feat(studio): wire flow editor quick-fix install handler

FlowsPage now passes onInstallCapability to the editor — the
editor's 'Install <cap>' button on an unknown-capability
diagnostic calls HubService.installModule, refreshes the
capability list, and returns it so the editor reanalyzes and
clears the issue.

On install failure: friendly SnackBar surfaces the error. The
operator never gets stuck on the analyzer reporting a
capability they just clicked to install.

Studio bumped to 0.64.0; editor path-override pulls in 0.17.0.

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

lib/pages/flows.dart

@@ -57,6 +57,44 @@ class _FlowsPageState extends State<FlowsPage> {
     }
   }
 
+  /// Quick-fix handler — invoked when the operator clicks
+  /// `Install <capability>` on an analyzer issue. Parses the
+  /// editor-supplied `provider/name@version` spec into the
+  /// Hub's install API and returns the refreshed capability
+  /// list so the editor can re-analyze without waiting for the
+  /// parent widget rebuild.
+  Future<List<String>?> _onInstallCapability(String capability) async {
+    try {
+      // Editor passes the raw `use:` value (e.g.
+      // `text.classify@^1`). HubService.installModule resolves
+      // any version spec the hub's registry accepts.
+      await HubService.instance.installModule(source: capability);
+      final caps = await HubService.instance.allCapabilities();
+      final updated = caps
+          .map((c) => '${c.capability}@${c.version}')
+          .toSet()
+          .toList()
+        ..sort();
+      if (mounted) {
+        // Refresh the cached capability future so subsequent
+        // FutureBuilder rebuilds also see the new list.
+        setState(() => _capabilities = Future.value(updated));
+      }
+      return updated;
+    } catch (e) {
+      if (mounted) {
+        ScaffoldMessenger.of(context).removeCurrentSnackBar();
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text('Install failed: $e'),
+            behavior: SnackBarBehavior.floating,
+          ),
+        );
+      }
+      return null;
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     final locale = Localizations.localeOf(context);
@@ -72,6 +110,7 @@ class _FlowsPageState extends State<FlowsPage> {
           locale: editorLocale,
           runDriver: _driver,
           availableCapabilities: caps,
+          onInstallCapability: _onInstallCapability,
         );
       },
     );