Update shared Gaia workflows and Sargo development tooling

Fix camera switching and Contacts/SMS activity routing across shared hosts.
Integrate Marketplace installation and native standalone recovery tools,
Bluetooth runtime packages and trusted certificates.

Update English/French READMEs and the shared changelog with tested scope
and remaining radio/audio/Bluetooth limitations. Preview17 remains the
existing APK; no new native image is released.

Validation: shared JavaScript and native Python tests; Android packaging
and payload parity from an isolated publication checkout.

tests/settings-transitions.test.mjs

@@ -0,0 +1,29 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import vm from 'node:vm';
+import {readFile} from 'node:fs/promises';
+const source=await readFile(new URL('../gaia/apps/settings/js/modules/page_transitions.js',import.meta.url),'utf8');
+function fixture(duration='0.4s') {
+  let module, timer, delay, calls=0, ready=0;
+  const panel=Object.assign(new EventTarget(),{id:'wifi',className:''});
+  vm.runInNewContext(source,{define:fn=>{module=fn();},CustomEvent,
+    window:{scrollX:0,scrollY:0,dispatchEvent:()=>ready++,getComputedStyle:()=>({transitionDuration:duration,transitionDelay:'0s'})},
+    setTimeout:(cb,ms)=>{timer=cb;delay=ms;return 1;},clearTimeout:()=>{}});
+  module.oneColumn({id:'root',className:'current'},panel,()=>calls++);
+  return {panel,finish:()=>timer(),state:()=>({calls,ready,delay})};
+}
+test('Settings reaches onShow when no transition event arrives',()=>{
+  const f=fixture();assert.equal(f.state().calls,0);f.finish();
+  assert.deepEqual(f.state(),{calls:1,ready:1,delay:500});
+  f.panel.dispatchEvent(new Event('transitionend'));f.finish();
+  assert.equal(f.state().calls,1);
+});
+test('normal and cancelled transitions finish exactly once',()=>{
+  for(const type of ['transitionend','transitioncancel']){
+    const f=fixture();f.panel.dispatchEvent(new Event(type));f.finish();
+    assert.equal(f.state().calls,1);assert.equal(f.state().ready,1);
+  }
+});
+test('disabled animations do not leave navigation pending',()=>{
+  const f=fixture('0s');assert.equal(f.state().delay,100);f.finish();assert.equal(f.state().calls,1);
+});