fixes #161: disable theme watcher in print mode

The theme file watcher was keeping the Node.js process alive indefinitely
even in print mode where hot-reload is unnecessary. This fix adds an
enableWatcher parameter to initTheme() and setTheme() functions, and only
enables watchers in interactive mode.

- Modified initTheme() to accept enableWatcher parameter (default: false)
- Modified setTheme() to accept enableWatcher parameter (default: false)
- Updated main.ts to only enable watchers in interactive mode
- Updated InteractiveMode to enable watchers when changing themes

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

@@ -1164,7 +1164,7 @@ export class InteractiveMode {
 			const selector = new ThemeSelectorComponent(
 				currentTheme,
 				(themeName) => {
-					const result = setTheme(themeName);
+					const result = setTheme(themeName, true);
 					this.settingsManager.setTheme(themeName);
 					this.ui.invalidate();
 					done();
@@ -1179,7 +1179,7 @@ export class InteractiveMode {
 					this.ui.requestRender();
 				},
 				(themeName) => {
-					const result = setTheme(themeName);
+					const result = setTheme(themeName, true);
 					if (result.success) {
 						this.ui.invalidate();
 						this.ui.requestRender();