fix(web): let the tool-row trailing chip truncate instead of covering the title

The right cluster of ToolRow (status dot, chip, time, buttons) was
flex: none, so a long chip such as "Foreground · model · effort" on a
collapsed Task row slid over the row title once the pane got narrow. The
chip now shrinks with an ellipsis and .bh-text clips as a backstop.

Author: elkaix

.changeset/web-preview-header-close.md

@@ -2,4 +2,4 @@
 '@pymodel/pythinker-code': patch
 ---
 
-Keep the file preview close button in the top-right corner at every panel width and remove the unused download action.
+Keep the file preview close button in the top-right corner at every panel width, remove the unused download action, and stop the running-task indicator from overlapping a collapsed Task row title.

apps/pythinker-code/dist-web/.web-bundle-manifest.json

@@ -1,4 +1,4 @@
 {
-  "sourceHash": "7ea5e8fb9bbb40d695d221dccebe6a9c77a67434b48c9ecfff3985148d67e43b",
+  "sourceHash": "6a06c016a761597f70c7b18e0d7368eb8a49d291d67176574af5491181737c3a",
   "sourceFileCount": 405
 }