fix(studio): editor — friendly-error mapping for run failures

Previously a failed runSavedFlow dumped the raw exception
into FaiErrorBox in the right panel. Hub gRPC failures
(network, missing module, schema reject, …) are now mapped
through friendlyError so the operator sees a one-sentence
headline + optional recovery hint, with the verbatim error
still accessible behind FaiErrorBox's expand-on-tap.

Matches the same pattern already used by every other Studio
page that surfaces a hub error.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/pages/flow_editor.dart

@@ -639,9 +639,41 @@ class _RunResult extends StatelessWidget {
           ),
           const SizedBox(height: FaiSpace.sm),
           if (running) const LinearProgressIndicator(),
-          if (error != null)
-            FaiErrorBox(error: error, isError: true)
-          else if (outputs != null)
+          if (error != null) ...[
+            // Map raw exceptions through friendlyError so the
+            // operator sees a sentence + a recovery hint
+            // instead of a stack trace. The verbatim error
+            // stays accessible via FaiErrorBox's expand-on-tap.
+            Builder(
+              builder: (ctx) {
+                final fe = friendlyError(error!, l);
+                return Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(
+                      fe.headline,
+                      style: Theme.of(ctx).textTheme.bodyMedium?.copyWith(
+                            color: Theme.of(ctx).colorScheme.error,
+                          ),
+                    ),
+                    if (fe.hint != null) ...[
+                      const SizedBox(height: FaiSpace.xs),
+                      Text(
+                        fe.hint!,
+                        style: Theme.of(ctx).textTheme.bodySmall,
+                      ),
+                    ],
+                    const SizedBox(height: FaiSpace.sm),
+                    FaiErrorBox(
+                      error: fe.detail,
+                      isError: true,
+                      maxHeight: 200,
+                    ),
+                  ],
+                );
+              },
+            ),
+          ] else if (outputs != null)
             Expanded(
               child: ListView(
                 children: [