Preserve preview harness, editor, email and task improvements

Snapshot current maintainer-preview application changes and regression fixtures for integration into lab. Excludes local runtime data, evaluation outputs and source backups. Focused Python regression selection: 140 passed; full suite not certified.

static/js/generatedImageResult.js

@@ -0,0 +1,13 @@
+// Older saved turns kept image fields only inside the tool's JSON output.
+export function generatedImageResult(event) {
+  if (!event || event.error || (event.exit_code != null && event.exit_code !== 0)) return null;
+  if (event.image_url) return event;
+  if (!['generate_image', 'edit_image'].includes(event.tool) || typeof event.output !== 'string') return null;
+  try {
+    const result = JSON.parse(event.output);
+    if (result.error || !result.image_url || typeof result.image_url !== 'string') return null;
+    return result;
+  } catch {
+    return null;
+  }
+}