fix: thread builder offline runtime race + getDoc method name

Two bugs:
- subscribeOffline() bailed if runtime wasn't initialized yet (race with
  shell.ts init). Now waits for runtime to appear, then awaits init().
- getDoc() called runtime.getDoc() which doesn't exist — method is
  runtime.get(). Caused "e.getDoc is not a function" crash in listThreads.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

modules/rsocials/components/folk-thread-builder.ts

@@ -90,8 +90,22 @@ export class FolkThreadBuilder extends HTMLElement {
 	}
 
 	private async subscribeOffline() {
-		const runtime = (window as any).__rspaceOfflineRuntime;
-		if (!runtime?.isInitialized) return;
+		// Wait for the runtime to be available and initialized
+		let runtime = (window as any).__rspaceOfflineRuntime;
+
+		// The runtime may not be created yet if shell.ts hasn't run init()
+		if (!runtime) {
+			// Wait briefly for shell.ts to create it
+			await new Promise(r => setTimeout(r, 200));
+			runtime = (window as any).__rspaceOfflineRuntime;
+		}
+		if (!runtime) return;
+
+		// Wait for init() to complete if still in progress
+		if (!runtime.isInitialized && runtime.init) {
+			try { await runtime.init(); } catch { /* init may have been called already */ }
+		}
+		if (!runtime.isInitialized) return;
 
 		try {
 			const docId = socialsDocId(this._space) as DocumentId;
@@ -108,8 +122,8 @@ export class FolkThreadBuilder extends HTMLElement {
 					this._thread = updated.threads[this._threadId];
 				}
 			});
-		} catch {
-			// Working without offline runtime
+		} catch (e: any) {
+			console.warn('[thread-builder] Offline subscribe failed:', e.message);
 		}
 	}
 
@@ -160,7 +174,7 @@ export class FolkThreadBuilder extends HTMLElement {
 		const runtime = this.getRuntime();
 		if (!runtime?.isInitialized) return undefined;
 		const docId = socialsDocId(this._space) as DocumentId;
-		return runtime.getDoc(docId);
+		return runtime.get(docId);
 	}
 
 	private listThreads(): ThreadData[] {