feat(mosaic): migrate install wizard from v0 to v1 (#103)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

packages/mosaic/src/errors.ts

@@ -0,0 +1,20 @@
+export class WizardCancelledError extends Error {
+  override name = 'WizardCancelledError';
+  constructor() {
+    super('Wizard cancelled by user');
+  }
+}
+
+export class ValidationError extends Error {
+  override name = 'ValidationError';
+  constructor(message: string) {
+    super(message);
+  }
+}
+
+export class TemplateError extends Error {
+  override name = 'TemplateError';
+  constructor(templatePath: string, message: string) {
+    super(`Template error in ${templatePath}: ${message}`);
+  }
+}