Report unavailable lazy chunks without rejecting UI actions

frontend/app-seams.test.js

@@ -76,3 +76,10 @@ test('listening tracking does not pull in the lazy Stats view',()=>{
  assert.deepEqual(groups['feature:stats'].files,['/stats-core.js']);
  assert.match(app,/Lazy\.proxy\('feature:stats-view', \['render'\], 'StatsView'\)/);
 });
+
+test('an unavailable Stats chunk reports an error without rejecting the UI navigation',async()=>{
+ const source=app.match(/function renderStats\(\) \{[\s\S]*?\n\}/)?.[0];assert.ok(source);
+ const seen=[],context=require('node:vm').createContext({Lazy:{proxy:()=>({render:()=>Promise.reject(new Error('Unavailable fixture chunk'))})},toast:text=>seen.push(text)});
+ require('node:vm').runInContext(source+';globalThis.render=renderStats;',context);
+ await context.render();assert.deepEqual(seen,['Unavailable fixture chunk']);
+});

frontend/app.js

@@ -5181,7 +5181,7 @@ const StatsTrack = (() => {
 // Stats view
 // ============================================================================
 function renderStats() {
-  return Lazy.proxy('feature:stats-view', ['render'], 'StatsView').render();
+  return Lazy.proxy('feature:stats-view', ['render'], 'StatsView').render().catch(error => toast(error.message));
 }
 
 
@@ -7798,8 +7798,8 @@ document.querySelectorAll('.chip').forEach((c) => {
   $('sleepCurtain').addEventListener('click', () => $('sleepCurtain').classList.add('hidden'));
   $('sleepCancelBtn').addEventListener('click', () => { cancelSleepTimer(); toast('Sleep timer cancelled'); });
   $('transitionBtn').addEventListener('click', () => Transition.cycle());
-  $('shareMomentBtn').addEventListener('click', () => Share.open());
-  $('externalBtn').addEventListener('click', () => External.open());
+  $('shareMomentBtn').addEventListener('click', () => Share.open().catch(error => toast(error.message)));
+  $('externalBtn').addEventListener('click', () => External.open().catch(error => toast(error.message)));
   $('pipBtn').addEventListener('click', () => PiP.toggle());
   $('eqBtn').addEventListener('click', () => EQ.open());
 
@@ -9005,7 +9005,7 @@ async function boot() {
   syncOnLaunch();
   startPlaylistInboxWatch();
   if(LowerThird.active()) await Lazy.load('feature:lower-third');
-  await Presenter.boot();
+  await Presenter.boot().catch(error => toast(error.message));
   if (LowerThird.active()) return;
   SectionRail.boot();
   if (isMediaId(new URLSearchParams(location.search).get('v'))) Share.bootFromUrl().catch(error => toast(error.message));

perf/seams.mjs

@@ -63,6 +63,10 @@ async function run(name){
   if(groups.includes('feature:stats-view')) {
     await page.evaluate(async()=>{view={type:'stats'};render();});await page.waitForSelector('.stats-empty');checked.push('stats');
   }
+  if(groups.includes('feature:share-external')) {
+    await page.evaluate(()=>{Share.open=()=>Promise.reject(new Error('Unavailable fixture chunk'));document.querySelector('#shareMomentBtn').click();});
+    await page.getByText('Unavailable fixture chunk',{exact:true}).waitFor();
+  }
   assert.equal(proxy.getStats().requestCount,before,'all warmed seam code loads from SW without network');
   // Ignore only verified disconnected version/recommendation API transports in WebKit.
   const scriptErrors=errors.filter(e=>!(name==='webkit'&&(e==='TypeError: Load failed'||/\/api\/(?:recommendations\?[^\s]*|version)\.$/.test(e))));assert.deepEqual(scriptErrors,[]);