fix: cell inspector parses JSON/XML once per text; TLS key chmod is checked; audit write failures are logged

lib/core/security/ssl_certificate_support.dart

@@ -174,9 +174,21 @@ Future<String?> resolveMongoTlsCertificateKeyFile({
   final merged = File('${dir.path}/client.pem');
   await merged.writeAsString('$certBytes\n$keyBytes\n', flush: true);
   if (!Platform.isWindows) {
+    // `Process.run` does not throw on a non-zero exit, so check it: a key
+    // file that stayed at the default mode must not be handed out silently.
     try {
-      await Process.run('chmod', ['600', merged.path]);
-    } catch (_) {}
+      final result = await Process.run('chmod', ['600', merged.path]);
+      if (result.exitCode != 0) {
+        throw FileSystemException(
+          'Could not restrict permissions of the TLS client key file: '
+          '${result.stderr}'.trim(),
+          merged.path,
+        );
+      }
+    } catch (_) {
+      await cleanupMongoTlsTempFile(merged.path);
+      rethrow;
+    }
   }
   return merged.path;
 }

lib/core/storage/local_db.dart

@@ -583,8 +583,9 @@ class LocalDb {
           [kMutationAuditCap],
         );
       }
-    } catch (_) {
-      // Best effort.
+    } catch (e) {
+      // Best effort, but a missing audit trail should not be invisible.
+      debugPrint('LocalDb: could not record a mutation audit entry: $e');
     }
   }
 
@@ -624,8 +625,8 @@ class LocalDb {
         'SELECT id FROM mcp_activity ORDER BY id DESC LIMIT 1 OFFSET ?)',
         [kMcpActivityCap],
       );
-    } catch (_) {
-      // Best effort.
+    } catch (e) {
+      debugPrint('LocalDb: could not record MCP activity: $e');
     }
   }
 

lib/features/workspace/grid_cell_popover_inspector.dart

@@ -169,26 +169,39 @@ class _GridCellInspectorDialogState
     });
   }
 
-  bool _isJson() {
-    final text = _controller.text.trim();
+  // build() asks for both on every rebuild. Parsing a large cell each time
+  // janks, so the answer is kept for the text it was computed for (the
+  // controller hands out the same String until the text changes).
+  String? _kindText;
+  var _kindIsJson = false;
+  var _kindIsXml = false;
+
+  void _refreshKind() {
+    final raw = _controller.text;
+    if (identical(raw, _kindText)) return;
+    _kindText = raw;
+    final text = raw.trim();
+    _kindIsJson = false;
+    _kindIsXml = false;
     if ((text.startsWith('{') && text.endsWith('}')) ||
         (text.startsWith('[') && text.endsWith(']'))) {
       try {
         jsonDecode(text);
-        return true;
-      } catch (_) {
-        return false;
-      }
+        _kindIsJson = true;
+      } catch (_) {}
+    } else if (text.startsWith('<') && text.endsWith('>')) {
+      _kindIsXml = XmlHtmlFormatter.validate(text) == null;
     }
-    return false;
+  }
+
+  bool _isJson() {
+    _refreshKind();
+    return _kindIsJson;
   }
 
   bool _isXml() {
-    final text = _controller.text.trim();
-    if (text.startsWith('<') && text.endsWith('>')) {
-      return XmlHtmlFormatter.validate(text) == null;
-    }
-    return false;
+    _refreshKind();
+    return _kindIsXml;
   }
 
   bool _isHex() {