0.10.1: Archify Sync in the status bar, server address as a setting

In workspaces with Archify files, Archify Sync sits in the status bar and
opens a menu: sign in, share, join, server address, settings. The new
archify.sync.server setting (empty by default) is used without asking,
and in workspace settings gives a project one server.
archify.sync.statusBar hides the entry.

src/sync/loader.ts

@@ -16,6 +16,7 @@ const COMMANDS = [
   'archify.sync.versions',
   'archify.sync.stop',
   'archify.sync.menu',
+  'archify.sync.setServer',
 ] as const;
 
 /**
@@ -26,8 +27,26 @@ const COMMANDS = [
  */
 export function registerSync(context: vscode.ExtensionContext, models: ModelService): vscode.Disposable[] {
   let feature: Promise<SyncFeature> | undefined;
+  // Until the sync bundle loads, this entry is the way in; then the bundle's own one takes over.
+  const entry = vscode.window.createStatusBarItem('archify.sync', vscode.StatusBarAlignment.Left, 50);
+  entry.name = 'Archify Sync';
+  entry.text = '$(cloud) Archify Sync';
+  entry.tooltip = 'Archify Sync (optional): sign in, share a model with others or join one. Set the server under Settings › Archify › Sync.';
+  entry.command = 'archify.sync.menu';
+  // Only where there are Archify files: the extension also starts for JSON and HTML.
+  let archifyHere = false;
+  const showEntry = () => {
+    const wanted = archifyHere && !feature && vscode.workspace.getConfiguration('archify.sync').get<boolean>('statusBar', true);
+    if (wanted) entry.show();
+    else entry.hide();
+  };
+  void Promise.resolve(vscode.workspace.findFiles('**/*.{archify,archify-registry,archify-decision}', '{**/node_modules/**,**/.git/**}', 1)).then((found) => {
+    archifyHere = found.length > 0;
+    showEntry();
+  });
   const load = (): Promise<SyncFeature> =>
     (feature ??= (async () => {
+      showEntry();
       // A runtime path, so esbuild leaves the sync bundle out of this one.
       const bundle = path.join(__dirname, 'sync.js');
       const mod = require(bundle) as typeof import('./index');
@@ -44,6 +63,8 @@ export function registerSync(context: vscode.ExtensionContext, models: ModelServ
   })();
 
   return [
+    entry,
+    vscode.workspace.onDidChangeConfiguration((e) => e.affectsConfiguration('archify.sync.statusBar') && showEntry()),
     liveBridge,
     ...COMMANDS.map((id) =>
       vscode.commands.registerCommand(id, async (...args: unknown[]) => (await load()).run(id, ...args)),