feat: tell test flow conversations from deployed ones and rename a chat (#11179)

* feat: mark test flow conversations apart from deployed ones and allow renaming a chat

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* fix: keep the conversation kind across refreshes and reject NUL titles

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* fix: ignore conversation lists for a kind no longer selected

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* fix: start a fresh conversation listing when the kind changes on a later page

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* fix: refuse sending into a conversation of the other kind

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* fix: refuse cross-kind conversation continuations on the server

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* fix: keep the conversation filter unavailable while an answer runs

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

backend/windmill-api/src/jobs.rs

@@ -9554,6 +9554,8 @@ async fn run_preview_flow_job(
             &run_query,
             user_message.as_ref(),
             uuid,
+            // Run from the editor's test panel: a trial, not a real conversation.
+            true,
         )
         .await?;
     }