Fix missing spacer between assistant message and text editor

Initialize widgetContainer with default spacer during init() instead of
only when extension widgets change.

fixes #655

packages/coding-agent/CHANGELOG.md

@@ -29,6 +29,7 @@
 
 ### Fixed
 
+- Missing spacer between assistant message and text editor ([#655](https://github.com/badlogic/pi-mono/issues/655))
 - Session picker respects custom keybindings when using `--resume` ([#633](https://github.com/badlogic/pi-mono/pull/633) by [@aos](https://github.com/aos))
 - Custom footer extensions now see model changes: `ctx.model` is now a getter that returns the current model instead of a snapshot from when the context was created ([#634](https://github.com/badlogic/pi-mono/pull/634) by [@ogulcancelik](https://github.com/ogulcancelik))
 - Footer git branch not updating after external branch switches. Git uses atomic writes (temp file + rename), which changes the inode and breaks `fs.watch` on the file. Now watches the directory instead.

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -456,6 +456,7 @@ export class InteractiveMode {
 		this.ui.addChild(this.pendingMessagesContainer);
 		this.ui.addChild(this.statusContainer);
 		this.ui.addChild(this.widgetContainer);
+		this.renderWidgets(); // Initialize with default spacer
 		this.ui.addChild(this.editorContainer);
 		this.ui.addChild(this.footer);
 		this.ui.setFocus(this.editor);