Release Android Preview 21 and bilingual changelog

Add permission-based reading of Android contacts, SMS and call history. Include shared Gaia fixes and document device validation limits. Pixel image qualification remains pending.

tests/settings-panel-cache.test.mjs

@@ -0,0 +1,29 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import vm from 'node:vm';
+import {readFileSync} from 'node:fs';
+const source=readFileSync(new URL('../gaia/apps/settings/js/modules/panel_cache.js',import.meta.url),'utf8');
+function fixture(load) {
+  let cache;
+  function require(id,ok,fail) {
+    if(Array.isArray(id))return load(ok,fail);
+    if(id==='shared/lazy_loader')return {load:(_,done)=>done()};
+    return ()=>({beforeShow(){}});
+  }
+  vm.runInNewContext(source,{define:factory=>cache=factory(require),navigator:{addIdleObserver(){}},
+    document:{getElementById:()=>({querySelector:()=>({dataset:{path:'panels/storage/panel'}})})}});
+  return cache;
+}
+for(const failure of ['dependency','constructor','invalid']) test('Panel cache reports '+failure+' failure without caching a broken panel',()=>{
+  let broken=true;
+  const expected=new Error('storage unavailable');
+  const cache=fixture((ok,fail)=>{
+    if(!broken)return ok(()=>({beforeShow(){}}));
+    if(failure==='dependency')return fail(expected);
+    ok(()=>{if(failure==='constructor')throw expected;return {};});
+  });
+  let calls=0;
+  cache.get('mediaStorage',(panel,error)=>{calls++;assert.equal(panel,null);assert.ok(error);});
+  assert.equal(calls,1);broken=false;
+  cache.get('mediaStorage',(panel,error)=>{assert.equal(error,undefined);assert.equal(typeof panel.beforeShow,'function');});
+});