Update beta message in linear mode (#8106)

This pull request makes a minor update to the user interface text for
Simple Mode. The "beta" label is now more descriptive, clarifying that
Simple Mode is in beta and inviting feedback.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8106-Update-beta-message-in-linear-mode-2ea6d73d3650812193a7cd8f625ea682)
by [Unito](https://www.unito.io)

src/locales/en/main.json

@@ -2496,7 +2496,7 @@
   },
   "linearMode": {
     "linearMode": "Simple Mode",
-    "beta": "Beta - Give Feedback",
+    "beta": "Simple Mode in Beta - Feedback",
     "graphMode": "Graph Mode",
     "dragAndDropImage": "Click to browse or drag an image",
     "runCount": "Run count:",
@@ -2608,4 +2608,4 @@
       "tokenExchangeFailed": "Failed to authenticate with workspace: {error}"
     }
   }
-}
+}