Release Preview 20 shared desktop, Android and Sargo updates

Restore Gaia settings and media workflows, extend native network adapters, and align the APK payload. Generate French/English changelogs and website entries from the simplified JSON source.

Validation: shared JS and Tundra unit tests; desktop workflows and persistence; signed APK payload parity; Sargo RAM and installed startup with boot readback. Android runtime qualification is recorded separately.

host/StorageStats.sys.mjs

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: MPL-2.0
+// Only byte counts for Vulpes-owned storage cross the application boundary.
+let pending, cached;
+export async function storageStats(app) {
+  if(app.id!=='settings')throw Error('PERMISSION_DENIED');
+  if(cached && Date.now()-cached.at<5000)return cached.value;
+  if(pending)return pending;
+  pending=(async()=>{
+    async function bytes(path,skip='') {
+      if(path===skip || !await IOUtils.exists(path))return 0;
+      const file=Cc['@mozilla.org/file/local;1'].createInstance(Ci.nsIFile);file.initWithPath(path);
+      if(file.isSymlink())return 0;
+      const info=await IOUtils.stat(path);
+      if(info.type==='regular')return info.size;
+      if(info.type!=='directory')return 0;
+      let total=0;
+      for(const child of await IOUtils.getChildren(path)) {
+        try {total+=await bytes(child,skip);} catch(error) {if(error.name!=='NotFoundError')throw error;}
+      }
+      return total;
+    }
+    const profile=PathUtils.profileDir,media=PathUtils.join(profile,'vulpes-media');
+    const file=Cc['@mozilla.org/file/local;1'].createInstance(Ci.nsIFile);file.initWithPath(profile);
+    const value={free:file.diskSpaceAvailable,apps:await bytes(profile,media),sdcard:await bytes(media),scope:'vulpes-profile'};
+    cached={at:Date.now(),value};return value;
+  })().finally(()=>{pending=null;});
+  return pending;
+}