCE_ORDER = [
   'immediate-collapse-viewpoint',
@@ -136,7 +136,7 @@ const EVIDENCE_ORDER = [
   'bidur-trishuli-bridge',
   'devighat-taadi-khola-bridge',
   'charaudi',
-  'final-view'
+  'final-view',
 ];
 
 // Per-reach motion timing keeps the schematic front ahead of the fixed 4.2s
@@ -147,60 +147,66 @@ const PATH_DURATION_BY_BEAT = Object.freeze({
   'second-landslide': 6.5,
   'timure-cluster': 2.1,
   'syabru-besi': 2.8,
-  'dhunche': 2.5,
+  dhunche: 2.5,
   'mailung-upper-trishuli': 2.9,
   'mailung-bazzar': 2.1,
-  'dandagaun': 1.2,
+  dandagaun: 1.2,
   'dandagaun-viewpoint': 2.5,
   'betrawati-bazaar': 2.9,
-  'bhainse': 1.5,
+  bhainse: 1.5,
   'bidur-trishuli-bridge': 2.6,
 });
 
 /** Extend the six-beat Nepal pack without replacing existing authored shots. */
 export function expandNepalEvidencePack(base) {
   const layerId = base.requiredSourcePackLayerId;
-  const extraShots = ADDITIONAL_SHOTS.map(({
-    id,
-    hold,
-    duration = 4.2,
-    locatorPresentation,
-    ...camera
-  }) => ({
-    ...camera,
-    roll: Number.isFinite(Number(camera.roll)) ? Number(camera.roll) : 0,
-    duration,
-    hold,
-    mapStack: 'photoreal',
-    layers: {
-      [layerId]: { enabled: true, params: {
-        presentation: 'scene-beat',
-        beatId: id,
-        beatReveal: 0.36,
-        split: 0.5,
-      } },
-      ...(locatorPresentation ? {
-        'bhote-koshi-locator': {
+  const extraShots = ADDITIONAL_SHOTS.map(
+    ({ id, hold, duration = 4.2, locatorPresentation, ...camera }) => ({
+      ...camera,
+      roll: Number.isFinite(Number(camera.roll)) ? Number(camera.roll) : 0,
+      duration,
+      hold,
+      mapStack: 'photoreal',
+      layers: {
+        [layerId]: {
           enabled: true,
-          params: { presentation: locatorPresentation },
+          params: {
+            presentation: 'scene-beat',
+            beatId: id,
+            beatReveal: 0.36,
+            split: 0.5,
+          },
         },
-      } : {}),
-    },
-  }));
-  const byBeat = new Map([...base.cameraPath, ...extraShots].map((shot) => [
-    shot.layers[layerId].params.beatId, shot,
-  ]));
+        ...(locatorPresentation
+          ? {
+              'bhote-koshi-locator': {
+                enabled: true,
+                params: { presentation: locatorPresentation },
+              },
+            }
+          : {}),
+      },
+    }),
+  );
+  const byBeat = new Map(
+    [...base.cameraPath, ...extraShots].map((shot) => [
+      shot.layers[layerId].params.beatId,
+      shot,
+    ]),
+  );
   const cameraPath = EVIDENCE_ORDER.map((id) => byBeat.get(id));
   const runtimeControlsByBeat = { ...base.runtimeControlsByBeat };
   const cameraLedPathBeats = new Set([
-    'timure-cluster', 'syabru-besi', ...SOURCE_PATH_BEAT_IDS.slice(2),
-  ]);
-  const mediaLedPathBeats = new Set([
-    'debris-dammed-lake', 'second-landslide',
+    'timure-cluster',
+    'syabru-besi',
+    ...SOURCE_PATH_BEAT_IDS.slice(2),
   ]);
+  const mediaLedPathBeats = new Set(['debris-dammed-lake', 'second-landslide']);
   const finalSourcedPathBeatId = SOURCE_PATH_BEAT_IDS.at(-1);
   const postSourceHistoryBeats = new Set([
-    'devighat-taadi-khola-bridge', 'charaudi', 'final-view',
+    'devighat-taadi-khola-bridge',
+    'charaudi',
+    'final-view',
   ]);
   for (const shot of cameraPath) {
     const id = shot.layers[layerId].params.beatId;
@@ -209,33 +215,43 @@ export function expandNepalEvidencePack(base) {
     runtimeControlsByBeat[id] = {
       ...runtimeControlsByBeat[id],
       evidenceMediaAutoplay: !isFinalView,
-      ...(isFinalView ? {} : {
-        mediaPlaybackHoldSec: id === 'mailung-bazzar' ? 7 : 6,
-        mediaExitDurationSec: 0.65,
-      }),
+      ...(isFinalView
+        ? {}
+        : {
+            mediaPlaybackHoldSec: id === 'mailung-bazzar' ? 7 : 6,
+            mediaExitDurationSec: 0.65,
+          }),
       deferEvidenceUntilCameraSettled: !isFinalView,
       evidenceRevealDurationSec: 0.9,
-      evidencePath: SOURCE_PATH_BEAT_IDS.includes(id) ? 'source'
-        : ['gyirong-border-gate', 'timure-cluster', 'syabru-besi'].includes(id) ? 'comparison' : 'none',
-      ...(cameraLedPathBeats.has(id) ? {
-        evidencePathDuringCamera: true,
-        evidencePathPersistent: true,
-        ...(authoredPathDurationSec
-          ? { evidencePathTravelDurationSec: authoredPathDurationSec }
-          : {}),
-      } : {}),
-      ...(mediaLedPathBeats.has(id) ? {
-        evidencePathDuringMedia: true,
-        evidencePathPersistent: true,
-        evidencePathStartDelaySec: 0,
-      } : {}),
+      evidencePath: SOURCE_PATH_BEAT_IDS.includes(id)
+        ? 'source'
+        : ['gyirong-border-gate', 'timure-cluster', 'syabru-besi'].includes(id)
+          ? 'comparison'
+          : 'none',
+      ...(cameraLedPathBeats.has(id)
+        ? {
+            evidencePathDuringCamera: true,
+            evidencePathPersistent: true,
+            ...(authoredPathDurationSec
+              ? { evidencePathTravelDurationSec: authoredPathDurationSec }
+              : {}),
+          }
+        : {}),
+      ...(mediaLedPathBeats.has(id)
+        ? {
+            evidencePathDuringMedia: true,
+            evidencePathPersistent: true,
+            evidencePathStartDelaySec: 0,
+          }
+        : {}),
     };
     if (SOURCE_PATH_BEAT_IDS.includes(id)) {
       runtimeControlsByBeat[id] = {
         ...runtimeControlsByBeat[id],
         evidenceHoldCard: true,
         evidencePathHistory: true,
-        evidencePathDurationSec: authoredPathDurationSec || Math.max(4, shot.hold),
+        evidencePathDurationSec:
+          authoredPathDurationSec || Math.max(4, shot.hold),
         minimumHoldSec: Math.max(4, shot.hold),
       };
     }
@@ -256,33 +272,40 @@ export function expandNepalEvidencePack(base) {
         evidencePathElevation: 'source',
       };
     }
-    const pathDurationSec = Number(runtimeControlsByBeat[id].evidencePathDurationSec)
-      || (!cameraLedPathBeats.has(id) && runtimeControlsByBeat[id].evidenceSequence === true
+    const pathDurationSec =
+      Number(runtimeControlsByBeat[id].evidencePathDurationSec) ||
+      (!cameraLedPathBeats.has(id) &&
+      runtimeControlsByBeat[id].evidenceSequence === true
         ? Number(runtimeControlsByBeat[id].evidenceSequenceDurationSec) || 0
         : 0);
     const mediaPresentationSec = isFinalView
       ? 0
       : (id === 'mailung-bazzar' ? 7 : 6) + 0.65;
-    const mediaAndPathHoldSec = pathDurationSec > 0
-        && !cameraLedPathBeats.has(id)
-      ? mediaLedPathBeats.has(id)
-        ? Math.max(mediaPresentationSec, pathDurationSec)
-        : mediaPresentationSec + pathDurationSec
-      : mediaPresentationSec;
+    const mediaAndPathHoldSec =
+      pathDurationSec > 0 && !cameraLedPathBeats.has(id)
+        ? mediaLedPathBeats.has(id)
+          ? Math.max(mediaPresentationSec, pathDurationSec)
+          : mediaPresentationSec + pathDurationSec
+        : mediaPresentationSec;
     runtimeControlsByBeat[id] = {
       ...runtimeControlsByBeat[id],
-      minimumHoldSec: id === 'mailung-bazzar' ? mediaAndPathHoldSec : Math.max(
-        Number(runtimeControlsByBeat[id].minimumHoldSec) || 0,
-        mediaAndPathHoldSec,
-      ),
+      minimumHoldSec:
+        id === 'mailung-bazzar'
+          ? mediaAndPathHoldSec
+          : Math.max(
+              Number(runtimeControlsByBeat[id].minimumHoldSec) || 0,
+              mediaAndPathHoldSec,
+            ),
     };
   }
   // Keep the downstream sequence on its sourced river profile. Coarse Google
   // mesh samples can contain cliff-height spikes that reverse apparent motion.
   // Preserve each authored readable hold after the media-first timing floor.
   for (const [id, seconds, sequenceSeconds = seconds] of [
-    ['immediate-collapse-viewpoint', 10], ['gyirong-border-gate', 8, 2.5],
-    ['timure-cluster', 12], ['syabru-besi', 11],
+    ['immediate-collapse-viewpoint', 10],
+    ['gyirong-border-gate', 8, 2.5],
+    ['timure-cluster', 12],
+    ['syabru-besi', 11],
   ]) {
     runtimeControlsByBeat[id] = {
       ...runtimeControlsByBeat[id],
@@ -296,7 +319,10 @@ export function expandNepalEvidencePack(base) {
   }
   const finalView = byBeat.get('final-view');
   return Object.freeze({
-    ...base, version: 18, cameraPath, runtimeControlsByBeat,
+    ...base,
+    version: 18,
+    cameraPath,
+    runtimeControlsByBeat,
     // Clip trims must also replace older saved holds, not just lower a floor.
     runtimeHoldSecByBeat: { 'mailung-bazzar': 7 + 0.65 },
     expansionFromVersion: 17,